In the Direction of an Artificial Intelligence-Enabled Monitoring Platform for Concrete Structures
Anno: 2024
Rivista: SENSORS
Autori/autrici: Cosoli, Gloria; Calcagni, Maria Teresa; Salerno, Giovanni; Mancini, Adriano; Narang, Gagan; Galdelli, Alessandro; Mobili, Alessandra; Tittarelli, Francesca; Revel, Gian Marco
Lingua: ENG
Classificazione IRIS: 1.1 Articolo in rivista
Scheda completa IRIS: https://iris.univpm.it/handle/11566/326185
Citazioni:
In the Direction of an Artificial Intelligence-Enabled Monitoring Platform for Concrete Structures / Cosoli, Gloria; Calcagni, Maria Teresa; Salerno, Giovanni; Mancini, Adriano; Narang, Gagan; Galdelli, Alessandro; Mobili, Alessandra; Tittarelli, Francesca; Revel, Gian Marco. - In: SENSORS. - ISSN 1424-8220. - 24:2(2024). [10.3390/s24020572]
Abstract:
In a seismic context, it is fundamental to deploy distributed sensor networks for Structural Health Monitoring (SHM). Indeed, regularly gathering data from a structure/infrastructure gives insight on the structural health status, and Artificial Intelligence (AI) technologies can help in exploiting t...his information to generate early warnings useful for decision-making purposes. With a perspective of developing a remote monitoring platform for the built environment in a seismic context, the authors tested self-sensing concrete beams in loading tests, focusing on the measured electrical impedance. The formed cracks were objectively assessed through a vision-based system. Also, a comparative analysis of AI-based and statistical prediction methods, including Prophet, ARIMA, and SARIMAX, was conducted for predicting electrical impedance. Results show that the real part of electrical impedance is highly correlated with the applied load (Pearson’s correlation coefficient > 0.9); hence, the piezoresistive ability of the manufactured specimens has been confirmed. Concerning prediction methods, the superiority of the Prophet model over statistical techniques was demonstrated (Mean Absolute Percentage Error, MAPE < 1.00%). Thus, the exploitation of electrical impedance sensors, vision-based systems, and AI technologies can be significant to enhance SHM and maintenance needs prediction in the built environment.
Continua a leggere

A multi-performance comparison between lime, cementitious and alkali-activated TRM systems: Mechanical, environmental and energy perspectives
Anno: 2024
Rivista: CONSTRUCTION AND BUILDING MATERIALS
Autori/autrici: Donnini, J.; Mobili, A.; Maracchini, G.; Chiappini, G.; Tittarelli, F.; Corinaldesi, V.
Lingua: ENG
Classificazione IRIS: 1.1 Articolo in rivista
Scheda completa IRIS: https://iris.univpm.it/handle/11566/333373
Citazioni:
A multi-performance comparison between lime, cementitious and alkali-activated TRM systems: Mechanical, environmental and energy perspectives / Donnini, J.; Mobili, A.; Maracchini, G.; Chiappini, G.; Tittarelli, F.; Corinaldesi, V.. - In: CONSTRUCTION AND BUILDING MATERIALS. - ISSN 0950-0618. - STAMPA. - 440:(2024). [10.1016/j.conbuildmat.2024.137396]
Abstract:
The combined need to propose new solutions for the structural reinforcement of existing buildings and for the reduction of CO2 emissions is leading to the development of more sustainable composite materials, such as those based on alkali-activated mortars (AAM). In this study, different formulations... of AAM, based on metakaolin or fly ash, have been evaluated as possible matrices for Textile Reinforced Mortar (TRM) systems. Two different bidirectional textiles, made of AR glass or basalt fibers, were used as internal reinforcement. The physicalmechanical properties of TRM systems based on AAM were evaluated and compared with those of commercial systems with cementitious or lime-based matrices. Direct tensile tests on TRM coupons and shear bond tests on clay brick substrates were carried out. Then, their energy and environmental-related performance have been compared. Results showed that alkali-activated matrices can be very promising and eco-friendly alternative solutions to traditional mortars in TRM systems.
Continua a leggere

Mechanical strength of alkali activated mortars containing copper mine tailings and metakaolin
Anno: 2023
Autori/autrici: Blasi, E.; Maqbool, Q.; Mobili, A.; Tittarelli, F.
Lingua: ENG
Classificazione IRIS: 4.2 Abstract in Atti di convegno
Scheda completa IRIS: https://iris.univpm.it/handle/11566/312240
Citazioni:
Mechanical strength of alkali activated mortars containing copper mine tailings and metakaolin / Blasi, E.; Maqbool, Q.; Mobili, A.; Tittarelli, F.. - ELETTRONICO. - (2023), pp. 28-28. (Intervento presentato al convegno Convegno Nazionale Italiano sui Geopolimeri tenutosi a Bari nel 16-17 febbraio 2023).

COMPARISON BETWEEN THE USE OF ALKALI-ACTIVATED, LIME-BASED AND CEMENTITIOUS MATRICES FOR FRCM APPLICATIONS
Anno: 2023
Autori/autrici: Donnini, Jacopo; Mobili, Alessandra; Tittarelli, Francesca; Corinaldesi, Valeria
Lingua: ENG
Classificazione IRIS: 4.2 Abstract in Atti di convegno
Scheda completa IRIS: https://iris.univpm.it/handle/11566/317215
Citazioni:
COMPARISON BETWEEN THE USE OF ALKALI-ACTIVATED, LIME-BASED AND CEMENTITIOUS MATRICES FOR FRCM APPLICATIONS / Donnini, Jacopo; Mobili, Alessandra; Tittarelli, Francesca; Corinaldesi, Valeria. - ELETTRONICO. - (2023), pp. 1-2. (Intervento presentato al convegno XVII Convegno Nazionale AIMAT 2023 tenutosi a Catania nel 28 Maggio 1 Giugno 2023).

Development and metrological characterization of cement-based elements with self-sensing capabilities for structural health monitoring purposes
Anno: 2023
Rivista: ACTA IMEKO
Autori/autrici: Cosoli, Gloria; Mobili, Alessandra; Blasi, Elisa; Tittarelli, Francesca; Martarelli, Milena; Revel, Gian Marco
Lingua: ENG
Classificazione IRIS: 1.1 Articolo in rivista
Scheda completa IRIS: https://iris.univpm.it/handle/11566/319071
Citazioni:
Development and metrological characterization of cement-based elements with self-sensing capabilities for structural health monitoring purposes / Cosoli, Gloria; Mobili, Alessandra; Blasi, Elisa; Tittarelli, Francesca; Martarelli, Milena; Revel, Gian Marco. - In: ACTA IMEKO. - ISSN 2221-870X. - STAMPA. - 12:2(2023), pp. 1-12.
Abstract:
Mortar specimens containing conductive additions (i.e., biochar and recycled carbon fibres – both alone and together, and graphene nanoplatelets) were characterized from a metrological point of view. Their piezoresistive capability was evaluated, exploiting the 4-electrode Wenner’s method to mea...sure electrical impedance in alternating current (AC); in this way, both material and electrode-material polarization issues were avoided. The selected mix-design was used to manufacture scaled concrete beams serving as demonstrators. Additionally, FEM-based models were realized for a preliminary analysis of the modal parameters that will be investigated through impact tests conducted after different loading tests, simulating potential seismic effects. The results show that the combined use of recycled carbon fibers and biochar provide the best performance in terms of piezoresistivity (with a sensitivity of 0.109 (μm/m)-1 vs 0.003 (μm/m)-1 of reference mortar). Conductive additions improve the Signal-to-Noise Ratio (SNR) and increase the material electrical conductivity, providing suitable tools to develop a distributed sensor network for Structural Health Monitoring (SHM). Such a monitoring system could be exploited to enhance the resilience of strategic structures and infrastructures towards natural hazards. A homogeneous distribution of conductive additions during casting is fundamental to enhance the measurement repeatability. In fact, both concrete intrinsic properties and curing effect (hydration phenomena, increasing electrical impedance) cause a high variability.
Continua a leggere

Biochar and recycled carbon fibres as additions for low-resistive cement-based composites exposed to accelerated degradation
Anno: 2023
Rivista: CONSTRUCTION AND BUILDING MATERIALS
Autori/autrici: Mobili, A.; Cosoli, G.; Giulietti, N.; Chiariotti, P.; Bellezze, T.; Pandarese, G.; Revel, G. M.; Tittarelli, F.
Lingua: ENG
Classificazione IRIS: 1.1 Articolo in rivista
Scheda completa IRIS: https://iris.univpm.it/handle/11566/312647
Citazioni:
Biochar and recycled carbon fibres as additions for low-resistive cement-based composites exposed to accelerated degradation / Mobili, A.; Cosoli, G.; Giulietti, N.; Chiariotti, P.; Bellezze, T.; Pandarese, G.; Revel, G. M.; Tittarelli, F.. - In: CONSTRUCTION AND BUILDING MATERIALS. - ISSN 0950-0618. - ELETTRONICO. - 376:(2023). [10.1016/j.conbuildmat.2023.131051]
Abstract:
Biochar (BCH) and recycled carbon fibres (RCF) were used as carbonaceous additions in low-resistive mortars/concretes. Their effects on mechanical, electrical, and durability properties were investigated. Tests were performed both during curing and accelerated degradation. The combined use of RCF an...d BCH decreased the electrical impedance of cement-based matrices, enabling the use of low-cost monitoring instrumentation, and improved their mechanical performance. Recycled carbon fibres and biochar additions increased carbonation and capillary water absorption but acting as a barrier they made water and chlorides penetrate less deeply.
Continua a leggere

Commercial and recycled carbon-based fillers and fibers for self-sensing cement-based composites: Comparison of mechanical strength, durability, and piezoresistive behavior
Anno: 2023
Rivista: JOURNAL OF BUILDING ENGINEERING
Autori/autrici: Belli, Alberto; Mobili, Alessandra; Bellezze, Tiziano; Cachim, Paulo B.; Tittarelli, Francesca
Lingua: ENG
Classificazione IRIS: 1.1 Articolo in rivista
Scheda completa IRIS: https://iris.univpm.it/handle/11566/317211
Citazioni:
Commercial and recycled carbon-based fillers and fibers for self-sensing cement-based composites: Comparison of mechanical strength, durability, and piezoresistive behavior / Belli, Alberto; Mobili, Alessandra; Bellezze, Tiziano; Cachim, Paulo B.; Tittarelli, Francesca. - In: JOURNAL OF BUILDING ENGINEERING. - ISSN 2352-7102. - ELETTRONICO. - 73:(2023). [10.1016/j.jobe.2023.106836]
Abstract:
The possible use of industrial by-products as carbon-based fillers and/or fibers to produce Multifunctional Cement-based Composites (MCC) with piezoresistive behavior for Structural Health Monitoring (SHM) was investigated. As fillers, Used Foundry Sand (UFS) and Gasification Char (GCH) were compare...d with commercial Graphene Nanoplatelets (GNP). As fibers, 6 mm long recycled carbon fibers (RCF) were compared with virgin ones. Mortars were tested in terms of mechanical strength, water absorption, microstructure, and piezoresistive behavior. UFS and GCH are more effective than GNP in decreasing the mortar electrical resistivity (− 30%), total porosity (− 11%), water absorption (− 27%) and in increasing the compressive strength (+10%). The combination of UFS with RCF in mortars provides the best results in terms of fluidity, strength, water absorption, and piezoresistive parameters. Generally, a lower mortar resistivity, even if with lower piezoresistivity properties, allows the use of cheaper instrumentation for SHM, thanks to the lower full scale and the better correlation strength between the change in resistivity with strain.
Continua a leggere

A monitoring platform for the built environment: towards the development of an early warning system in a seismic context
Anno: 2023
Autori/autrici: Mancini, Adriano; Violini, Luca; Blasi, Elisa; Cosoli, Gloria; Pandarese, Giuseppe; Tittarelli, Francesca; Mobili, Alessandra; Galdelli, Alessandro; Revel, Gian Marco
Lingua: ENG
Classificazione IRIS: 4.1 Contributo in Atti di convegno
Scheda completa IRIS: https://iris.univpm.it/handle/11566/317213
Citazioni:
A monitoring platform for the built environment: towards the development of an early warning system in a seismic context / Mancini, Adriano; Violini, Luca; Blasi, Elisa; Cosoli, Gloria; Pandarese, Giuseppe; Tittarelli, Francesca; Mobili, Alessandra; Galdelli, Alessandro; Revel, Gian Marco. - (2023), pp. 1-5. (Intervento presentato al convegno 2023 IEEE International Workshop on Metrology for Living Environment tenutosi a Milano nel May 29-31, 2023).
Abstract:
The aim of this paper is to present a monitoring, system for the built environment based on electrical impedance sensors, together with the development of an early warning system to support decision-making processes in a seismic context. In particular, preliminary data were collected on mortar speci...mens embedding stainless-steel electrodes for the periodic measurement of electrical impedance. Hence, these data were exploited to train a Neural Prophet-based deep learning model for the prediction of the electrical impedance module. Indeed, this quantity can provide a lot of information about the health status of the monitored structures. The results can be exploited for the development of an early warning system supporting decision-making strategies for the building management. The model can predict the trend of electrical impedance with acceptable accuracy (MAPE <2%); hence, the monitoring platform can provide information suitable for the development of an early warning system.
Continua a leggere

Damage Identification in Cement-Based Structures: A Method Based on Modal Curvatures and Continuous Wavelet Transform
Anno: 2023
Rivista: SENSORS
Autori/autrici: Cosoli, Gloria; Martarelli, Milena; Mobili, Alessandra; Tittarelli, Francesca; Revel, Gian Marco
Lingua: ENG
Classificazione IRIS: 1.1 Articolo in rivista
Scheda completa IRIS: https://iris.univpm.it/handle/11566/324657
Citazioni:
Damage Identification in Cement-Based Structures: A Method Based on Modal Curvatures and Continuous Wavelet Transform / Cosoli, Gloria; Martarelli, Milena; Mobili, Alessandra; Tittarelli, Francesca; Revel, Gian Marco. - In: SENSORS. - ISSN 1424-8220. - STAMPA. - 23:9292(2023), pp. 1-25. [10.3390/s23229292]
Abstract:
Modal analysis is an effective tool in the context of Structural Health Monitoring (SHM) since the dynamic characteristics of cement-based structures reflect the structural health status of the material itself. The authors consider increasing level load tests on concrete beams and propose a methodol...ogy for damage identification relying on the computation of modal curvatures combined with continuous wavelet transform (CWT) to highlight damage-related changes. Unlike most literature studies, in the present work, no numerical models of the undamaged structure were exploited. Moreover, the authors defined synthetic damage indices depicting the status of a structure. The results show that the I mode shape is the most sensitive to damages; indeed, considering this mode, damages cause a decrease of natural vibration frequency (up to approximately −67%), an increase of loss factor (up to approximately fivefold), and changes in the mode shapes morphology (a cuspid appears). The proposed damage indices are promising, even if the level of damage is not clearly distinguishable, probably because tests were performed after the load removal. Further investigations are needed to scale the methodology to in-field applications.
Continua a leggere

New Materials and Technologies for Durability and Conservation of Building Heritage
Anno: 2023
Rivista: MATERIALS
Autori/autrici: Coppola, Luigi; Bellezze, Tiziano; Belli, Alberto; Bianco, Alessandra; Blasi, Elisa; Cappello, Miriam; Caputo, Domenico; Chougan, Mehdi; Coffetti, Denny; Coppola, Bartolomeo; Corinaldesi, Valeria; D’Amore, Alberto; Daniele, Valeria; Di Maio, Luciano; Di Palma, Luca; Donnini, Jacopo; Ferrara, Giuseppe; Filippi, Sara; Gastaldi, Matteo; Generosi, Nicola; Giosuè, Chiara; Incarnato, Loredana; Lamastra, Francesca; Liguori, Barbara; Macera, Ludovico; Maqbool, Qaisar; Cristina Mascolo, Maria; Mavilia, Letterio; Mazzoli, Alida; Medici, Franco; Mobili, Alessandra; Montesperelli, Giampiero; Pia, Giorgio; Redaelli, Elena; Ruello, Maria Letizia; Scarfato, Paola; Taglieri, Giuliana; Tittarelli, Francesca; Tulliani, Jean-Marc; Valenza, Antonino
Lingua: ENG
Classificazione IRIS: 1.1 Articolo in rivista
Scheda completa IRIS: https://iris.univpm.it/handle/11566/311867
Citazioni:
New Materials and Technologies for Durability and Conservation of Building Heritage / Coppola, Luigi; Bellezze, Tiziano; Belli, Alberto; Bianco, Alessandra; Blasi, Elisa; Cappello, Miriam; Caputo, Domenico; Chougan, Mehdi; Coffetti, Denny; Coppola, Bartolomeo; Corinaldesi, Valeria; D’Amore, Alberto; Daniele, Valeria; Di Maio, Luciano; Di Palma, Luca; Donnini, Jacopo; Ferrara, Giuseppe; Filippi, Sara; Gastaldi, Matteo; Generosi, Nicola; Giosuè, Chiara; Incarnato, Loredana; Lamastra, Francesca; Liguori, Barbara; Macera, Ludovico; Maqbool, Qaisar; Cristina Mascolo, Maria; Mavilia, Letterio; Mazzoli, Alida; Medici, Franco; Mobili, Alessandra; Montesperelli, Giampiero; Pia, Giorgio; Redaelli, Elena; Ruello, Maria Letizia; Scarfato, Paola; Taglieri, Giuliana; Tittarelli, Francesca; Tulliani, Jean-Marc; Valenza, Antonino. - In: MATERIALS. - ISSN 1996-1944. - STAMPA. - 16:1190(2023), pp. 1-19. [10.3390/ma16031190]
Abstract:
The increase in concrete structures’ durability is a milestone to improve the sustainability of buildings and infrastructures. In order to ensure a prolonged service life, it is necessary to detect the deterioration of materials by means of monitoring systems aimed at evaluating not only the penet...ration of aggressive substances into concrete but also the corrosion of carbon-steel reinforcement. Therefore, proper data collection makes it possible to plan suitable restoration works which can be carried out with traditional or innovative techniques and materials. This work focuses on building heritage and it highlights the most recent findings for the conservation and restoration of reinforced concrete structures and masonry buildings.
Continua a leggere

Rehabilitation project of Quang Tri Old Citadel in Vietnam: integrated analytical approach from material characterization to architectural heritage valorization
Anno: 2023
Rivista: JOURNAL OF CULTURAL HERITAGE MANAGEMENT AND SUSTAINABLE DEVELOPMENT
Autori/autrici: Carlorosi, Cecilia; Giosue, Chiara; Anh Le Ngoc, Van; Mobili, Alessandra; Pugnaloni, Fausto; Tittarelli, Francesca
Lingua: ENG
Classificazione IRIS: 1.1 Articolo in rivista
Scheda completa IRIS: https://iris.univpm.it/handle/11566/292810
Citazioni:
Rehabilitation project of Quang Tri Old Citadel in Vietnam: integrated analytical approach from material characterization to architectural heritage valorization / Carlorosi, Cecilia; Giosue, Chiara; Anh Le Ngoc, Van; Mobili, Alessandra; Pugnaloni, Fausto; Tittarelli, Francesca. - In: JOURNAL OF CULTURAL HERITAGE MANAGEMENT AND SUSTAINABLE DEVELOPMENT. - ISSN 2044-1266. - STAMPA. - 13:4(2023), pp. 570-593.
Abstract:
This paper presents the outcomes of the international project “Protecting Landscape Heritage: a requalification project as an instrument for the re-birth of Quang Tri Old Citadel in Vietnam”, achieved with scientific cooperation between the Universita Politecnica delle Marche (Italy) and Hue Uni...versity of Sciences (Vietnam) funded by the Italian Ministry of Foreign Affairs and International Cooperation and Ministry of Science and Technology of Vietnam. The research focuses on the Quang Tri Citadel, founded in 1809 and now in an advanced state of degradation.
Continua a leggere

EVALUATION OF THE METROLOGICAL PERFORMANCE OF SELF-SENSING MORTAR SPECIMENS CONTAINING CARBON-BASED CONDUCTIVE ADDITIONS
Anno: 2022
Autori/autrici: Cosoli, G.; Mobili, A.; Blasi, E.; Tittarelli, F.; Martarelli, M.; Revel, G. M.
Lingua: ENG
Classificazione IRIS: 4.1 Contributo in Atti di convegno
Scheda completa IRIS: https://iris.univpm.it/handle/11566/312241
Citazioni:
EVALUATION OF THE METROLOGICAL PERFORMANCE OF SELF-SENSING MORTAR SPECIMENS CONTAINING CARBON-BASED CONDUCTIVE ADDITIONS / Cosoli, G.; Mobili, A.; Blasi, E.; Tittarelli, F.; Martarelli, M.; Revel, G. M.. - STAMPA. - (2022), pp. 545-554. (Intervento presentato al convegno VI Forum Nazionale delle Misure tenutosi a Brescia nel 15-17 settembre 2022).

Self-sensing mortars with recycled carbon-based fillers and fibers
Anno: 2022
Autori/autrici: Belli, Alberto; Mobili, Alessandra; Bellezze, Tiziano; Cachim, Paulo B.; Tittarelli, Francesca
Lingua: ENG
Classificazione IRIS: 4.1 Contributo in Atti di convegno
Scheda completa IRIS: https://iris.univpm.it/handle/11566/304780
Citazioni:
Self-sensing mortars with recycled carbon-based fillers and fibers / Belli, Alberto; Mobili, Alessandra; Bellezze, Tiziano; Cachim, Paulo B.; Tittarelli, Francesca. - STAMPA. - (2022), pp. 115-131. (Intervento presentato al convegno Fifteenth International conference on Recent Advances in Concrete Technology and Sustainability Issues tenutosi a Milan, Italy nel June 13-15, 2022).
Abstract:
This work investigates the potential of recycled carbon-based materials, obtained from industrial by-products, for the production of Multifunctional Cement-based Composites (MCC) with self-sensing behavior, usable in Structural Health Monitoring (SHM) systems. As recycled materials, Used Foundry San...d (UFS) and Recycled Carbon Fibers (RCF) have been chosen, whereas Graphene Nanoplatelets (GNP) and Virgin Carbon Fibers (VCF) have been selected as reference industrial fillers and fibers, respectively. Their effects on OPC-based mortars have been tested in terms of mechanical strength (compressive, flexural), durability (water absorption), microstructure (porosity), electrical and piezoresistive behavior (resistivity in static and under-load conditions). The results show that the combination of recycled fillers-fibers gives the best results in terms of workability, microstructure, strength, and durability. The worst compressive performances obtained with GNP are related to its hydrophobicity and the related problems in mixing. On the other hand, mixtures with UFS show a low electrical conductivity, but a high sensitivity to deformation (electrical strain-sensing). High-carbon by-products could be a functional, low-cost, and eco-friendly solution to produce high-performance and conductive concretes for self-monitoring systems.
Continua a leggere

Use of gasification char and recycled carbon fibres for sustainable and durable low-resistivity cement-based composites
Anno: 2022
Rivista: JOURNAL OF BUILDING ENGINEERING
Autori/autrici: Mobili, Alessandra; Cosoli, Gloria; Bellezze, Tiziano; Revel, Gian Marco; Tittarelli, Francesca
Lingua: ENG
Classificazione IRIS: 1.1 Articolo in rivista
Scheda completa IRIS: https://iris.univpm.it/handle/11566/295728
Citazioni:
Use of gasification char and recycled carbon fibres for sustainable and durable low-resistivity cement-based composites / Mobili, Alessandra; Cosoli, Gloria; Bellezze, Tiziano; Revel, Gian Marco; Tittarelli, Francesca. - In: JOURNAL OF BUILDING ENGINEERING. - ISSN 2352-7102. - STAMPA. - 50:104237(2022), pp. 1-11.
Abstract:
In this paper, a newly developed cement and two recycled carbon-based materials, namely gasification char (GCH) and recycled carbon fibres (RCF), were used to manufacture new sustainable and low-resistivity cement-based composites. GCH was added at 0.5% and 1.0%, whereas RCF at 0.2%, on the total mo...rtar volume. Microstructural, mechanical, electrical, and durability properties were studied. Results show that both additions decrease the electrical resistivity of mortars up to 90%, without impairing their mechanical properties. Moreover, they slightly reduce drying shrinkage and capillary water absorption of mortars, by decreasing total porosity and the average pore diameter, for the benefit of durability.
Continua a leggere

Cement-Based Composites in Structural Health Monitoring
Anno: 2022
Autori/autrici: Tittarelli, Francesca; Mobili, Alessandra; Chiariotti, Paolo; Cosoli, Gloria; Giulietti, Nicola; Belli, Alberto; Pandarese, Giuseppe; Bellezze, Tiziano; Revel, Gian Marco
Lingua: ENG
Classificazione IRIS: 4.1 Contributo in Atti di convegno
Scheda completa IRIS: https://iris.univpm.it/handle/11566/304781
Citazioni:
Cement-Based Composites in Structural Health Monitoring / Tittarelli, Francesca; Mobili, Alessandra; Chiariotti, Paolo; Cosoli, Gloria; Giulietti, Nicola; Belli, Alberto; Pandarese, Giuseppe; Bellezze, Tiziano; Revel, Gian Marco. - STAMPA. - (2022), pp. 133-149. (Intervento presentato al convegno Fifteenth International conference on Recent Advances in Concrete Technology and Sustainability Issues tenutosi a Milan, Italy nel June 13-15, 2022).
Abstract:
Concrete infrastructures, essential for the economic development of populations, require inspection and maintenance interventions to guarantee their functionality over time. These inspections are typically scheduled on a periodic basis but may not be sufficient to prevent the onset of deteriorations.... When these problems occur, extraordinary maintenance operations shall be carried out, causing inconvenience to users and additional costs to normal management ones. The continuous monitoring of the infrastructures durability allows a paradigm shift in their management, allowing the transition from programmatic maintenance to the implementation of predictive maintenance strategies, with a consequent increase in the safety of the structures as well as a reduction in management costs. This work aims to provide a brief overview of continuous monitoring systems for concrete structures developed by Università Politecnica delle Marche, with particular focus on methods based on free corrosion potential measurement and electrical impedance spectroscopy
Continua a leggere

Effect of Gasification Char and Recycled Carbon Fibres on the Electrical Impedance of Concrete Exposed to Accelerated Degradation
Anno: 2022
Rivista: SUSTAINABILITY
Autori/autrici: Mobili, Alessandra; Cosoli, Gloria; Giulietti, Nicola; Chiariotti, Paolo; Pandarese, Giuseppe; Bellezze, Tiziano; Revel, Gian Marco; Tittarelli, Francesca
Lingua: ENG
Classificazione IRIS: 1.1 Articolo in rivista
Scheda completa IRIS: https://iris.univpm.it/handle/11566/295207
Citazioni:
Effect of Gasification Char and Recycled Carbon Fibres on the Electrical Impedance of Concrete Exposed to Accelerated Degradation / Mobili, Alessandra; Cosoli, Gloria; Giulietti, Nicola; Chiariotti, Paolo; Pandarese, Giuseppe; Bellezze, Tiziano; Revel, Gian Marco; Tittarelli, Francesca. - In: SUSTAINABILITY. - ISSN 2071-1050. - ELETTRONICO. - 14:3(2022). [10.3390/su14031775]
Abstract:
This paper aims to evaluate the effect of carbon-based conductive recycled additions, i.e., recycled carbon fibres (RCF) and gasification char (GCH), on the mechanical, electrical, and durability properties of concretes. The obtained results show that the compressive strength of concrete is not affe...cted by conductive additions, whereas electrical impedance, measured according to Wenner’s method, is significantly reduced (6%, 30% and 74% with RCF, GCH, and their combination, respectively) to the advantage of self-sensing properties. As durability is concerned, conductive additions slightly increase capillary water absorption, whereas they decrease chloride ingress through diffusion and do not significantly modify carbonation resistance.
Continua a leggere

Continuous monitoring of the health status of cement-based structures: electrical impedance measurements and remote monitoring solutions
Anno: 2021
Rivista: ACTA IMEKO
Autori/autrici: Giulietti, Nicola; Chiariotti, Paolo; Cosoli, Gloria; Giacometti, Giovanni; Violini, Luca; Mobili, Alessandra; Pandarese, Giuseppe; Tittarelli, Francesca; Revel, Gian Marco
Classificazione IRIS: 1.1 Articolo in rivista
Scheda completa IRIS: https://iris.univpm.it/handle/11566/294402
Citazioni:
Continuous monitoring of the health status of cement-based structures: electrical impedance measurements and remote monitoring solutions / Giulietti, Nicola; Chiariotti, Paolo; Cosoli, Gloria; Giacometti, Giovanni; Violini, Luca; Mobili, Alessandra; Pandarese, Giuseppe; Tittarelli, Francesca; Revel, Gian Marco. - In: ACTA IMEKO. - ISSN 2221-870X. - STAMPA. - 10:4(22)(2021), pp. 132-139.
Abstract:
The continuous monitoring of cement-based structures and infrastructures is fundamental to optimize their service life and reduce maintenance costs. In the framework of the EnDurCrete project (GA no. 760639), a remote monitoring system based on electrical impedance measurements was developed. Electr...ical impedance is measured according to the Wenner’s method, using 4-electrode arrays embedded in concrete during casting, selecting alternating current as excitation, to avoid the polarization of both electrode/material interface and of material itself. With this measurement, it is possible to promptly identify events related to contaminants ingress or damages (e.g. cracks formation). Conductive additions are included in some elements to enhance signal-to-noise ratio, as well as the self-sensing properties of concrete. Specifically, a distributed sensor network was implemented, consisting of measurement nodes installed in the elements to be monitored, then connected to a central hub (RS-232 protocol). Nodes are realized with an embedded unit for electrical impedance measurements (EVAL-AD5940BIOZ board with AD5940 chip, by Analog Device) and a digital thermometer (DS18B20 by Maxim Integrated), enclosed in cabinets filled with an IP68 gel against moist-related problems. Data are available on a Cloud through Wi-Fi network or LTE modem, hence can be accessed remotely via a use-friendly multi-platform interface.
Continua a leggere

Corrosion behaviour of galvanized steel in cement- and geopolymer-based concrete: a review on scientific work at the Polytechnic University of Marche
Anno: 2021
Autori/autrici: Bellezze, Tiziano; Mobili, Alessandra; Tittarelli, Francesca
Lingua: ENG
Classificazione IRIS: 4.2 Abstract in Atti di convegno
Scheda completa IRIS: https://iris.univpm.it/handle/11566/290023
Citazioni:
Corrosion behaviour of galvanized steel in cement- and geopolymer-based concrete: a review on scientific work at the Polytechnic University of Marche / Bellezze, Tiziano; Mobili, Alessandra; Tittarelli, Francesca. - ELETTRONICO. - BOOK OF ABSTRACT of EM4SS’21, Engineered Materials for Sustainable Structures:(2021), pp. 91-91. (Intervento presentato al convegno EM4SS’21, Engineered Materials for Sustainable Structures tenutosi a Modena (ONLINE) nel 26-28 April 2021).
Abstract:
Hot-dip galvanized steel rebars are effective to increase the durability of reinforced construction materials, based on traditional cement and on recently studied alkali-activated binders, such as geopolymers. Instead of steel reinforcements, galvanized reinforcements in concrete are protected by ca...lcium hydroxyzincate (CaHZn) layer, which, under carbonation, transforms into a less protective hydrozincite (HZ), but corrosion resistant layer. In the case of chlorides ingress, the threshold for localized corrosion initiation is at least three times higher for galvanized rebars than for steel rebars: 1.3 wt% vs 0.4 wt%, respectively, with respect to the weight of cement. Therefore, galvanized rebars increase considerably the durability of reinforced concrete structures, without significantly impairing construction costs. Concerning geopolymers, the matrix is more alkaline than the traditional cementitious ones and the scarce presence of calcium ions cannot guarantee the protection of galvanized steel by CaHZn. Actually, also in these conditions, galvanized steel passivates even if with a certain delay (4-7 days) from the cast, by the formation of ZnO passive layer. In particular, geopolymers obtained by fly ash slow the ingress of chlorides, protecting the reinforcements, if galvanized, from a penetrating localized corrosion of Zn-Fe alloys.
Continua a leggere

Gasification Char and Used Foundry Sand as Alternative Fillers to Graphene Nanoplatelets for Electrically Conductive Mortars with and without Virgin/Recycled Carbon Fibres
Anno: 2021
Rivista: APPLIED SCIENCES
Autori/autrici: Mobili, Alessandra; Giosue', Chiara; Bellezze, Tiziano; Revel, Gian Marco; Tittarelli, Francesca
Lingua: ENG
Classificazione IRIS: 1.1 Articolo in rivista
Scheda completa IRIS: https://iris.univpm.it/handle/11566/286345
Citazioni:
Gasification Char and Used Foundry Sand as Alternative Fillers to Graphene Nanoplatelets for Electrically Conductive Mortars with and without Virgin/Recycled Carbon Fibres / Mobili, Alessandra; Giosue', Chiara; Bellezze, Tiziano; Revel, Gian Marco; Tittarelli, Francesca. - In: APPLIED SCIENCES. - ISSN 2076-3417. - ELETTRONICO. - 11:50(2021), pp. 1-16. [10.3390/app11010050]
Abstract:
Structural health monitoring to assess the safety, durability and performance of structures can be performed by non-destructive methods such as the measurement of impedance in self-sensing cement-based elements. Cement-based materials, like mortars and concretes, generally have high electrical re...sistivity but the addition of carbon-based fillers and fibres decreases their electrical resistivity and thus enhances their self-sensing capabilities. In this study, two waste carbon-based fillers, namely, used foundry sand and gasification char were compared to commercial graphene nanoplatelets and used to produce self-sensing cement mortars, both with and without recycled or virgin carbon fibres. The mortars were tested in terms of their mechanical and electrical properties as well as their propensity to capillary water absorption. The results demonstrate that gasification char alone is the best carbonaceous waste for decreasing the electrical resistivity (-42%) and water absorption (-17%) of mortars, while their compressive strength remains unaltered. Moreover, although there is a slight reduction in compressive strength and an increase in water suction when gasification char is coupled with fibres, the combination of fillers and fibres has a synergistic effect in decreasing mortars’ electrical resistivity, especially when recycled carbon fibres are used (-80%).
Continua a leggere

Durability benefits of galvanized steel in reinforced concrete under different exposure conditions
Anno: 2021
Autori/autrici: Bellezze, Tiziano; Mobili, Alessandra; Tittarelli, Francesca
Lingua: ENG
Classificazione IRIS: 4.1 Contributo in Atti di convegno
Scheda completa IRIS: https://iris.univpm.it/handle/11566/294887
Citazioni:
Durability benefits of galvanized steel in reinforced concrete under different exposure conditions / Bellezze, Tiziano; Mobili, Alessandra; Tittarelli, Francesca. - ELETTRONICO. - Proceedings of the the fib CACRCS DAYS 2021 “Capacity Assessment of Corroded Reinforced Concrete Structure”:(2021), pp. 45-48. (Intervento presentato al convegno CACRCS DAYS 2021 tenutosi a ON-LINE nel 30 November – 3 December 2021).
Abstract:
This paper is a short review of the work performed for many years at the Polytechnic University of Marche on the use of hot-dip galvanized steel rebars in reinforced concrete, for increasing its durability without significantly impairing the installation costs. Corrosion research was done in traditi...onal cementitious matrixes and in geopolymeric ones. Compared to black steel rebars, these studies clearly show that passivation of galvanized steel ones plays a key role on their protection, when exposed to severe conditions: contamination of chlorides (higher concentration thresholds before the onset of localized corrosion) and/or carbonation (formation of a new passive layer).
Continua a leggere

Mechanical, durability, depolluting and electrical properties of multifunctional mortars prepared with commercial or waste carbon-based fillers
Anno: 2021
Rivista: CONSTRUCTION AND BUILDING MATERIALS
Autori/autrici: Mobili, Alessandra; Belli, Alberto; Giosue', Chiara; Pierpaoli, Mattia; Bastianelli, Luca; Mazzoli, Alida; Ruello, Maria Letizia; Bellezze, Tiziano; Tittarelli, Francesca
Lingua: ENG
Classificazione IRIS: 1.1 Articolo in rivista
Scheda completa IRIS: https://iris.univpm.it/handle/11566/288423
Citazioni:
Mechanical, durability, depolluting and electrical properties of multifunctional mortars prepared with commercial or waste carbon-based fillers / Mobili, Alessandra; Belli, Alberto; Giosue', Chiara; Pierpaoli, Mattia; Bastianelli, Luca; Mazzoli, Alida; Ruello, Maria Letizia; Bellezze, Tiziano; Tittarelli, Francesca. - In: CONSTRUCTION AND BUILDING MATERIALS. - ISSN 0950-0618. - STAMPA. - 283:122768(2021), pp. 1-16.
Abstract:
Carbon-based fillers from industrial wastes and commercial ones were compared to improve the properties of lime-based mixes. As commercial fillers, graphene nanoplatelets and activated carbon were used, whereas as industrial wastes a char obtained by the gasification of biomasses and a used foundry ...sand were chosen. Carbon-based wastes were found to be a good cost-effective alternative to commercial carbon based fillers to increase the compressive strength (of about 25%) and to reduce water capillary absorption (of about 50%) thanks to the paste refinement; to enhance depollution capacity (of about 25%) and increase both electrical conductivity (up to 65%) and electromagnetic shielding effectiveness (of about 6%) of the hardened compounds thanks to the carbon content.
Continua a leggere

Automated measurement system for detecting carbonation depth: Image-processing based technique applied to concrete sprayed with phenolphthalein
Anno: 2021
Rivista: MEASUREMENT
Autori/autrici: Giulietti, N.; Chiariotti, P.; Cosoli, G.; Mobili, A.; Pandarese, G.; Tittarelli, F.; Revel, G. M.
Lingua: ENG
Classificazione IRIS: 1.1 Articolo in rivista
Scheda completa IRIS: https://iris.univpm.it/handle/11566/287929
Citazioni:
Automated measurement system for detecting carbonation depth: Image-processing based technique applied to concrete sprayed with phenolphthalein / Giulietti, N.; Chiariotti, P.; Cosoli, G.; Mobili, A.; Pandarese, G.; Tittarelli, F.; Revel, G. M.. - In: MEASUREMENT. - ISSN 0263-2241. - STAMPA. - 175:109142(2021), pp. 1-8. [10.1016/j.measurement.2021.109142]
Abstract:
This paper aims at discussing an automated measurement system for detecting carbonation depth in concrete sprayed with phenolphthalein. Image processing and Convolutional Neural Networks strategies are exploited to accurately separate the carbonated and non-carbonated areas and to remove those aggre...gates on the carbonation front that could bring to a wrong evaluation of the carbonation depth. Very strong correlation (R2 = 0.96) is found between results provided by the proposed approach and the method suggested by the EN 13295 standard. The expanded uncertainty (coverage factor k = 2) of this novel approach is 0.08 mm. ANOVA analysis performed in multi-operator tests proved that the highest source of uncertainty is the measurement system, which, on the other hand, is robust to changes in the operator performing the measurement.
Continua a leggere

Sistemi innovativi per il monitoraggio della durabilità delle infrastrutture
Anno: 2020
Rivista: INGENIO
Autori/autrici: Tittarelli, Francesca; Chiariotti, Paolo; Mobili, Alessandra; Cosoli, Gloria; Giulietti, Nicola; Pandarese, Giuseppe; Bellezze, Tiziano; Revel, Gian Marco
Lingua: ITA
Classificazione IRIS: 1.1 Articolo in rivista
Scheda completa IRIS: https://iris.univpm.it/handle/11566/285565
Citazioni:
Sistemi innovativi per il monitoraggio della durabilità delle infrastrutture / Tittarelli, Francesca; Chiariotti, Paolo; Mobili, Alessandra; Cosoli, Gloria; Giulietti, Nicola; Pandarese, Giuseppe; Bellezze, Tiziano; Revel, Gian Marco. - In: INGENIO. - ISSN 2307-8928. - ELETTRONICO. - https://www.ingenio-web.it/28558-sistemi-innovativi-per-il-monitoraggio-continuo-della-durabilita-delle-infrastrutture-in-calcestruzzo:28558(2020).
Abstract:
Le infrastrutture in calcestruzzo costituiscono uno dei punti cardine per lo sviluppo economico delle popolazioni. Tuttavia, esse richiedono interventi di ispezione e manutenzione che ne garantiscano la funzionalità nel tempo. Tali ispezioni sono tipicamente programmate con cadenze periodiche, ma p...ossono non essere sufficienti a prevenire l’insorgere di problemi legati alla loro durabilità. Quando questi si verificano occorre infatti eseguire interventi di manutenzione straordinaria che comportano disagi per gli utenti e costituiscono una voce di costo aggiuntiva rispetto ai normali costi di gestione. Il monitoraggio continuo della durabilità delle infrastrutture permette un cambio di paradigma nella loro gestione, consentendo il passaggio da una manutenzione programmatica all’attuazione di strategie di manutenzione predittiva, con un conseguente incremento della sicurezza della struttura nonché una riduzione dei costi di gestione. Questo lavoro ha come obbiettivo quello di fornire una breve panoramica sui sistemi di monitoraggio della durabilità di strutture in calcestruzzo armato sviluppati dall’Università Politecnica delle Marche, con particolare focus sui metodi di misura del potenziale di libera corrosione e della spettroscopia di impedenza elettrochimica.
Continua a leggere

Comportamento a corrosione di armature in acciaio e acciaio zincato in una malta ad attivazione alcalina a base di metacaolino dopo carbonatazione accelerata
Anno: 2020
Rivista: LA METALLURGIA ITALIANA
Autori/autrici: Mobili, A.; Giosuè, C.; Bellezze, T.; Tittarelli, F.
Lingua: ENG
Classificazione IRIS: 1.1 Articolo in rivista
Scheda completa IRIS: https://iris.univpm.it/handle/11566/280364
Citazioni:
Comportamento a corrosione di armature in acciaio e acciaio zincato in una malta ad attivazione alcalina a base di metacaolino dopo carbonatazione accelerata / Mobili, A.; Giosuè, C.; Bellezze, T.; Tittarelli, F.. - In: LA METALLURGIA ITALIANA. - ISSN 0026-0843. - STAMPA. - 04:(2020), pp. 22-26.
Abstract:
Il lavoro presenta il comportamento a corrosione di armature in acciaio e acciaio zincato immerse in malte ad attivazione alcalina a base di metacaolino e malte tradizionali cementizie appartenenti alla stessa classe di resistenza meccanica (classe R3 con Rc ≥ 25 MPa, secondo la UNI EN 1504-3). ...I test sono stati effettuati valutando il potenziale di libera corrosione e la resistenza alla polarizzazione durante il primo mese di stagionatura e durante i successivi cicli settimanali di bagnasciuga in acqua dopo esposizione in camera al 3% di CO2. Durante la stagionatura, l’elevato pH della malta in metacaolino rallenta il raggiungimento dello stato passivo delle armature zincate che, successivamente, raggiungono resistenze di polarizzazione paragonabili alle barre immerse nella malta cementizia. Durante carbonatazione accelerata, il pH della malta in metacaolino si abbassa più velocemente di quello della malta cementizia. Durante i cicli di bagnasciuga, entrambe le tipologie di armatura mostrano simili resistenze alla polarizzazione in entrambe le matrici studiate.
Continua a leggere

Multifunctional Lightweight Mortars for Indoor Applications to Improve Comfort and Health of Occupants: Thermal Properties and Photocatalytic Efficiency
Anno: 2020
Rivista: FRONTIERS IN MATERIALS
Autori/autrici: Giosue, Chiara; Pierpaoli, Mattia; Mobili, Alessandra; Ruello, Maria Letizia; Tittarelli, Francesca
Lingua: ENG
Classificazione IRIS: 1.1 Articolo in rivista
Scheda completa IRIS: https://iris.univpm.it/handle/11566/283721
Citazioni:
Multifunctional Lightweight Mortars for Indoor Applications to Improve Comfort and Health of Occupants: Thermal Properties and Photocatalytic Efficiency / Giosue, Chiara; Pierpaoli, Mattia; Mobili, Alessandra; Ruello, Maria Letizia; Tittarelli, Francesca. - In: FRONTIERS IN MATERIALS. - ISSN 2296-8016. - ELETTRONICO. - 7:(2020). [10.3389/fmats.2020.00255]
Abstract:
A new generation of smart building materials, able to passively improve the indoor environment and the comfort of occupants owing to their interaction with the surrounding environment, can be addressed. This paper investigates the use of three highly porous aggregates to manufacture hydraulic lime-b...ased multifunctional mortars to be used as indoor finishes. The same water/binder ratio was used for each mortar mix, and conventional calcareous sand was totally replaced by volume with zeolite, silica gel, and activated carbon. Nanosized titanium dioxide (TiO2) was added to award a photocatalytic behavior under UV radiation to the mortars. Results show that, as expected, when highly porous aggregates are used, mortars absorb more water by capillary suction. However, even though the mortars manufactured with lightweight aggregates have a lower density, the mechanical behavior of zeolite and activated carbon mortars is comparable or even higher than that of sand mortars, thanks to an optimum interfacial transition zone (ITZ) between the binder paste and the aggregate. The photocatalytic activity, in terms of photocatalytic NOx degradation efficiency and selectivity of unwanted produced NO2, results to be optimal when silica gel-based mortar is tested. Additionally, the thermal-insulation properties are enhanced up to 40% by using all the unconventional aggregates.
Continua a leggere

Durability Assessment of Recycled Aggregate HVFA Concrete
Anno: 2020
Rivista: APPLIED SCIENCES
Autori/autrici: Corinaldesi, Valeria; Donnini, Jacopo; Giosue', Chiara; Mobili, Alessandra; Tittarelli, Francesca
Lingua: ENG
Classificazione IRIS: 1.1 Articolo in rivista
Scheda completa IRIS: https://iris.univpm.it/handle/11566/283988
Citazioni:
Durability Assessment of Recycled Aggregate HVFA Concrete / Corinaldesi, Valeria; Donnini, Jacopo; Giosue', Chiara; Mobili, Alessandra; Tittarelli, Francesca. - In: APPLIED SCIENCES. - ISSN 2076-3417. - ELETTRONICO. - 10:6454(2020), pp. 1-14. [10.3390/app10186454]
Abstract:
The possibility of producing high-volume fly ash (HVFA) recycled aggregate concrete represents an important step towards the development of sustainable building materials. In fact, there is a growing need to reduce the use of non-renewable natural resources and, at the same time, to valorize indu...strial by-products, such as fly ash, that would otherwise be sent to the landfill. The present experimental work investigates the physical and mechanical properties of concrete by replacing natural aggregates and cement with recycled aggregates and fly ash, respectively. First, the mechanical properties of four dierent mixtures have been analyzed and compared. Then, the eectiveness of recycled aggregate and fly ash on reducing carbonation and chloride penetration depth has been also evaluated. Finally, the corrosion behavior of the dierent concrete mixtures, reinforced with either bare or galvanized steel plates, has been evaluated. The results obtained show that high-volume fly ash (HVFA) recycled aggregate concrete can be produced without significative reduction in mechanical properties. Furthermore, the addition of high-volume fly ash and the total replacement of natural aggregates with recycled ones did not modify the corrosion behavior of embedded bare and galvanized steel reinforcement.
Continua a leggere

Innovative hydraulic lime-based finishes with unconventional aggregates and TiO2 for the improvement of indoor air quality
Anno: 2020
Rivista: MANUFACTURING REVIEW
Autori/autrici: Giosue', Chiara; Mobili, Alessandra; Citterio, Barbara; Biavasco, Francesca; Ruello, Maria Letizia; Tittarelli, Francesca
Lingua: ENG
Classificazione IRIS: 1.1 Articolo in rivista
Scheda completa IRIS: https://iris.univpm.it/handle/11566/276217
Citazioni:
Innovative hydraulic lime-based finishes with unconventional aggregates and TiO2 for the improvement of indoor air quality / Giosue', Chiara; Mobili, Alessandra; Citterio, Barbara; Biavasco, Francesca; Ruello, Maria Letizia; Tittarelli, Francesca. - In: MANUFACTURING REVIEW. - ISSN 2265-4224. - ELETTRONICO. - 7:(2020). [10.1051/mfreview/2020010]

Electrical Resistivity and Electrical Impedance Measurement in Mortar and Concrete Elements: A Systematic Review
Anno: 2020
Rivista: APPLIED SCIENCES
Autori/autrici: Cosoli, Gloria; Mobili, Alessandra; Tittarelli, Francesca; Revel, Gian Marco; Chiariotti, Paolo
Lingua: ENG
Classificazione IRIS: 1.1 Articolo in rivista
Scheda completa IRIS: https://iris.univpm.it/handle/11566/286344
Citazioni:
Electrical Resistivity and Electrical Impedance Measurement in Mortar and Concrete Elements: A Systematic Review / Cosoli, Gloria; Mobili, Alessandra; Tittarelli, Francesca; Revel, Gian Marco; Chiariotti, Paolo. - In: APPLIED SCIENCES. - ISSN 2076-3417. - ELETTRONICO. - 10:9152(2020), pp. 1-42. [10.3390/app10249152]
Abstract:
This paper aims at analyzing the state-of-the-art techniques to measure electrical impedance (and, consequently, electrical resistivity) of mortar/concrete elements. Despite the validity of the concept being widely proven in the literature, a clear standard for this measurement is still missing. Die...rent methods are described and discussed, highlighting pros and cons with respect to their performance, reliability, and degree of maturity. Both monitoring and inspection approaches are possible by using electrical resistivity measurements; since electrical resistivity is an important indicator of the health status of mortar/concrete, as it changes whenever phenomena modifying the conductivity of mortar/concrete (e.g., degradation or attacks by external agents) occur, this review aims to serve as a guide for those interested in this type of measurements.
Continua a leggere

One-Part Alkali-Activated Pastes and Mortars Prepared with Metakaolin and Biomass Ash
Anno: 2020
Rivista: APPLIED SCIENCES
Autori/autrici: Mobili, Alessandra; Tittarelli, Francesca; Rahier, Hubert
Lingua: ENG
Classificazione IRIS: 1.1 Articolo in rivista
Scheda completa IRIS: https://iris.univpm.it/handle/11566/283722
Citazioni:
One-Part Alkali-Activated Pastes and Mortars Prepared with Metakaolin and Biomass Ash / Mobili, Alessandra; Tittarelli, Francesca; Rahier, Hubert. - In: APPLIED SCIENCES. - ISSN 2076-3417. - ELETTRONICO. - 10:5610(2020), pp. 1-14. [10.3390/app10165610]
Abstract:
Common alkali-activated materials (AAMs) are usually manufactured with highly alkaline solutions. However, alkaline solutions are dangerous for workers who must wear gloves, masks, and glasses when handling them. This issue makes common (or two-part) AAMs not user-friendly and problematic for bulk p...roduction if no safety procedures are followed. In this paper, the possibility of manufacturing alkali-activated pastes and mortars without alkaline solution is investigated. These innovative one-partAAMshave been prepared with metakaolin as the aluminosilicate precursor, potassium-rich biomass ash as the alkaline activator, and water. AAMs have been prepared by varying the K/Al molar ratio: pastes have been studied in terms of reaction kinetics, through isothermal calorimetry, and mortars have been tested in terms of mechanical compressive strength. Results show that the K/Al molar ratio governs both the reaction kinetics and the mechanical strength of these innovative materials. The highest compressive strength is obtained when the K/Al ratio is equal to 2.5 and the water/solid ratio is equal to 0.49. If biomass ash is heated at 700 C to decompose the calcium carbonate, its reactivity and the final compressive strength increase.
Continua a leggere

Commercial and recycled carbon/steel fibers for fiber-reinforced cement mortars with high electrical conductivity
Anno: 2020
Rivista: CEMENT & CONCRETE COMPOSITES
Autori/autrici: Belli, Alberto; Mobili, Alessandra; Bellezze, Tiziano; Tittarelli, Francesca
Lingua: ENG
Classificazione IRIS: 1.1 Articolo in rivista
Scheda completa IRIS: https://iris.univpm.it/handle/11566/275078
Citazioni:
Commercial and recycled carbon/steel fibers for fiber-reinforced cement mortars with high electrical conductivity / Belli, Alberto; Mobili, Alessandra; Bellezze, Tiziano; Tittarelli, Francesca. - In: CEMENT & CONCRETE COMPOSITES. - ISSN 0958-9465. - STAMPA. - 109:(2020). [10.1016/j.cemconcomp.2020.103569]
Abstract:
The paper aims to provide a comprehensive study on the compositional optimization of high-conductive multifunctional fiber-reinforced cement mortars (FRCMs). Therefore, the effects of three different fiber types: virgin carbon fibers (VCFs), recycled carbon fibers (RCFs), and brass-plated steel fibe...rs (BSFs), added at a broad range of concentrations, as 0.05%, 0.1%, 0.2%, 0.4%, 0.8%, 1.2%, and 1.6% by volume, on the mechanical, electrical and durability properties of FRCMs have been compared. The results showed that RCFs increase the flexural and tensile splitting strength up to 100%, whereas BSFs improve the compressive strength by 38%. Moreover, the fibers decrease both the capillary water absorption and the drying shrinkage by 39%. Electrical conductivity tests show that RCFs decrease the electrical resistivity of mortars up to one order of magnitude, in addition to a percolation threshold between 0.1 and 0.2 vol%.
Continua a leggere

Calcium sulfoaluminate and alkali-activated fly ash cements as alternative to Portland cement: study on chemical, physical-mechanical, and durability properties of mortars with the same strength class
Anno: 2020
Rivista: CONSTRUCTION AND BUILDING MATERIALS
Autori/autrici: Mobili, Alessandra; Telesca, Antonio; Marroccoli, Milena; Tittarelli, Francesca
Lingua: ENG
Classificazione IRIS: 1.1 Articolo in rivista
Scheda completa IRIS: https://iris.univpm.it/handle/11566/274923
Citazioni:
Calcium sulfoaluminate and alkali-activated fly ash cements as alternative to Portland cement: study on chemical, physical-mechanical, and durability properties of mortars with the same strength class / Mobili, Alessandra; Telesca, Antonio; Marroccoli, Milena; Tittarelli, Francesca. - In: CONSTRUCTION AND BUILDING MATERIALS. - ISSN 0950-0618. - 246:118436(2020), pp. 1-16. [10.1016/j.conbuildmat.2020.118436]
Abstract:
There is an increasing interest towards the development of alternative binders for the manufacture of sustainable mortars and concretes. Ordinary Portland cement (OPC) is the most commonly used material in construction, even if its production process is highly polluting. Both calcium sulfoaluminate ...(CSA) and alkali-activated cements (AAC) are potential alternative binders to be used in both structural (R3 class, with Rc " 25 MPa) and non-structural applications (R1 and R2 classes, with Rc " 10 MPa and Rc " 15 MPa, respectively) according to UNI EN 1504-3. This paper reports the hydration mechanisms and the evolution of porosity of OPC-, CSA- and AAC-based binders. The properties of fresh and hardened mortars, belonging to the above-mentioned mechanical strength classes, were evaluated and compared with particular emphasis on durability properties in terms of capillary water absorption, drying shrinkage, and resistance to sulfate attack. The results show that CSA-based mortars exhibit the lowest drying shrinkage due to their highest elasticity modulus. AAC mortars are characterized by the highest water vapor permeability and the lowest capillary water absorption for the highest presence of large pores (>3000 nm).
Continua a leggere

Behavior of Cement-Based Alkali-Activated Lightweight Mortars at High Temperatures
Anno: 2019
Autori/autrici: Giosuè, C.; Mobili, A.; Tittarelli, F.
Lingua: ENG
Classificazione IRIS: 4.1 Contributo in Atti di convegno
Scheda completa IRIS: https://iris.univpm.it/handle/11566/269948
Citazioni:
Behavior of Cement-Based Alkali-Activated Lightweight Mortars at High Temperatures / Giosuè, C.; Mobili, A.; Tittarelli, F.. - ELETTRONICO. - (2019), pp. 53-62. (Intervento presentato al convegno 5th ACI Italy Chapter Workshop on The New Boundaries of Structural Concrete 2019 tenutosi a Milan nel September 19-20, 2019).
Abstract:
Six lightweight cement-based or alkali-activated mortars are investigated after being exposed to 500, 750, and 1000 °C. In the three cement-based mortars, the binder is Portland cement, with/without fly ash or metakaolin, while in the remaining three alkali-activated mortars (all devoid of Portl...and cement), different combinations of fly ash and metakaolin are investigated. Replacing 40% of the cement with metakaolin and replacing 50% of metakaolin with coal fly ash enhance the resistance to high temperatures of the mortars. After the exposure to 1000 °C, the high residual compressive strength of cement-based mortars containing metakaolin comes from the formation of new crystalline phases, whereas in alkali-activated mortars the high residual compressive strength comes from their high densification.
Continua a leggere

HIGH-TEMPERATURE PERFORMANCE OF CEMENTITIOUS AND ALKALI ACTIVATED LIGHTWEIGHT MORTARS
Anno: 2019
Autori/autrici: Giosuè, C.; Mobili, A.; Tittarelli, F.
Lingua: ENG
Classificazione IRIS: 4.2 Abstract in Atti di convegno
Scheda completa IRIS: https://iris.univpm.it/handle/11566/269308
Citazioni:
HIGH-TEMPERATURE PERFORMANCE OF CEMENTITIOUS AND ALKALI ACTIVATED LIGHTWEIGHT MORTARS / Giosuè, C.; Mobili, A.; Tittarelli, F.. - ELETTRONICO. - (2019), pp. 1-1. (Intervento presentato al convegno XV CONVEGNO NAZIONALE AIMAT XII CONVEGNO INSTM SULLA SCIENZA E TECNOLOGIA DEI MATERIALI tenutosi a ISCHIA PORTO nel 21st—24th JULY 2019).

Comportamento a corrosione di armature in acciaio e acciaio zincato in una malta ad attivazione alcalina a base di metacaolino dopo carbonatazione accelerata
Anno: 2019
Autori/autrici: Mobili, A.; Giosuè, C.; Bellezze, T.; Tittarelli, F.
Lingua: ITA
Classificazione IRIS: 4.1 Contributo in Atti di convegno
Scheda completa IRIS: https://iris.univpm.it/handle/11566/271226
Citazioni:
Comportamento a corrosione di armature in acciaio e acciaio zincato in una malta ad attivazione alcalina a base di metacaolino dopo carbonatazione accelerata / Mobili, A.; Giosuè, C.; Bellezze, T.; Tittarelli, F.. - ELETTRONICO. - (2019), pp. 1-4. (Intervento presentato al convegno XIII edizione delle Giornate Nazionali sulla Corrosione e Protezione tenutosi a Campus dell’Università degli Studi di Palermo nel 3-5 luglio 2019).
Abstract:
The work presents the corrosion behavior of bare and galvanized steel rebars embedded in metakaolin alkali-activated mortar and traditional cement-based mortar belonging to the same mechanical strength class (R3 class with Rc ≥ 25 MPa, according to UNI EN 1504-3). Tests were conducted evaluating b...oth the corrosion potential and the polarization resistance throughout the first month of curing and during the subsequent weekly wet/dry cycles in tap water after exposure to a chamber with 3% of CO2. During the first month, the high alkalinity of alkali-activated mortar delays the achievement of the passive state in particular for galvanized steel rebars, even though, after that period, they reach the same polarization resistance of those embedded in the cement-based mortar. During accelerated carbonation, the neutralization of alkalinity in alkali-activated mortar occurs more quickly than in cement-based mortar. During exposure to wet/dry cycles in tap water, both bare and galvanized steel rebars show comparable polarization resistance values in both studied mortars.
Continua a leggere

CARBON-BASED FILLERS AND FIBERS FOR ELECTRICALLY CONDUCTIVE CEMENT MORTARS
Anno: 2019
Autori/autrici: Mobili, A.; Bellezze, T.; Revel, Gm; Tittarelli, F.
Classificazione IRIS: 4.2 Abstract in Atti di convegno
Scheda completa IRIS: https://iris.univpm.it/handle/11566/269307
Citazioni:
CARBON-BASED FILLERS AND FIBERS FOR ELECTRICALLY CONDUCTIVE CEMENT MORTARS / Mobili, A.; Bellezze, T.; Revel, Gm; Tittarelli, F.. - ELETTRONICO. - (2019), pp. 1-1.

Calcium Sulfoaluminate Cement and Fly Ash-Based Geopolymer as Sustainable Binders for Mortars
Anno: 2019
Rivista: CHEMICAL ENGINEERING TRANSACTIONS
Autori/autrici: Telesca, Antonio; Mobili, Alessandra; Tittarelli, Francesca; Marroccoli, Milena
Lingua: ENG
Classificazione IRIS: 1.1 Articolo in rivista
Scheda completa IRIS: https://iris.univpm.it/handle/11566/267325
Citazioni:
Calcium Sulfoaluminate Cement and Fly Ash-Based Geopolymer as Sustainable Binders for Mortars / Telesca, Antonio; Mobili, Alessandra; Tittarelli, Francesca; Marroccoli, Milena. - In: CHEMICAL ENGINEERING TRANSACTIONS. - ISSN 2283-9216. - STAMPA. - 74:(2019), pp. 1249-1254. [10.3303/CET1974209]
Abstract:
This work investigates the hydration behaviour and the physico-mechanical properties of mortars based on calcium sulfoaluminate (CSA) cements and fly ash-based geopolymers (GEO) as alternatives to ordinary Portland cement. According to the EN 1504-3, mortars were prepared in order to reach three com...pressive strength classes, namely R1, R2 and R3 (R1 with Rc ≥ 10 MPa, R2 with Rc ≥ 15 MPa and R3 with Rc ≥ 25 MPa). CSA mortars were prepared by using sulfoaluminate cement alone (R3) or in mixture with a limestone filler (R1 and R2); GEO mortars were manufactured by alkali-activation of coal fly ash and calcium aluminate cement with a sodium silicate and potassium hydroxide water solution. The hydration behaviour was evaluated on pastes submitted to differential thermal-thermogravimetric and X-ray diffraction analyses. Mortars was analysed through mercury intrusion porosimetry; their mechanical properties were evaluated in terms of compressive strength and dynamic modulus of elasticity. Furthermore, capillary water absorption and drying shrinkage tests were carried out in order to evaluate their durability. Due to the rapid ettringite formation, CSA-based mixtures reached their maximum compressive strength values faster than the corresponding GEO mortars. Results showed that the lower modulus of elasticity of GEO mortars causes the higher drying shrinkage. Moreover, the lower porosity exhibited by GEO mortars was responsible for the lower water capillary absorption.
Continua a leggere

Piezoresistive behaviour of mortars loaded with graphene and carbon fibers for the development of self-sensing composites
Anno: 2019
Autori/autrici: Belli, A.; Mobili, A.; Bellezze, T.; Tittarelli, F.; Cachim, P. B.
Lingua: ENG
Classificazione IRIS: 4.1 Contributo in Atti di convegno
Scheda completa IRIS: https://iris.univpm.it/handle/11566/264704
Citazioni:
Piezoresistive behaviour of mortars loaded with graphene and carbon fibers for the development of self-sensing composites / Belli, A.; Mobili, A.; Bellezze, T.; Tittarelli, F.; Cachim, P. B.. - (2019), pp. 37-42.
Abstract:
In recent years, infrastructures have become of primary importance for society and for the economic development. This led to the introduction of monitoring systems for their protec-tion, and for an eco-friendly saving of resources for their maintenance. In the field of rein-forced concrete, there is... a growing interest for the introduction of conductive cement-based composites for monitoring the health of structures through the evaluation of their electronic parameters. In this work, resistivity and piezoresistivity of mortars added with graphene nano-platelets (GNP), and carbon fibers (CF) were evaluated. The variations in electrical resistivity as a function of strain were analyzed under cyclic uniaxial compression of the mortars sam-ples. The results shown a high piezoresistivity behavior of the mortars with an optimal disper-sion of GNP and CF, with a quite reversible relation between fractional change in resistivity (FCR) and compressive strain.
Continua a leggere

The Impact of Bitumen Roofing Production Waste (BTw) on Physical Mechanical Properties of Concrete
Anno: 2019
Rivista: IOP CONFERENCE SERIES: MATERIALS SCIENCE AND ENGINEERING
Autori/autrici: Vaiciene, Marija; Malaiskiene, Jurgita; Mobili, Alessandra; Tittarelli, Francesca
Lingua: ENG
Classificazione IRIS: 1.1 Articolo in rivista
Scheda completa IRIS: https://iris.univpm.it/handle/11566/269924
Citazioni:
The Impact of Bitumen Roofing Production Waste (BTw) on Physical Mechanical Properties of Concrete / Vaiciene, Marija; Malaiskiene, Jurgita; Mobili, Alessandra; Tittarelli, Francesca. - In: IOP CONFERENCE SERIES: MATERIALS SCIENCE AND ENGINEERING. - ISSN 1757-8981. - ELETTRONICO. - 603:022094(2019), pp. 1-10.
Abstract:
This article presents how concrete properties would change if part of a coarse aggregate (granite crushed stone) were replaced with bitumen roofing production waste (BTw). BTw is a huge ecological problem because these wastes are generated in large quantities when replacing old bitumen-based roof... tiles. Wastes are also produced during the production of bituminous roof coatings. Usually BTw are stored in landfills or it is attempted to use/dispose them in the production of asphalt concrete. There are very few works which analyse the impact of BTw on the properties of cement materials, although the impact of these wastes on the properties of cement materials could be beneficial because BTw consist of aggregate, granules, bitumen and fibers. In order to use BTw, standard concrete samples were first formed, then 5/16 granite fraction was replaced with BTw in amounts of 2%, 4% and 6% by weight The amounts of limestone Portland cement, fine aggregate (sand), water and superplasticizer in the concrete mixtures were constant. The new generation of superplasticizer based on polycarboxylates was used in mixtures. The following concrete properties were identified and analyzed: density of the mixture, flowability, density of concrete samples, water absorption, compressive strength, forecasted frost resistance, and microstructure studies were conducted as well. The results of the studies showed that BTw can be used in small amounts, i. e. up to 6%, then the density of the samples slightly decreased (by 2.4%) and water absorption increased (by 0.7%). Compressive strength, after replacing 2% granite crushed stone, decreased by 2.4%. However, gradual addition of the amount of BTw resulted in more closed pores that improved the frost resistance of the concrete. When 6% of bulk filler was replaced with BTw, closed porosity, compared to control samples, increased by 54% and forecasted frost resistance - by 26%. Microstructure analysis showed that with 6% BTw a dense cement stone structure was formed, showing the hydrates of portlandite and CSH.
Continua a leggere

Sustainability in Construction Materials: From Waste Valorization to Circular Economy
Anno: 2019
Autori/autrici: Ruello, Maria Letizia; Bellezze, Tiziano; Corinaldesi, Valeria; Donnini, Jacopo; Eusebi, Anna Laura; Fatone, Francesco; Fava, Gabriele; Favoni, Orlando; Fratesi, Romeo; Giosue', Chiara; Giuliani, Giampaolo; Marcellini, Mirco; Mazzoli, Alida; Mobili, Alessandra; Roventi, Gabriella; Tittarelli, Francesca
Lingua: ENG
Classificazione IRIS: 2.1 Contributo in volume (Capitolo o Saggio)
Scheda completa IRIS: https://iris.univpm.it/handle/11566/272692
Citazioni:
Sustainability in Construction Materials: From Waste Valorization to Circular Economy / Ruello, Maria Letizia; Bellezze, Tiziano; Corinaldesi, Valeria; Donnini, Jacopo; Eusebi, Anna Laura; Fatone, Francesco; Fava, Gabriele; Favoni, Orlando; Fratesi, Romeo; Giosue', Chiara; Giuliani, Giampaolo; Marcellini, Mirco; Mazzoli, Alida; Mobili, Alessandra; Roventi, Gabriella; Tittarelli, Francesca. - STAMPA. - (2019), pp. 279-296. [10.1007/978-3-030-32762-0_16]
Abstract:
Already from the beginning, 50 years ago, the first nucleus of researchers establishing the research group, was convinced that the construction sector was the best option for the valorization of industrial by-products as “secondary raw materials”. In fact, this sector is probably the largest con...sumer of resources and the largest waste generator, consequently it has huge environmental impact. On the other hand, construction materials affect the performance of buildings with respect to safety, health, environmental performance and energy efficiency. Manufacturing of construction products using alternative raw materials; recycling to manage construction and demolition waste; durability and environmental compatibility of materials: all these were the different and challenging fields of research that the group has faced in a continuous effort of innovation and cooperation at national and international level. The focus of the group was already perfectly in line with what is now called “Circular Economy”, which at present is considered a revolution in the way of human economic development. We are sure the group thus contributed to this revolution even before the term was in current use. We feel ready for the next 50.
Continua a leggere

Performance of lightweight cement-based and alkali-activated mortars exposed to high-temperature
Anno: 2019
Rivista: CONSTRUCTION AND BUILDING MATERIALS
Autori/autrici: Giosue', Chiara; Mobili, Alessandra; DI PERNA, Costanzo; Tittarelli, Francesca
Lingua: ENG
Classificazione IRIS: 1.1 Articolo in rivista
Scheda completa IRIS: https://iris.univpm.it/handle/11566/267324
Citazioni:
Performance of lightweight cement-based and alkali-activated mortars exposed to high-temperature / Giosue', Chiara; Mobili, Alessandra; DI PERNA, Costanzo; Tittarelli, Francesca. - In: CONSTRUCTION AND BUILDING MATERIALS. - ISSN 0950-0618. - STAMPA. - 220:(2019), pp. 565-576. [10.1016/j.conbuildmat.2019.05.193]
Abstract:
The behavior of lightweight cement-based and alkali-activated mortars after exposure to temperatures of 500, 750, and 1000 C was compared. In cement-based mortars, cement was partially replaced (40 vol%) by several refractory fillers (coal fly-ash, biomass fly-ash, cocciopesto, metakaolin). In alkal...i-activated mortars, metakaolin was partially substituted (0, 25, 50 wt%) by coal fly-ash. The substitution of cement by 40% metakaolin and the substitution of metakaolin by 50% fly ash enhances the resistance to high temperatures of cement-based and alkali-activated mortars, respectively. After exposure to 1000 C, the high residual compressive strength of cement-based mortars with metakaolin is due to the formation of new crystalline species, whereas in alkali-activated mortars is due to their high densification.
Continua a leggere

Properties of multifunctional lightweight mortars containing zeolite and natural fibers
Anno: 2019
Rivista: JOURNAL OF SUSTAINABLE CEMENT BASED MATERIALS
Autori/autrici: Giosuè, C.; Mobili, A.; Yu, Q. L.; Brouwers, H. J. H.; Ruello, M. L.; Tittarelli, F.
Lingua: ENG
Classificazione IRIS: 1.1 Articolo in rivista
Scheda completa IRIS: https://iris.univpm.it/handle/11566/266704
Citazioni:
Properties of multifunctional lightweight mortars containing zeolite and natural fibers / Giosuè, C.; Mobili, A.; Yu, Q. L.; Brouwers, H. J. H.; Ruello, M. L.; Tittarelli, F.. - In: JOURNAL OF SUSTAINABLE CEMENT BASED MATERIALS. - ISSN 2165-0373. - ELETTRONICO. - (2019), pp. 1-14. [10.1080/21650373.2019.1615012]
Abstract:
The article focuses on the development of innovative and multifunctional mortars with low environmental impact for indoor applications acting as passive systems to moderate extremes of humidity and to lower the concentration of pollutants. Mortars are manufactured by keeping constant the water/binde...r ratio, using sand as reference aggregate, and by replacing the total volume of sand with zeolite. In some mixes the aggregate, is also at 25vol% by wool natural fibers. Regardless lightness, zeolite thanks to its pozzolanic activity, helps to improve the compressive strength of mortars manufactured with wool fibers. In addition, the combination of zeolite and wool increases the hygro-thermal performance of mortars: water vapor resistance factor (22% lower than the reference), moisture buffering value (100% higher than the reference), and thermal conductivity (66% lower than the reference), respectively. Depolluting properties of zeolite-based mortars, in terms of adsorption capacity, are 65% lower than that of reference mortar.
Continua a leggere

VERAM Research and Innovation Roadmap 2050 - A Sustainable and Competitive Future for European Raw Materials
Anno: 2018
Autori/autrici: Elvnert, Johan; Hyrkko, Heini; Mattos, Thais; Ebestreit, Corina; Wall, Patrick; Pool, Henk; Agyeman-Budu, Esther; Mendes, Marina; Nelen, Dirk; Mayer, Sabne; Ferrari, Andrea; Dall'Oro, Lorenzo; Tittarelli, Francesca; Mobili, Alessandra; Maki, Rikard; Wilhelmsson, Lars; Kinos, Timo
Lingua: ENG
Classificazione IRIS: 5.12 Altro
Scheda completa IRIS: https://iris.univpm.it/handle/11566/257694
Citazioni:
VERAM Research and Innovation Roadmap 2050 - A Sustainable and Competitive Future for European Raw Materials / Elvnert, Johan; Hyrkko, Heini; Mattos, Thais; Ebestreit, Corina; Wall, Patrick; Pool, Henk; Agyeman-Budu, Esther; Mendes, Marina; Nelen, Dirk; Mayer, Sabne; Ferrari, Andrea; Dall'Oro, Lorenzo; Tittarelli, Francesca; Mobili, Alessandra; Maki, Rikard; Wilhelmsson, Lars; Kinos, Timo. - STAMPA. - (2018), pp. 1-48.

The effect of superficial hydrophobic treatments to increase the frost durability of concrete evaluated by means of acoustic emission and CDF test
Anno: 2018
Autori/autrici: Mobili, A.; Vadalà, M.; Tittarelli, F.; Lupascu, D. C.
Lingua: ENG
Classificazione IRIS: 4.2 Abstract in Atti di convegno
Scheda completa IRIS: https://iris.univpm.it/handle/11566/285566
Citazioni:
The effect of superficial hydrophobic treatments to increase the frost durability of concrete evaluated by means of acoustic emission and CDF test / Mobili, A.; Vadalà, M.; Tittarelli, F.; Lupascu, D. C.. - STAMPA. - (2018). (Intervento presentato al convegno The second Materials Chain International Conference, MCIC 2018 tenutosi a Bochum, Germany. nel November 12 to November 14 2018).
Abstract:
Reinforced concrete structures (RCS) exposed to freezing phenomena in the presence of de-icing salts are known to be subjected to the corrosion of embedded reinforcements. The penetration of aggressive substances inside concrete is related to water suction through capillary action. In order to slow ...down this action, concrete surface can be treated by applying hydrophobic solutions in the admixture or onto the surface. The superficial layer which is formed can modify the water contact angle and hence hinder the water penetration. This research work is focused on the durability of concrete with or without hydrophobic treatments, and exposed to freeze-thaw cycles. Four different concrete mixtures were prepared at the same aggregate/cement ratio by varying the water/binder ratios (0.50, 0.55, 0.60, 0.65). Specimens were studied in terms of mechanical and stability properties. Flexural and compressive strength tests and CDF-test after exposure of 28-days cured concrete specimens in presence of de-icing salts were performed. Acoustic emission measurements are still going on. Results obtained highlight that the application of the surface treatment with hydrophobic admixture is an important parameter for increasing the resistance of concrete to frost phenomena.
Continua a leggere

A COMPARISON BETWEEN CALCIUM SULFOALUMINATE CEMENT AND FLY ASH-BASED GEOPOLYMER AS SUSTAINABLE BINDERS FOR NON-STRUCTURAL AND STRUCTURAL MORTARS
Anno: 2018
Autori/autrici: Mobili, Alessandra; Telesca, Antonio; Marroccoli, Milena; Tittarelli, Francesca
Lingua: ENG
Classificazione IRIS: 4.2 Abstract in Atti di convegno
Scheda completa IRIS: https://iris.univpm.it/handle/11566/258927
Citazioni:
A COMPARISON BETWEEN CALCIUM SULFOALUMINATE CEMENT AND FLY ASH-BASED GEOPOLYMER AS SUSTAINABLE BINDERS FOR NON-STRUCTURAL AND STRUCTURAL MORTARS / Mobili, Alessandra; Telesca, Antonio; Marroccoli, Milena; Tittarelli, Francesca. - STAMPA. - (2018), pp. 54-54. (Intervento presentato al convegno International Workshop on Calcium Sulfoaluminate Cements 2018 tenutosi a Murten, Switzerland nel 4-6 June 2018).

Calcium Sulfoaluminate and Geopolymeric Binders as Alternatives to OPC
Anno: 2018
Autori/autrici: Mobili, Alessandra; Belli, Alberto; Telesca, Antonio; Marroccoli, Milena; Tittarelli, Francesca
Lingua: ENG
Classificazione IRIS: 4.1 Contributo in Atti di convegno
Scheda completa IRIS: https://iris.univpm.it/handle/11566/260680
Citazioni:
Calcium Sulfoaluminate and Geopolymeric Binders as Alternatives to OPC / Mobili, Alessandra; Belli, Alberto; Telesca, Antonio; Marroccoli, Milena; Tittarelli, Francesca. - STAMPA. - (2018), pp. 1-10. (Intervento presentato al convegno 2nd International Workshop on Durability and Sustainability of Concrete Structures (DSCS-2018) tenutosi a Moscow, Russia nel June 6-7, 2018).
Abstract:
This work presents calcium sulfoaluminate (CSA) cement and geopolymeric binder (GEO) as environment-friendly alternatives to ordinary Portland cement (OPC). Mortars based on these binders were tested and compared at the same non-structural strength class (R2 ≥ 15 MPa, according to EN 1504-3). Bind...er pastes were preliminarily prepared to study their hydration behaviour by means of differential thermalthermogravimetric (DT-TG) and X-ray diffraction (XRD) analyses. Afterwards, the relative mortars were compared in terms of both fresh (workability) and hardened state properties (compressive strength, dynamic modulus of elasticity, adhesion to bricks, and water vapor permeability). Durability was also investigated in terms of capillary water absorption, drying and restrained shrinkage. Porosimetric analysis allowed to better correlate experimental results with microstructural features of the investigated mixtures. Results showed that GEO-based mortar exhibits the lowest modulus of elasticity, causing the lowest restrained shrinkage and the highest free drying shrinkage. Moreover, its highest porosity determines both the highest capillary water absorption and permeability to water vapor. On the contrary, the CSA-based mortar displays the lowest drying shrinkage, the greatest modulus of elasticity, and the lowest porosity which ensures the lowest capillary water absorption.
Continua a leggere

Bricks and Concrete Wastes as Coarse and Fine Aggregates in Sustainable Mortars
Anno: 2018
Rivista: ADVANCES IN MATERIALS SCIENCE AND ENGINEERING
Autori/autrici: Mobili, Alessandra; Giosue', Chiara; Corinaldesi, Valeria; Tittarelli, Francesca
Lingua: ENG
Classificazione IRIS: 1.1 Articolo in rivista
Scheda completa IRIS: https://iris.univpm.it/handle/11566/259827
Citazioni:
Bricks and Concrete Wastes as Coarse and Fine Aggregates in Sustainable Mortars / Mobili, Alessandra; Giosue', Chiara; Corinaldesi, Valeria; Tittarelli, Francesca. - In: ADVANCES IN MATERIALS SCIENCE AND ENGINEERING. - ISSN 1687-8434. - ELETTRONICO. - 2018:8676708(2018), pp. 1-11. [10.1155/2018/8676708]
Abstract:
The total substitution by volume of natural coarse calcareous aggregate by coarse recycled brick aggregate (RBA) and coarse recycled concrete aggregate (RCA) has been investigated to produce more sustainable and environment-friendly mortars. Aggregates were also partially substituted by their fine...s at 12.5% by volume. Mortars have been tested in terms of mechanical, microstructural, and durability properties. Results show that it is feasible to replace a natural calcareous aggregate entirely by recycled aggregates. In particular, the obtained mortars, even if more porous and more prone to the water capillary absorption than that manufactured with natural aggregates, result in less stiffness and thus are less subjected to crack formation, more permeable to water vapour, and less susceptible to sulphate attack.
Continua a leggere

Evaluating the Self-Sensing Ability of Cement Mortars Manufactured with Graphene Nanoplatelets, Virgin or Recycled Carbon Fibers through Piezoresistivity Tests
Anno: 2018
Rivista: SUSTAINABILITY
Autori/autrici: Belli, Alberto; Mobili, Alessandra; Bellezze, Tiziano; Tittarelli, Francesca; Cachim, Paulo
Lingua: ENG
Classificazione IRIS: 1.1 Articolo in rivista
Scheda completa IRIS: https://iris.univpm.it/handle/11566/261671
Citazioni:
Evaluating the Self-Sensing Ability of Cement Mortars Manufactured with Graphene Nanoplatelets, Virgin or Recycled Carbon Fibers through Piezoresistivity Tests / Belli, Alberto; Mobili, Alessandra; Bellezze, Tiziano; Tittarelli, Francesca; Cachim, Paulo. - In: SUSTAINABILITY. - ISSN 2071-1050. - ELETTRONICO. - 10:4013(2018), pp. 1-12.
Abstract:
This paper presents the resistivity and piezoresistivity behavior of cement-based mortars manufacturedwithgraphenenanoplateletfiller(GNP),virgincarbonfibers(VCF)andrecycledcarbon fibers (RCF). GNP was added at 4% of the cement weight, whereas two percentages of carbon fibers werechosen,namely0.0...5%and0.2%ofthetotalvolume. Thecombinedeffectofbothfillerandfibers was also investigated. Mortars were studied in terms of their mechanical properties (under flexure and compression) and electrical resistivity. Mortars with the lowest electrical resistivity values were also subjected to cyclic uniaxial compression to evaluate the variations in electrical resistivity as a function of strain. The results obtained show that mortars have piezoresistive behavior only if they aresubjectedtoapriordryingprocess. Inaddition,dryspecimensexhibitahighpiezoresistivityonly when loaded with 0.2 vol.% of VCF and 0.4 wt.% of GNP plus 0.2 vol.% RCF, with a quite reversible relation between their fractional change in resistivity (FCR) and compressive strain.
Continua a leggere

Metakaolin-based inorganic polymer synthesis using cotton shell ash as sole alkaline activator
Anno: 2018
Rivista: CONSTRUCTION AND BUILDING MATERIALS
Autori/autrici: Balo, A. M.; Rahier, H.; Mobili, A.; Katsiki, A.; Fagel, N.; Chinje, U. M.; Njopwouo, D.
Lingua: ENG
Classificazione IRIS: 1.1 Articolo in rivista
Scheda completa IRIS: https://iris.univpm.it/handle/11566/282201
Citazioni:
Metakaolin-based inorganic polymer synthesis using cotton shell ash as sole alkaline activator / Balo, A. M.; Rahier, H.; Mobili, A.; Katsiki, A.; Fagel, N.; Chinje, U. M.; Njopwouo, D.. - In: CONSTRUCTION AND BUILDING MATERIALS. - ISSN 0950-0618. - ELETTRONICO. - 191:(2018), pp. 1011-1022. [10.1016/j.conbuildmat.2018.10.047]
Abstract:
Inorganic polymers were synthesised using metakaolin and cotton shell ash as activator. In this way, the negative environmental impact of sodium or potassium silicate solutions as alkaline activators can be eliminated. Phase transformations investigated using FTIR suggested the formation of inorgani...c polymers through the shift of the most intense band from 1031 cm−1 in metakaolin to around 973 cm−1 in the final product and the absence of the band at 789 cm−1 in the latter. XRD results revealed the presence of kalsilite and zeolite K-F, which appear as hexagonal and elongated crystals in SEM. A maximum compressive strength of 36.7 MPa was obtained. Compressive strength values increased with increasing K/Al ratios and with the reduction of pore densities due to the formation of the amorphous inorganic polymer matrix as observed on the SEM micrographs. Cotton shell ash can thus be used as an alternative activator.
Continua a leggere

Recycled Glass as Aggregate for Architectural Mortars
Anno: 2018
Rivista: INTERNATIONAL JOURNAL OF CONCRETE STRUCTURES AND MATERIALS
Autori/autrici: Tittarelli, Francesca; Giosue', Chiara; Mobili, Alessandra
Lingua: ENG
Classificazione IRIS: 1.1 Articolo in rivista
Scheda completa IRIS: https://iris.univpm.it/handle/11566/260190
Citazioni:
Recycled Glass as Aggregate for Architectural Mortars / Tittarelli, Francesca; Giosue', Chiara; Mobili, Alessandra. - In: INTERNATIONAL JOURNAL OF CONCRETE STRUCTURES AND MATERIALS. - ISSN 1976-0485. - STAMPA. - 12:57(2018), pp. 1-11. [10.1186/s40069-018-0290-3]
Abstract:
The possibility of recycling mixed colour waste glass as it is for manufacturing decorative architectural mortars, has been investigated. In mortars, the 0–33–66–100% of calcareous gravel volume has been replaced with recycled glass cullets, with no other inorganic addition. To mitigate the po...ssible alkali–silica reaction, mixes with a hydrophobic admixture were also compared. The obtained results show that the replacement of calcareous gravel with glass cullets of similar grain size distribution permits to reduce the dosage of the superplasticizer admixture to obtain the same workability of fresh mortar; it does not affect significantly the mechanical performances, the water vapour permeability and the capillary water absorption but it reduces significantly the drying shrinkage deformation. The used recycled glass is classified as no reactive in terms of alkali–silica reaction neither in water nor in NaOH solution following the parameters of the current normative, even in the absence of the hydrophobic admixture. The hydrophobic admixture further delays the expansion trigger but not the speed of its propagation.
Continua a leggere

Binders alternative to Portland cement and waste management for sustainable construction - Part 1
Anno: 2018
Rivista: JOURNAL OF APPLIED BIOMATERIALS & FUNCTIONAL MATERIALS
Autori/autrici: Coppola, Luigi; Bellezze, Tiziano; Belli, Alberto; Chiara Bignozzi, Maria; Bolzoni, Fabio; Brenna, Andrea; Cabrini, Marina; Candamano, Sebastiano; Cappai, Marta; Caputo, Domenico; Carsana, Maddalena; Casnedi, Ludovica; Cioffi, Raffaele; Cocco, Ombretta; Coffetti, Denny; Colangelo, Francesco; Coppola, Bartolomeo; Corinaldesi, Valeria; Crea, Fortunato; Crotti, Elena; Daniele, Valeria; De Gisi, Sabino; Delogu, Francesco; Vittoria Diamanti, Maria; Di Maio, Luciano; Di Mundo, Rosa; Di Palma, Luca; Donnini, Jacopo; Farina, Ilenia; Ferone, Claudio; Frontera, Patrizia; Gastaldi, Matteo; Giosue', Chiara; Incarnato, Loredana; Liguori, Barbara; Lollini, Federica; Lorenzi, Sergio; Manzi, Stefania; Marino, Ottavio; Marroccoli, Milena; Cristina Mascolo, Maria; Mavilia, Letterio; Mazzoli, Alida; Medici, Franco; Meloni, Paola; Merlonetti, Glauco; Mobili, Alessandra; Notarnicola, Michele; Ormellese, Marco; Pastore, Tommaso; Pia Pedeferri, Maria; Petrella, Andrea; Pia, Giorgio; Redaelli, Elena; Roviello, Giuseppina; Scarfato, Paola; Scoccia, Giancarlo; Taglieri, Giuliana; Telesca, Antonio; Tittarelli, Francesca; Todaro, Francesco; Vilardi and Fan Yang, Giorgio
Lingua: ENG
Classificazione IRIS: 1.1 Articolo in rivista
Scheda completa IRIS: https://iris.univpm.it/handle/11566/259226
Citazioni:
Binders alternative to Portland cement and waste management for sustainable construction - Part 1 / Coppola, Luigi; Bellezze, Tiziano; Belli, Alberto; Chiara Bignozzi, Maria; Bolzoni, Fabio; Brenna, Andrea; Cabrini, Marina; Candamano, Sebastiano; Cappai, Marta; Caputo, Domenico; Carsana, Maddalena; Casnedi, Ludovica; Cioffi, Raffaele; Cocco, Ombretta; Coffetti, Denny; Colangelo, Francesco; Coppola, Bartolomeo; Corinaldesi, Valeria; Crea, Fortunato; Crotti, Elena; Daniele, Valeria; De Gisi, Sabino; Delogu, Francesco; Vittoria Diamanti, Maria; Di Maio, Luciano; Di Mundo, Rosa; Di Palma, Luca; Donnini, Jacopo; Farina, Ilenia; Ferone, Claudio; Frontera, Patrizia; Gastaldi, Matteo; Giosue', Chiara; Incarnato, Loredana; Liguori, Barbara; Lollini, Federica; Lorenzi, Sergio; Manzi, Stefania; Marino, Ottavio; Marroccoli, Milena; Cristina Mascolo, Maria; Mavilia, Letterio; Mazzoli, Alida; Medici, Franco; Meloni, Paola; Merlonetti, Glauco; Mobili, Alessandra; Notarnicola, Michele; Ormellese, Marco; Pastore, Tommaso; Pia Pedeferri, Maria; Petrella, Andrea; Pia, Giorgio; Redaelli, Elena; Roviello, Giuseppina; Scarfato, Paola; Scoccia, Giancarlo; Taglieri, Giuliana; Telesca, Antonio; Tittarelli, Francesca; Todaro, Francesco; Vilardi and Fan Yang, Giorgio. - In: JOURNAL OF APPLIED BIOMATERIALS & FUNCTIONAL MATERIALS. - ISSN 2280-8000. - STAMPA. - 16:3(2018), pp. 186-202. [10.1177/2280800018782845]
Abstract:
This review presents “a state of the art” report on sustainability in construction materials. The authors propose different solutions to make the concrete industry more environmentally friendly in order to reduce greenhouse gases emissions and consumption of non-renewable resources. Part 1—...the present paper—focuses on the use of binders alternative to Portland cement, including sulfoaluminate cements, alkali-activated materials, and geopolymers. Part 2 will be dedicated to traditional Portland-free binders and waste management and recycling in mortar and concrete production.
Continua a leggere

VERAM, for a sustainable and competitive future for EU Raw Materials
Anno: 2018
Rivista: IOP CONFERENCE SERIES: MATERIALS SCIENCE AND ENGINEERING
Autori/autrici: Mobili, Alessandra; Tittarelli, Francesca; Revel, Gian Marco; Wall, Patrick
Lingua: ENG
Classificazione IRIS: 1.1 Articolo in rivista
Scheda completa IRIS: https://iris.univpm.it/handle/11566/256460
Citazioni:
VERAM, for a sustainable and competitive future for EU Raw Materials / Mobili, Alessandra; Tittarelli, Francesca; Revel, Gian Marco; Wall, Patrick. - In: IOP CONFERENCE SERIES: MATERIALS SCIENCE AND ENGINEERING. - ISSN 1757-899X. - STAMPA. - 329:012001(2018), pp. 1-8. [10.1088/1757-899X/329/1/012001]
Abstract:
The project, VERAM “Vision and Roadmap for European Raw Materials”, aims to deliver a mapping of on-going initiatives on non-food, non-energy raw materials (including metals, industrial minerals, aggregates and wood) at European, Member State, and regional levels both from the Research and Inno...vation (R&I), industry, and policy perspectives. Moreover, based on a comprehensive gap analysis, VERAM will propose a common long term 2050 Vision and Roadmap in coordination and cooperation with all stakeholders across the value chain. For the first time, two European Technology Platforms (ETPs) together with their corresponding European Research Area Networks (ERA-NETs) are joining forces to develop a common roadmap.
Continua a leggere

Binders alternative to Portland cement and waste management for sustainable construction – Part 2
Anno: 2018
Rivista: JOURNAL OF APPLIED BIOMATERIALS & FUNCTIONAL MATERIALS
Autori/autrici: Coppola, Luigi; Bellezze, Tiziano; Belli, Alberto; C Bignozzi, Maria; Bolzoni, Fabio; Brenna, Andrea; Cabrini, Marina; Candamano, Sebastiano; Cappai, Marta; Caputo, Domenico; Carsana, Maddalena; Casnedi, Ludovica; Cioffi, Raffaele; Cocco6, Ombretta; Coffetti, Denny; Colangelo8, Francesco; Coppola, Bartolomeo; Corinaldesi, Valeria; Crea, Fortunato; Crotti, Elena; Daniele, Valeria; De Gisi, Sabino; Delogu, Francesco; V Diamanti, Maria; Di Maio, Luciano; Di Mundo, Rosa; Di Palma, Luca; Donnini, Jacopo; Farina, Ilenia; Ferone, Claudio; Frontera, Patrizia; Gastaldi, Matteo; Giosue', Chiara; Incarnato, Loredana; Liguori, Barbara; Lollini, Federica; Lorenzi, Sergio; Manzi, Stefania; Marino, Ottavio; Marroccoli, Milena; C Mascolo, Maria; Mavilia, Letterio; Mazzoli, Alida; Medici, Franco; Meloni, Paola; Merlonetti, Glauco; Mobili, Alessandra; Notarnicola, Michele; Ormellese, Marco; Pastore, Tommaso; Pia Pedeferri, Maria; Petrella, Andrea; Pia6, Giorgio; Redaelli, Elena; Roviello, Giuseppina; Scarfato, Paola; Scoccia, Giancarlo; Taglieri, Giuliana; Telesca, Antonio; Tittarelli, Francesca; Todaro, Francesco; Vilardi, Giorgio; Yang, Fan
Lingua: ENG
Classificazione IRIS: 1.1 Articolo in rivista
Scheda completa IRIS: https://iris.univpm.it/handle/11566/259227
Citazioni:
Binders alternative to Portland cement and waste management for sustainable construction – Part 2 / Coppola, Luigi; Bellezze, Tiziano; Belli, Alberto; C Bignozzi, Maria; Bolzoni, Fabio; Brenna, Andrea; Cabrini, Marina; Candamano, Sebastiano; Cappai, Marta; Caputo, Domenico; Carsana, Maddalena; Casnedi, Ludovica; Cioffi, Raffaele; Cocco6, Ombretta; Coffetti, Denny; Colangelo8, Francesco; Coppola, Bartolomeo; Corinaldesi, Valeria; Crea, Fortunato; Crotti, Elena; Daniele, Valeria; De Gisi, Sabino; Delogu, Francesco; V Diamanti, Maria; Di Maio, Luciano; Di Mundo, Rosa; Di Palma, Luca; Donnini, Jacopo; Farina, Ilenia; Ferone, Claudio; Frontera, Patrizia; Gastaldi, Matteo; Giosue', Chiara; Incarnato, Loredana; Liguori, Barbara; Lollini, Federica; Lorenzi, Sergio; Manzi, Stefania; Marino, Ottavio; Marroccoli, Milena; C Mascolo, Maria; Mavilia, Letterio; Mazzoli, Alida; Medici, Franco; Meloni, Paola; Merlonetti, Glauco; Mobili, Alessandra; Notarnicola, Michele; Ormellese, Marco; Pastore, Tommaso; Pia Pedeferri, Maria; Petrella, Andrea; Pia6, Giorgio; Redaelli, Elena; Roviello, Giuseppina; Scarfato, Paola; Scoccia, Giancarlo; Taglieri, Giuliana; Telesca, Antonio; Tittarelli, Francesca; Todaro, Francesco; Vilardi, Giorgio; Yang, Fan. - In: JOURNAL OF APPLIED BIOMATERIALS & FUNCTIONAL MATERIALS. - ISSN 2280-8000. - STAMPA. - (2018), pp. 1-15. [10.1177/2280800018782852]
Abstract:
The paper represents the “state of the art” on sustainability in construction materials. In Part 1 of the paper, issues related to production, microstructures, chemical nature, engineering properties, and durability of mixtures based on binders alternative to Portland cement were presented. This... second part of the paper concerns the use of traditional and innovative Portland-free lime-based mortars in the conservation of cultural heritage, and the recycling and management of wastes to reduce consumption of natural resources in the production of construction materials. The latter is one of the main concerns in terms of sustainability since nowadays more than 75% of wastes are disposed of in landfills.
Continua a leggere

Corrosion behaviour of bare and galvanized steel in geopolymer and Ordinary Portland Cement based mortars with the same strength class exposed to chlorides
Anno: 2018
Rivista: CORROSION SCIENCE
Autori/autrici: Tittarelli, Francesca; Mobili, Alessandra; Giosuè, Chiara; Belli, Alberto; Bellezze, Tiziano
Lingua: ENG
Classificazione IRIS: 1.1 Articolo in rivista
Scheda completa IRIS: https://iris.univpm.it/handle/11566/255934
Citazioni:
Corrosion behaviour of bare and galvanized steel in geopolymer and Ordinary Portland Cement based mortars with the same strength class exposed to chlorides / Tittarelli, Francesca; Mobili, Alessandra; Giosuè, Chiara; Belli, Alberto; Bellezze, Tiziano. - In: CORROSION SCIENCE. - ISSN 0010-938X. - STAMPA. - 134:(2018), pp. 64-77. [10.1016/j.corsci.2018.02.014]
Abstract:
The corrosion behaviour of bare and galvanized steel reinforcements in geopolymeric and cementitious mortars, at three strength classes, has been investigated throughout the curing period and exposure to wet-dry cycles in 3.5% NaCl solution. During the curing, the high alkalinity of geopolymers pr...olongs the active state of both bare and galvanized steel. During the chloride exposure, fly ash geopolymers give the highest protection to reinforcements. The higher alkalinity of geopolymers compared to cement mortars seems to decrease the minimum free chloride threshold necessary to induce corrosion for galvanized steel, but it increases that for bare steel.
Continua a leggere

Valorisation of GRP Dust Waste in Fired Clay Bricks
Anno: 2018
Rivista: ADVANCES IN CIVIL ENGINEERING
Autori/autrici: Mobili, Alessandra; Giosuè, Chiara; Tittarelli, Francesca
Lingua: ENG
Classificazione IRIS: 1.1 Articolo in rivista
Scheda completa IRIS: https://iris.univpm.it/handle/11566/258690
Citazioni:
Valorisation of GRP Dust Waste in Fired Clay Bricks / Mobili, Alessandra; Giosuè, Chiara; Tittarelli, Francesca. - In: ADVANCES IN CIVIL ENGINEERING. - ISSN 1687-8086. - ELETTRONICO. - 2018:(2018), pp. 1-9. [10.1155/2018/5256741]
Abstract:
In Europe, the total amount of Glass Reinforced Plastic (GRP) waste is increasing. In order to valorise GRP dust (GRPd) waste and to reduce the consumption of nonrenewable resources in building materials, GRPd has been already investigated in cementitious materials where it gives even an improveme...nt in some performances of the final products. Valorisation of GRPd waste in the production of bricks can be considered as a further alternative. In this paper, GRPd waste was substituted to the clay volume at 5% and 10% for the manufacturing of fired clay bricks. All specimens were subjected to a firing temperature of 850°C for 6 hours, then tested and compared in terms of porosity, compressive and flexural strengths, density, and water absorption. Despite a decrease in compressive strength up to 46% with 10% of GRPd substitution and an increase of water absorption from 14% to 29% with 5% and 10% of GRPd substitution, respectively, an increase in terms of lightness (about 10%), maximum flexural strength (up to 31%), and deflections at the maximum load (up to 130%) has been registered by specimens with 10% of GRPd substitution.
Continua a leggere

Comportamento a corrosione di armature in acciaio e acciaio zincato in matrici geo-polimeriche e cementizie esposte a cloruri e carbonatazione accelerata
Anno: 2017
Autori/autrici: Mobili, Alessandra; Belli, Alberto; Giosue', Chiara; Bellezze, Tiziano; Tittarelli, Francesca
Lingua: ITA
Classificazione IRIS: 4.2 Abstract in Atti di convegno
Scheda completa IRIS: https://iris.univpm.it/handle/11566/245133
Citazioni:
Comportamento a corrosione di armature in acciaio e acciaio zincato in matrici geo-polimeriche e cementizie esposte a cloruri e carbonatazione accelerata / Mobili, Alessandra; Belli, Alberto; Giosue', Chiara; Bellezze, Tiziano; Tittarelli, Francesca. - STAMPA. - (2017). (Intervento presentato al convegno Giornate di Studio sui Geopolimeri IX edizione Geopolimeri e Compositi tenutosi a Napoli nel 26-27 gennaio 2017).
Abstract:
Il presente lavoro confronta il comportamento a corrosione di armature in acciaio e acciaio zincato in matrici cementizie e geopolimeriche a pari classe di resistenza (R1, R2, R3). I risultati hanno mostrato che l’elevata alcalinità dei geopolimeri rallenta il raggiungimento della condizione di p...assività delle armature, in particolare per quelle in acciaio zincato. Dopo circa 10 giorni, tutte le armature danno velocità di corrosione paragonabili a quelle delle barre immerse nelle malte cementizie. La bassa porosità dei geopolimeri con cenere volante limita l’ingresso dei cloruri e offre la maggiore protezione a entrambi i tipi di barre. Durante l’esposizione ai cicli di bagnasciuga in acqua, successiva all’esposizione in camera di carbonatazione, entrambi i tipi di armatura registrano le più basse velocità di corrosione se immersi nei geopolimeri con cenere volante.
Continua a leggere

Comportamento a corrosione di armature zincate in malte geopolimeriche e cementizie a parità di classe di resistenza - Corrosion behavior of galvanized steel reinforcements in geopolymeric and cementitious mortars at the same strength class
Anno: 2017
Autori/autrici: Mobili, Alessandra; Belli, Alberto; Giosue', Chiara; Bellezze, Tiziano; Tittarelli, Francesca
Lingua: ENG
Classificazione IRIS: 4.1 Contributo in Atti di convegno
Scheda completa IRIS: https://iris.univpm.it/handle/11566/249647
Citazioni:
Comportamento a corrosione di armature zincate in malte geopolimeriche e cementizie a parità di classe di resistenza - Corrosion behavior of galvanized steel reinforcements in geopolymeric and cementitious mortars at the same strength class / Mobili, Alessandra; Belli, Alberto; Giosue', Chiara; Bellezze, Tiziano; Tittarelli, Francesca. - CD-ROM. - (2017). (Intervento presentato al convegno Giornate Nazionali sulla Corrosione e Protezione - XII edizione tenutosi a Milano nel 28-30 giugno 2017).
Abstract:
The corrosion behavior of galvanized steel rebars embedded in geopolymer mortar was compared to that of the same reinforcements embedded in a cementitious mortar with the same mechanical strength class. The corrosion potential and the corrosion rate of these bars were measured throughout the first m...onth of curing for all manufactured specimens, and then one half was submitted to weekly wet-dry cycles in 3.5% NaCl solution and the other half to weekly wet-dry cycles in tap water after exposure to a chamber with 3% of CO2. In the first month, the high alkalinity of geopolymers delayed the achievement of the galvanized steel passive state, but after reinforcements reached the same corrosion rates of those embedded in the cementitious mortars. In chlorides exposure, the lowest porosity of geopolymers hindered the ingress of chloride ions offering the highest protection to reinforcements. Also in carbonated matrices, during exposure to wet-dry cycles in tap water, galvanized bars had the lowest corrosion rates when embedded in the geopolymeric matrices.
Continua a leggere

Effect of commercial and waste carbonaceous fillers on the mechanical and electrical properties of innovative mortars
Anno: 2017
Rivista: JOURNAL OF APPLIED BIOMATERIALS & FUNCTIONAL MATERIALS
Autori/autrici: Mobili, Alessandra; Belli, Alberto; Giosue', Chiara; Mancini, Roberto; Mazzoli, Alida; Bellezze, Tiziano; Tittarelli, Francesca
Classificazione IRIS: 1.5 Abstract in rivista
Scheda completa IRIS: https://iris.univpm.it/handle/11566/251377
Citazioni:
Effect of commercial and waste carbonaceous fillers on the mechanical and electrical properties of innovative mortars / Mobili, Alessandra; Belli, Alberto; Giosue', Chiara; Mancini, Roberto; Mazzoli, Alida; Bellezze, Tiziano; Tittarelli, Francesca. - In: JOURNAL OF APPLIED BIOMATERIALS & FUNCTIONAL MATERIALS. - ISSN 2280-8000. - ELETTRONICO. - (2017). [10.5301/jabfm.5000369]

Chararacterization of bricks and mortars used in Quang Tri citadel -Vietnam
Anno: 2017
Rivista: JOURNAL OF APPLIED BIOMATERIALS & FUNCTIONAL MATERIALS
Autori/autrici: Giosue', Chiara; Carlorosi, Cecilia; Marcellini, Mirco; Mobili, Alessandra; Van Tan, N; Pugnaloni, Fausto; Tittarelli, Francesca
Lingua: ENG
Classificazione IRIS: 1.5 Abstract in rivista
Scheda completa IRIS: https://iris.univpm.it/handle/11566/251378
Citazioni:
Chararacterization of bricks and mortars used in Quang Tri citadel -Vietnam / Giosue', Chiara; Carlorosi, Cecilia; Marcellini, Mirco; Mobili, Alessandra; Van Tan, N; Pugnaloni, Fausto; Tittarelli, Francesca. - In: JOURNAL OF APPLIED BIOMATERIALS & FUNCTIONAL MATERIALS. - ISSN 2280-8000. - ELETTRONICO. - (2017).

Malta Multifunzionale
Anno: 2017
Autori/autrici: Tittarelli, Francesca; Ruello, Maria Letizia; Giosue', Chiara; Mobili, Alessandra
Classificazione IRIS: 6.1 Brevetto
Scheda completa IRIS: https://iris.univpm.it/handle/11566/295288
Citazioni:
Malta Multifunzionale / Tittarelli, Francesca; Ruello, Maria Letizia; Giosue', Chiara; Mobili, Alessandra. - STAMPA. - (2017).

Effect of unconventional fillers on the performances of commercial paints for indoor applications
Anno: 2017
Rivista: JOURNAL OF APPLIED BIOMATERIALS & FUNCTIONAL MATERIALS
Autori/autrici: Giosue', Chiara; Belli, Alberto; Mobili, Alessandra; Tribuiani, C; Favoni, Orlando; Ruello, Maria Letizia; Tittarelli, Francesca
Lingua: ENG
Classificazione IRIS: 1.5 Abstract in rivista
Scheda completa IRIS: https://iris.univpm.it/handle/11566/251379
Citazioni:
Effect of unconventional fillers on the performances of commercial paints for indoor applications / Giosue', Chiara; Belli, Alberto; Mobili, Alessandra; Tribuiani, C; Favoni, Orlando; Ruello, Maria Letizia; Tittarelli, Francesca. - In: JOURNAL OF APPLIED BIOMATERIALS & FUNCTIONAL MATERIALS. - ISSN 2280-8000. - ELETTRONICO. - (2017).

Comportamento a corrosione di armature zincate in malte geopolimeriche e cementizie a parità di classe di resistenza - Corrosion behavior of galvanized steel reinforcements in geopolymeric and cementitious mortars at the same strength class
Anno: 2017
Rivista: LA METALLURGIA ITALIANA
Autori/autrici: Mobili, Alessandra; Belli, Alberto; Giosue', Chiara; Bellezze, Tiziano; Tittarelli, Francesca
Lingua: ENG
Classificazione IRIS: 1.1 Articolo in rivista
Scheda completa IRIS: https://iris.univpm.it/handle/11566/250491
Citazioni:
Comportamento a corrosione di armature zincate in malte geopolimeriche e cementizie a parità di classe di resistenza - Corrosion behavior of galvanized steel reinforcements in geopolymeric and cementitious mortars at the same strength class / Mobili, Alessandra; Belli, Alberto; Giosue', Chiara; Bellezze, Tiziano; Tittarelli, Francesca. - In: LA METALLURGIA ITALIANA. - ISSN 0026-0843. - STAMPA. - n. 7/8:(2017), pp. 47-50.
Abstract:
The corrosion behavior of galvanized steel rebars embedded in geopolymer mortar was compared to that of the same reinforcements embedded in a cementitious mortar with the same mechanical strength class. The corrosion potential and the corrosion rate of these bars were measured throughout the first m...onth of curing for all manufactured specimens, and then one half was submitted to weekly wet-dry cycles in 3.5% NaCl solution and the other half to weekly wet-dry cycles in tap water after exposure to a chamber with 3% of CO2. In the first month, the high alkalinity of geopolymers delayed the achievement of the galvanized steel passive state, but after reinforcements reached the same corrosion rates of those embedded in the cementitious mortars. In chlorides exposure, the lowest porosity of geopolymers hindered the ingress of chloride ions offering the highest protection to reinforcements. Also in carbonated matrices, during exposure to wet-dry cycles in tap water, galvanized bars had the lowest corrosion rates when embedded in the geopolymeric matrices.
Continua a leggere

The use of a Phosphate-Based Migrating Corrosion Inhibitor to Repair Reinforced Concrete Elements Contaminated by Chlorides
Anno: 2017
Rivista: IOP CONFERENCE SERIES: MATERIALS SCIENCE AND ENGINEERING
Autori/autrici: Tittarelli, Francesca; Mobili, Alessandra; Bellezze, Tiziano
Lingua: ENG
Classificazione IRIS: 1.1 Articolo in rivista
Scheda completa IRIS: https://iris.univpm.it/handle/11566/251355
Citazioni:
The use of a Phosphate-Based Migrating Corrosion Inhibitor to Repair Reinforced Concrete Elements Contaminated by Chlorides / Tittarelli, Francesca; Mobili, Alessandra; Bellezze, Tiziano. - In: IOP CONFERENCE SERIES: MATERIALS SCIENCE AND ENGINEERING. - ISSN 1757-899X. - ELETTRONICO. - 225:012106(2017), pp. 1-9. [10.1088/1757-899X/225/1/012106]
Abstract:
The use of sodium monofluorophosphate (MFP) was experimented as migrator inhibiting treatment against corrosion of reinforced concrete elements induced by chlorides. The results show that sodium monofluorophosphate, applied by surface impregnation, is able to slow down reinforcement corrosion onl...y for reinforcing steel bars with concrete cover not thicker than 1 cm. This limitation is most probably due to the difficulty, with the type of application adopted, in making MFP to reach concentrations high enough to inhibit the corrosive process at greater depths from the impregnation surface.
Continua a leggere

Effect of the Type of Surface Treatment and Cement on the Chloride Induced Corrosion of Galvanized Reinforcements
Anno: 2017
Rivista: IOP CONFERENCE SERIES: MATERIALS SCIENCE AND ENGINEERING
Autori/autrici: Tittarelli, Francesca; Mobili, Alessandra; Vicere', Annamaria; Roventi, Gabriella; Bellezze, Tiziano
Lingua: ENG
Classificazione IRIS: 1.1 Articolo in rivista
Scheda completa IRIS: https://iris.univpm.it/handle/11566/251669
Citazioni:
Effect of the Type of Surface Treatment and Cement on the Chloride Induced Corrosion of Galvanized Reinforcements / Tittarelli, Francesca; Mobili, Alessandra; Vicere', Annamaria; Roventi, Gabriella; Bellezze, Tiziano. - In: IOP CONFERENCE SERIES: MATERIALS SCIENCE AND ENGINEERING. - ISSN 1757-8981. - ELETTRONICO. - 245:022088(2017). [10.1088/1757-899X/245/2/022088]
Abstract:
The effect of a new passivation treatment, obtained by immersion of the galvanized reinforcements in a trivalent chromium salts based solution, on the chlorides induced corrosion has been investigated. To investigate also the effect of cement alkalinity on corrosion behaviour of reinforcements, c...oncretes manufactured with three different European cements were compared. The obtained results show that the alternative treatment based on hexavalent chromium-free baths forms effective protection layers on the galvanized rebar surfaces. The higher corrosion rates of zinc coating in concrete manufactured with Portland cement compared to those recorded for bars in concrete manufactured with pozzolanic cement depends strongly on the higher chloride content at the steel concrete interface.
Continua a leggere

Calcium Sulfoaluminate, Geopolymeric, and Cementitious Mortars for Structural Applications
Anno: 2017
Rivista: ENVIRONMENTS
Autori/autrici: Mobili, Alessandra; Belli, Alberto; Giosue', Chiara; Telesca, Antonio; Marroccoli, Milena; Tittarelli, Francesca
Lingua: ENG
Classificazione IRIS: 1.1 Articolo in rivista
Scheda completa IRIS: https://iris.univpm.it/handle/11566/251172
Citazioni:
Calcium Sulfoaluminate, Geopolymeric, and Cementitious Mortars for Structural Applications / Mobili, Alessandra; Belli, Alberto; Giosue', Chiara; Telesca, Antonio; Marroccoli, Milena; Tittarelli, Francesca. - In: ENVIRONMENTS. - ISSN 2076-3298. - STAMPA. - 4:64(2017), pp. 1-18. [10.3390/environments4030064]
Abstract:
This paper deals with the study of calcium sulfoaluminate (CSA) and geopolymeric (GEO) binders as alternatives to ordinary Portland cement (OPC) for the production of more environmentally-friendly construction materials. For this reason, three types of mortar with the same mechanical strength cla...ss (R3 25 MPa, according to EN 1504-3) were tested and compared; they were based on CSA cement, an alkaline activated coal fly ash, and OPC. Firstly, binder pastes were prepared and their hydration was studied by means of X-ray diffraction (XRD) and differential thermal-thermogravimetric (DT-TG) analyses. Afterwards, mortars were compared in terms of workability, dynamic modulus of elasticity, adhesion to red clay bricks, free and restrained drying shrinkage, water vapor permeability, capillary water absorption, and resistance to sulfate attack. DT-TG and XRD analyses evidenced the main reactive phases of the investigated binders involved in the hydration reactions. Moreover, the sulfoaluminate mortar showed the smallest free shrinkage and the highest restrained shrinkage, mainly due to its high dynamic modulus of elasticity. The pore size distribution of geopolymeric mortar was responsible for the lowest capillary water absorption at short times and for the highest permeability to water vapor and the greatest resistance to sulfate attack.
Continua a leggere

Improving the Impact of Commercial Paint on Indoor Air Quality by Using Highly Porous Fillers
Anno: 2017
Rivista: BUILDINGS
Autori/autrici: Giosue', Chiara; Belli, Alberto; Mobili, Alessandra; Citterio, Barbara; Biavasco, Francesca; Ruello, Maria Letizia; Tittarelli, Francesca
Lingua: ENG
Classificazione IRIS: 1.1 Articolo in rivista
Scheda completa IRIS: https://iris.univpm.it/handle/11566/252233
Citazioni:
Improving the Impact of Commercial Paint on Indoor Air Quality by Using Highly Porous Fillers / Giosue', Chiara; Belli, Alberto; Mobili, Alessandra; Citterio, Barbara; Biavasco, Francesca; Ruello, Maria Letizia; Tittarelli, Francesca. - In: BUILDINGS. - ISSN 2075-5309. - STAMPA. - 7:110(2017), pp. 1-15. [10.3390/buildings7040110]
Abstract:
In the current paper, the effect on Indoor Air Quality (IAQ) of two commercial acrylic-based paints were compared: one (Paint A) for indoor applications, the other (Paint B) for indoor/outdoor applications. Both were applied on an inert and on a real mortar substrate. The possibility of Paint B t...o passively improve IAQ was also investigated when adding highly porous adsorbent fillers, both as addition or as total replacement of a conventional siliceous one. The obtained results show that all paints have high capacity to inhibit biological growth. Paint A is more breathable and it has a higher moisture buffering capacity. Paint B negatively modifies the beneficial properties of the mortar substrate for IAQ. However, the use of unconventional fillers, especially as addition to the formulation, allows the recovery of the same properties of the substrate or even the enhancement of about 20% of the ability to adsorb volatile organic compounds (VOCs) under the current test conditions.
Continua a leggere

The Effect of Fly Ash on the Corrosion Behaviour of Galvanised Steel Rebars in Concrete
Anno: 2017
Rivista: IOP CONFERENCE SERIES: MATERIALS SCIENCE AND ENGINEERING
Autori/autrici: Tittarelli, Francesca; Mobili, Alessandra; Bellezze, Tiziano
Lingua: ENG
Classificazione IRIS: 1.1 Articolo in rivista
Scheda completa IRIS: https://iris.univpm.it/handle/11566/251356
Citazioni:
The Effect of Fly Ash on the Corrosion Behaviour of Galvanised Steel Rebars in Concrete / Tittarelli, Francesca; Mobili, Alessandra; Bellezze, Tiziano. - In: IOP CONFERENCE SERIES: MATERIALS SCIENCE AND ENGINEERING. - ISSN 1757-899X. - ELETTRONICO. - 225:012107(2017), pp. 1-8. [10.1088/1757-899X/225/1/012107]
Abstract:
The effect of fly ash on the corrosion behaviour of galvanised steel rebars in cracked concrete specimens exposed to wet-dry cycles in a chloride solution has been investigated. The obtained results show that the use of fly ash, replacing either cement or aggregate, always improves the corrosion ...behaviour of galvanised steel reinforcements. In particular, the addition of fly ash, even in the presence of concrete cracks, decreases the corrosion rate monitored in very porous concretes, as those with w/c = 0.80, to values comparable with those obtained in good quality concretes, as those with w/c = 0.45. Therefore, fly ash cancels the negative effect, at least from the corrosion point of view, of a great porosity of the cement matrix.
Continua a leggere

Stainless and Galvanized Steel, Hydrophobic Admixture and Flexible Polymer-Cement Coating Compared in Increasing Durability of Reinforced Concrete Structures
Anno: 2017
Rivista: IOP CONFERENCE SERIES: MATERIALS SCIENCE AND ENGINEERING
Autori/autrici: Tittarelli, Francesca; Giosue', Chiara; Mobili, Alessandra
Lingua: ENG
Classificazione IRIS: 1.1 Articolo in rivista
Scheda completa IRIS: https://iris.univpm.it/handle/11566/251358
Citazioni:
Stainless and Galvanized Steel, Hydrophobic Admixture and Flexible Polymer-Cement Coating Compared in Increasing Durability of Reinforced Concrete Structures / Tittarelli, Francesca; Giosue', Chiara; Mobili, Alessandra. - In: IOP CONFERENCE SERIES: MATERIALS SCIENCE AND ENGINEERING. - ISSN 1757-899X. - ELETTRONICO. - 225:012109(2017), pp. 1-9. [10.1088/1757-899X/225/1/012109]
Abstract:
The use of stainless or galvanized steel reinforcements, a hydrophobic admixture or a flexible polymer-cement coating were compared as methods to improve the corrosion resistance of sound or cracked reinforced concrete specimens exposed to chloride rich solutions. The results show that in full im...mersion condition, negligible corrosion rates were detected in all cracked specimens, except those treated with the flexible polymer-cement mortar as preventive method against corrosion and the hydrophobic concrete specimens. High corrosion rates were measured in all cracked specimens exposed to wet-dry cycles, except for those reinforced with stainless steel, those treated with the flexible polymer-cement coating as restorative method against reinforcement corrosion and for hydrophobic concrete specimens reinforced with galvanized steel reinforcements
Continua a leggere

Influence of Binders and Lightweight Aggregates on the Properties of Cementitious Mortars: From Traditional Requirements to Indoor Air Quality Improvement
Anno: 2017
Rivista: MATERIALS
Autori/autrici: Giosue', Chiara; Pierpaoli, Mattia; Mobili, Alessandra; Ruello, Maria Letizia; Tittarelli, Francesca
Lingua: ENG
Classificazione IRIS: 1.1 Articolo in rivista
Scheda completa IRIS: https://iris.univpm.it/handle/11566/250516
Citazioni:
Influence of Binders and Lightweight Aggregates on the Properties of Cementitious Mortars: From Traditional Requirements to Indoor Air Quality Improvement / Giosue', Chiara; Pierpaoli, Mattia; Mobili, Alessandra; Ruello, Maria Letizia; Tittarelli, Francesca. - In: MATERIALS. - ISSN 1996-1944. - STAMPA. - 10:8(2017), p. 978. [10.3390/ma10080978]
Abstract:
Innovative and multifunctional mortars for renders and panels were manufactured using white photocatalytic and non-photocatalytic cement as binder. Unconventional aggregates, based on lightweight materials with high specific surface and adsorbent properties, were adopted in order to investigate the ...possible ability to passively improve indoor air quality. The reference mortar was manufactured with traditional calcareous sand. Results show that even if the mechanical properties of mortars with unconventional aggregates generally decrease, they remain acceptable for application as render. The innovative mortars were able to passively improve indoor air quality in terms of transpirability (70% higher), moisture buffering ability (65% higher) and depolluting capacity (up to 75% higher) compared to traditional ones under the current test conditions.
Continua a leggere

Geopolymeric and cementitious mortars for buildings: comparison at the same strength class
Anno: 2016
Autori/autrici: Mobili, Alessandra
Lingua: ENG
Classificazione IRIS: 8.2 Tesi di dottorato (EX-A3)
Scheda completa IRIS: https://iris.univpm.it/handle/11566/243089
Citazioni:
Geopolymeric and cementitious mortars for buildings: comparison at the same strength class / Mobili, Alessandra. - (2016).
Abstract:
La tesi ha riguardato lo studio di malte geopolimeriche e cementizie a parità di classe di resistenza meccanica (R1, R2, R3 e R4 secondo la UNI EN 1504-3:2006) per applicazioni edili. Nella prima parte sono state testate malte cementizie contenenti fibre o tessuti come rinforzo di pannelli murari ...assemblati con malta di allettamento in calce aerea o cementizia. I rinforzi migliori sono risultate le malte di classe R2 contenenti fibre in polipropilene, poiché hanno impedito il collasso sotto compressione assiale e incrementato del 47% la resistenza diagonale dei pannelli murari assemblati con malta cementizia. Nella seconda parte, malte cementizie e geopolimeriche appartenenti alle classi R1, R2, R3 e R4 sono state confrontate in termini di densità, lavorabilità, modulo elastico dinamico, tensione di aderenza, porosità, permeabilità al vapore acqueo, assorbimento d’acqua per capillarità, ritiro igrometrico libero e contrastato, resistenza ai solfati e comportamento a corrosione di eventuali barre immerse in acciaio nero e zincato indotta da cloruri o carbonatazione. Nei geopolimeri il ritiro libero è maggiore rispetto alle malte cementizie, ma quello contrastato è minore per via del basso modulo elastico. Le dimensioni dei pori influenzano la permeabilità al vapore, maggiore nei geopolimeri, e l’assorbimento d’acqua, minore nei geopolimeri con cenere volante. L’alta alcalinità dei geopolimeri ritarda il raggiungimento dello stato passivo delle armature, soprattutto se zincate, ma dopo un mese di stagionatura si ottengono velocità di corrosione simili a quelle riscontrate nelle malte cementizie. Durante l’esposizione ai cloruri e dopo carbonatazione, i geopolimeri in cenere volante proteggono maggiormente le armature in acciaio nero; mentre le malte cementizie proteggono maggiormente gli acciai zincati. Infine, è stata studiata la possibilità di ottenere geopolimeri “one-part” aggiungendo solo acqua agli ingredienti solidi per renderne più facile l’utilizzo pratico.
Continua a leggere

COMMERCIAL AND WASTE CARBON BASED NANO/MICRO FILLERS FOR THE DEVELOPMENT OF INNOVATIVE AND MULTIFUNCTIONAL MORTARS
Anno: 2016
Autori/autrici: Tittarelli, Francesca; Belli, Alberto; Mobili, Alessandra; Roventi, Gabriella; Corinaldesi, Valeria; Mazzoli, Alida; Bellezze, Tiziano; Ruello, Maria Letizia
Lingua: ENG
Classificazione IRIS: 4.3 Poster
Scheda completa IRIS: https://iris.univpm.it/handle/11566/246367
Citazioni:
COMMERCIAL AND WASTE CARBON BASED NANO/MICRO FILLERS FOR THE DEVELOPMENT OF INNOVATIVE AND MULTIFUNCTIONAL MORTARS / Tittarelli, Francesca; Belli, Alberto; Mobili, Alessandra; Roventi, Gabriella; Corinaldesi, Valeria; Mazzoli, Alida; Bellezze, Tiziano; Ruello, Maria Letizia. - STAMPA. - (2016). (Intervento presentato al convegno Cost Action 15107, Multi-Functional Nano-Carbon Composite Materials - MULTICOMP, Scientific Kick-Off meeting tenutosi a Crete nel October 19-20, 2016).

Photocatalytic Cement-based Mortars with Unconventional Aggregates for the Improvement of Indoor Air Quality
Anno: 2016
Autori/autrici: Giosue', Chiara; Pierpaoli, Mattia; Mobili, Alessandra; Tittarelli, Francesca; Ruello, Maria Letizia
Lingua: ENG
Classificazione IRIS: 4.2 Abstract in Atti di convegno
Scheda completa IRIS: https://iris.univpm.it/handle/11566/238679
Citazioni:
Photocatalytic Cement-based Mortars with Unconventional Aggregates for the Improvement of Indoor Air Quality / Giosue', Chiara; Pierpaoli, Mattia; Mobili, Alessandra; Tittarelli, Francesca; Ruello, Maria Letizia. - ELETTRONICO. - (2016), pp. 170-170. (Intervento presentato al convegno 9th European Meeting on Solar Chemistry and Photocatalysis: Environmental Applications (SPEA-9) tenutosi a Strasbourg nel June 13-17 2016).
Abstract:
Using of passive systems to improve Indoor Air Quality (IAQ) could be very useful in terms of energy savings and comfort of occupants. This study focused on an innovative and multifunctional mortar able to improve IAQ. The action of Photocatalytic binder coupled with adsorbent materials used as aggr...egates was investigated. Results show better water vapour permeability and moisture buffering capacity, and lower mechanical properties of unconventional-aggregate based mortars with respect to the traditional ones. With respect to VOC, depollution capacity of the former was up to 65% higher than the mortar prepared with sand. The addition of UV irradiation positively influences depollution capacity even in presence of conventional aggregate.
Continua a leggere

THE EFFECT OF FLY ASH ON THE CORROSION BEHAVIOUR OF GALVANISED STEEL REBARS IN CONCRETE
Anno: 2016
Autori/autrici: Tittarelli, Francesca; Mobili, Alessandra; Bellezze, Tiziano
Lingua: ENG
Classificazione IRIS: 4.1 Contributo in Atti di convegno
Scheda completa IRIS: https://iris.univpm.it/handle/11566/249675
Citazioni:
THE EFFECT OF FLY ASH ON THE CORROSION BEHAVIOUR OF GALVANISED STEEL REBARS IN CONCRETE / Tittarelli, Francesca; Mobili, Alessandra; Bellezze, Tiziano. - ELETTRONICO. - (2016), pp. 221-227. (Intervento presentato al convegno International Conference on Advanced Material Technologies (ICAMT)-2016 tenutosi a Dadi Institute of Engineering and Technology (DIET), Visakhapatnam, Andhra Pradesh, India nel 27th-28th December 2016).
Abstract:
The effect of fly ash on the corrosion behaviour of galvanised steel rebars in cracked concrete specimens exposed to wet-dry cycles in a chloride solution has been investigated. The obtained results show that the use of fly ash, replacing either cement or aggregate, always improves the corrosion beh...aviour of galvanised steel reinforcements. In particular, the addition of fly ash, even in the presence of concrete cracks, decreases the corrosion rate monitored in very porous concretes, as those with w/c = 0.80, to values comparable with those obtained in good quality concretes, as those with w/c = 0.45. Therefore, fly ash cancels the negative effect, at least from the corrosion point of view, of a great porosity of the cement matrix.
Continua a leggere

Effect of biomass waste materials as unconventional aggregates in multifunctional mortars for indoor application.
Anno: 2016
Autori/autrici: Giosue', Chiara; Mobili, Alessandra; Toscano, Giuseppe; Ruello, Maria Letizia; Francesca, Tittarelli
Lingua: ENG
Classificazione IRIS: 4.2 Abstract in Atti di convegno
Scheda completa IRIS: https://iris.univpm.it/handle/11566/236252
Citazioni:
Effect of biomass waste materials as unconventional aggregates in multifunctional mortars for indoor application / Giosue', Chiara; Mobili, Alessandra; Toscano, Giuseppe; Ruello, Maria Letizia; Francesca, Tittarelli. - ELETTRONICO. - (2016), pp. 57-57. (Intervento presentato al convegno World Multidisciplinary Civil Engineering-Architecture-Urban Planning Symposium WMCAUS 2016 tenutosi a Prague nel 13-17 June 2016).
Abstract:
In order to decrease energy consumption in buildings, a new way to recycle waste materials coming from biomasses by-product in mortars was studied. In this way a better management of biomass waste, reducing materials in landfill, can also be reached. To this aim, mortars with water/cement equal to 0....5 by weight and aggregate/cement equal to 3.5 by volume were considered. Then, cement was replaced by hydraulic lime and sand was substituted with two different types of spruce sawdust shavings (as it is and roasted), biomass bottom ash and biomass fly ash. The results show that mortar prepared with cement has obviously better mechanical compressive strength and 60% lower capillary water absorption. All unconventional aggregates increase the total porosity of lime mortars from 41%, in the case of biomass bottom ash, to 52% in the case of spruce sawdust shavings and fly ash. Moreover, biomass fly ash and both spruce sawdust shavings, decrease density of mortars to permit the classification as lightweight mortar (with ρ less than 1300 kg/m3). Regardless porosity and lightness, biomass bottom ash improves up to 150% the mechanical performance of lime-based mortars. As regards durability, in general bio-based lime mortars show nearly twice higher capillary water absorption with respect to sand lime mortars. Roasted spruce sawdust shavings and biomass bottom ash decreases the capillary water absorption of lime mortars of about 5% and 50%, respectively regardless of porosity and lightness. All mortars can be classified as permeable to water vapour, since the vapour transmission resistance factors are very close or less than 15. Moreover, spruce sawdust shavings as it is and roasted are able to increase three and two times the capacity of mortar to be a hygroscopic buffer in terms of MBV values. All biomass waste unconventional aggregates improve the depollution capacity in terms of percentage of adsorbed Volatile Organic Compound as Methyl Ethyl Keton (MEK) inside a sealed box of lime-based mortars. In particular, both biomass ashes (bottom and fly) show the best performances with a reduction of MEK concentration 75% higher than reference lime mortars adsorbing up to 95% of MEK after two hours test.
Continua a leggere

COMMERCIAL AND WASTE CARBON BASED NANO/MICRO FILLERS FOR THE DEVELOPMENT OF INNOVATIVE AND MULTIFUNCTIONAL MORTARS
Anno: 2016
Autori/autrici: Belli, Alberto; Mobili, Alessandra; Giosue', Chiara; Toscano, Giuseppe; Mazzoli, Alida; Bellezze, Tiziano; Tittarelli, Francesca
Lingua: ENG
Classificazione IRIS: 4.2 Abstract in Atti di convegno
Scheda completa IRIS: https://iris.univpm.it/handle/11566/246366
Citazioni:
COMMERCIAL AND WASTE CARBON BASED NANO/MICRO FILLERS FOR THE DEVELOPMENT OF INNOVATIVE AND MULTIFUNCTIONAL MORTARS / Belli, Alberto; Mobili, Alessandra; Giosue', Chiara; Toscano, Giuseppe; Mazzoli, Alida; Bellezze, Tiziano; Tittarelli, Francesca. - STAMPA. - (2016). (Intervento presentato al convegno National Young Researchers' Forum on Materials Science and Technology tenutosi a Ischia, Italy nel July 11-13, 2016).

Cement mortars and geopolymers with the same strength class
Anno: 2016
Rivista: PROCEEDINGS OF THE INSTITUTION OF CIVIL ENGINEERS. CONSTRUCTION MATERIALS
Autori/autrici: Mobili, Alessandra; Giosue', Chiara; Bitetti, Michele; Tittarelli, Francesca
Lingua: ENG
Classificazione IRIS: 1.1 Articolo in rivista
Scheda completa IRIS: https://iris.univpm.it/handle/11566/227440
Citazioni:
Cement mortars and geopolymers with the same strength class / Mobili, Alessandra; Giosue', Chiara; Bitetti, Michele; Tittarelli, Francesca. - In: PROCEEDINGS OF THE INSTITUTION OF CIVIL ENGINEERS. CONSTRUCTION MATERIALS. - ISSN 1747-650X. - ELETTRONICO. - 169:1(2016), pp. 3-12. [10.1680/coma.14.00063]
Abstract:
Recycling of industrial waste materials to manufacture environmentally friendly mortars and concretes is gaining more and more interest, in particular for sustainability, rehabilitation and renovation purposes. In the present study geopolymers, which had been made using fly ash as a precursor and ...were subsequently subjected to curing at room temperature, were investigated. Geopolymeric and cementitious mortars with the same mechanical strength class were compared in both the fresh and hardened states. Despite the higher free shrinkage and lower adhesive strength on brick substrate, geopolymeric mortars behaved better than cement types in terms of lower dynamic modulus of elasticity, higher water vapour permeability, lower capillary water absorption and higher resistance to salt crystallisation.
Continua a leggere

Metakaolin and fly ash alkali-activated mortars compared with cementitious mortars at the same strength class
Anno: 2016
Rivista: CEMENT AND CONCRETE RESEARCH
Autori/autrici: Mobili, Alessandra; Belli, Alberto; Giosue', Chiara; Bellezze, Tiziano; Tittarelli, Francesca
Lingua: ENG
Classificazione IRIS: 1.1 Articolo in rivista
Scheda completa IRIS: https://iris.univpm.it/handle/11566/238869
Citazioni:
Metakaolin and fly ash alkali-activated mortars compared with cementitious mortars at the same strength class / Mobili, Alessandra; Belli, Alberto; Giosue', Chiara; Bellezze, Tiziano; Tittarelli, Francesca. - In: CEMENT AND CONCRETE RESEARCH. - ISSN 0008-8846. - STAMPA. - 88:(2016), pp. 198-210. [10.1016/j.cemconres.2016.07.004]
Abstract:
Alkali activated and cementitious mortars belonging to R1 ≥ 10 MPa, R2 ≥ 15 MPa and R3 ≥ 25 MPa strength classes are tested and compared in terms of workability, dynamic modulus of elasticity, porosimetry and water vapour permeability. Capillary water absorption, drying shrinkage, resistance t...o sulphate attack and corrosion behaviour of embedded bare and galvanized reinforcements have also been investigated. In alkali activated mortars, drying shrinkage is higher than that of cementitious mortars but restrained shrinkage is lower due to lower modulus of elasticity. Water vapour permeability is more pronounced in alkali activated mortars, and capillary water absorption is lower in those prepared with fly ash. The high alkalinity of alkali activated mortars was seen to delay the onset of the passive state in particular for galvanized reinforcements, but after one month of curing they were found to reach the same corrosion rates of those embedded in cementitious mortars.
Continua a leggere

Stainless and galvanized steel, hydrophobic admixture and flexible polymer-cement coating compared in increasing durability of reinforced concrete structures
Anno: 2016
Autori/autrici: Tittarelli, Francesca; Giosue', Chiara; Mobili, Alessandra
Classificazione IRIS: 4.1 Contributo in Atti di convegno
Scheda completa IRIS: https://iris.univpm.it/handle/11566/249811
Citazioni:
Stainless and galvanized steel, hydrophobic admixture and flexible polymer-cement coating compared in increasing durability of reinforced concrete structures / Tittarelli, Francesca; Giosue', Chiara; Mobili, Alessandra. - CD-ROM. - (2016), pp. 235-241. (Intervento presentato al convegno International Conference on Advanced Material Technologies (ICAMT)-2016).

Waste materials in the production of traditional building ceramics: effect of GRP dust waste addition on properties of fired bricks
Anno: 2016
Rivista: JOURNAL OF APPLIED BIOMATERIALS & FUNCTIONAL MATERIALS
Autori/autrici: Giosue', Chiara; Mobili, Alessandra; Tittarelli, Francesca
Lingua: ENG
Classificazione IRIS: 1.5 Abstract in rivista
Scheda completa IRIS: https://iris.univpm.it/handle/11566/246184
Citazioni:
Waste materials in the production of traditional building ceramics: effect of GRP dust waste addition on properties of fired bricks / Giosue', Chiara; Mobili, Alessandra; Tittarelli, Francesca. - In: JOURNAL OF APPLIED BIOMATERIALS & FUNCTIONAL MATERIALS. - ISSN 2280-8000. - ELETTRONICO. - (2016), pp. 12-12. [10.5301/jabfm.5000321]
Abstract:
The total amount of end-of-life and production waste generated by glass thermo-set composites market in Europe reaches 304,000 tonnes (2015) triggering interest in optimizing Glass Reinforced Plastic (GRP) waste recovery. Now, landfill as non hazardous waste remains the most popular solution to mana...ge GRP waste for the difficulty of separating the different parts, its intrinsic thermo-set composite nature and the insufficient knowledge on recycling options. Recently, GRP dust (GRPd) waste in cementitious matrix has been investigated to improve performances. Effects of GRPd waste addition in the production of bricks can also be considered. The polymeric part in GRPd will burn during cooking: additional porosity can be left in the matrix improving final lightness; the glass fibers in GRPd waste can reinforce the ceramic matrix decreasing fragility and increasing the bricks bending strength.
Continua a leggere

One part geopolymers activated with potassium-rich biomass ashes
Anno: 2016
Rivista: JOURNAL OF APPLIED BIOMATERIALS & FUNCTIONAL MATERIALS
Autori/autrici: Mobili, Alessandra; Tittarelli, Francesca; Rahier, H.
Lingua: ENG
Classificazione IRIS: 1.5 Abstract in rivista
Scheda completa IRIS: https://iris.univpm.it/handle/11566/246358
Citazioni:
One part geopolymers activated with potassium-rich biomass ashes / Mobili, Alessandra; Tittarelli, Francesca; Rahier, H.. - In: JOURNAL OF APPLIED BIOMATERIALS & FUNCTIONAL MATERIALS. - ISSN 2280-8000. - ELETTRONICO. - (2016), pp. 46-46. [10.5301/jabfm.5000321]
Abstract:
Geopolymers are obtained by the chemical reaction between an aluminosilicate powder and an alkaline solution. Even if geopolymers do not contain Portland cement, they are similar to cementitious materials. Recently, many authors have tried to prepare geopolymers without alkaline activators, since th...ey are user-hostile. These new materials are called one-part geopolymers and appear as a cementitious powder that can polymerize with water. The aim of this work is to investigate the possibility of using a potassium-rich biomass ash for the activation of one-part geopolymers.
Continua a leggere

What if we use biomass ashes to activate one-part geopolymers ?
Anno: 2016
Rivista: JOURNAL OF APPLIED BIOMATERIALS & FUNCTIONAL MATERIALS
Autori/autrici: Mobili, Alessandra; Balo Madi, A.; Peys, A.; Tittarelli, Francesca; Fagel, N.; Chinje Melo, U.; Njopwouo, D.; Rahier, H.
Lingua: ENG
Classificazione IRIS: 1.5 Abstract in rivista
Scheda completa IRIS: https://iris.univpm.it/handle/11566/246186
Citazioni:
What if we use biomass ashes to activate one-part geopolymers ? / Mobili, Alessandra; Balo Madi, A.; Peys, A.; Tittarelli, Francesca; Fagel, N.; Chinje Melo, U.; Njopwouo, D.; Rahier, H.. - In: JOURNAL OF APPLIED BIOMATERIALS & FUNCTIONAL MATERIALS. - ISSN 2280-8000. - ELETTRONICO. - (2016), pp. 15-16. [10.5301/jabfm.5000321]
Abstract:
Geopolymers are cement-like materials obtained by the chemical reaction between a powdered aluminosilicate precursor and an alkaline solution. Recently, researchers are studying alternative ways for geopolymer preparation in order to avoid the use of alkaline activators which are highly corrosive a...nd difficult to handle in construction site works. These user-friendly materials are known as one-part geopolymers and appear as a cementitious powder that can polymerize only by water addition. This work deals with the use of potassium-rich biomass ashes for the activation of two types of one-part geopolymers.
Continua a leggere

Improving Indoor Air quality with passive systems: a new perspective for sustainable indoor building materials
Anno: 2016
Rivista: JOURNAL OF APPLIED BIOMATERIALS & FUNCTIONAL MATERIALS
Autori/autrici: Giosue', Chiara; Mobili, Alessandra; Ruello, Maria Letizia; Mancini, Roberto; Tittarelli, Francesca
Lingua: ENG
Classificazione IRIS: 1.5 Abstract in rivista
Scheda completa IRIS: https://iris.univpm.it/handle/11566/246188
Citazioni:
Improving Indoor Air quality with passive systems: a new perspective for sustainable indoor building materials / Giosue', Chiara; Mobili, Alessandra; Ruello, Maria Letizia; Mancini, Roberto; Tittarelli, Francesca. - In: JOURNAL OF APPLIED BIOMATERIALS & FUNCTIONAL MATERIALS. - ISSN 2280-8000. - ELETTRONICO. - (2016), pp. 37-37. [10.5301/jabfm.5000321]
Abstract:
In order to reduce energy consumption in buildings, more isolated and sealed structures are designed. The resulting poor air changing decreases indoor air quality in terms of not adequate levels of indoor humidity and high concentration of pollutants. Reactive building materials offer an opportun...ity to provide indoor air cleaning with minimal energy use. This research focuses on the development of innovative and multifunctional mortar for indoor panels with low environmental impact able to improve comfort and health of occupants. This material exploits the positive interaction between different constituents usually used separately (e.i. wool insulating panels or lime-zeolite mortars).
Continua a leggere

Effect of Biomass Waste Materials as Unconventional Aggregates in Multifunctional Mortars for Indoor Application
Anno: 2016
Rivista: PROCEDIA ENGINEERING
Autori/autrici: Giosue', Chiara; Mobili, Alessandra; Toscano, Giuseppe; Ruello, Maria Letizia; Tittarelli, Francesca
Lingua: ENG
Classificazione IRIS: 1.1 Articolo in rivista
Scheda completa IRIS: https://iris.univpm.it/handle/11566/246019
Citazioni:
Effect of Biomass Waste Materials as Unconventional Aggregates in Multifunctional Mortars for Indoor Application / Giosue', Chiara; Mobili, Alessandra; Toscano, Giuseppe; Ruello, Maria Letizia; Tittarelli, Francesca. - In: PROCEDIA ENGINEERING. - ISSN 1877-7058. - STAMPA. - 161:(2016), pp. 655-659. [10.1016/j.proeng.2016.08.724]
Abstract:
In order to decrease energy consumption in buildings, a new way to recycle materials coming from biomasses waste in mortars was studied. For this purpose, mortars with water/cement equal to 0.5 by weight and aggregate/cement equal to 3.5 by volume were considered. Cement was replaced by hydraulic ...lime and sand was substituted with two different types of spruce sawdust shavings (as it is and roasted), biomass bottom ash and biomass fly ash. The results show that mortar prepared with cement has obviously a better mechanical strength and 60% lower capillary water absorption. All unconventional aggregates increase the total porosity of lime mortars. Moreover, biomass fly ash and both spruce sawdust shavings based mortars can be classified as lightweight mortar. Regardless of porosity and lightness, biomass bottom ash improves up to 150% the mechanical performance of lime-based mortars. Concerning durability, bio-based lime mortars show in general nearly twice higher capillary water absorption with respect to the sand lime mortars whit the exception of spruce sawdust shavings and biomass bottom ash. Mortars can be classified as permeable to water vapour. As it is and roasted spruce sawdust shavings are able to increase three and two times the capacity of the mortar to be a hygroscopic buffer in terms of MBV values.
Continua a leggere

Effect of using recycled instead of virgin EPS in lightweight mortars
Anno: 2016
Rivista: PROCEDIA ENGINEERING
Autori/autrici: Tittarelli, Francesca; Giosue', Chiara; Mobili, Alessandra; DI PERNA, Costanzo; Monosi, Saveria
Lingua: ENG
Classificazione IRIS: 1.1 Articolo in rivista
Scheda completa IRIS: https://iris.univpm.it/handle/11566/238860
Citazioni:
Effect of using recycled instead of virgin EPS in lightweight mortars / Tittarelli, Francesca; Giosue', Chiara; Mobili, Alessandra; DI PERNA, Costanzo; Monosi, Saveria. - In: PROCEDIA ENGINEERING. - ISSN 1877-7058. - STAMPA. - 161:(2016), pp. 660-665. [10.1016/j.proeng.2016.08.728]
Abstract:
Performances of structural, moderate and heat insulating lightweight mortars manufactured by replacing sand volume with virgin or recycled expanded polystyrene (EPS) are compared. At the same dosage, replacing virgin EPS with recycled one improves the mechanical performance of mortars without signif...icant variation in capillary water absorption and water vapour permeability. Recycled EPS mortars have lower thermal insulation properties than those manufactured with virgin one, but this can be counteracted by increasing the percentage of EPS. To obtain mortars with a certain thermal insulating capacity, an economical save over than 25% can be reached by using recycled EPS.
Continua a leggere

Metakaolin and fly ash based geopolymers compared with cementitious mortars of the same strength class: performances and corrosion behaviour of black and galvanized steel bars
Anno: 2015
Autori/autrici: Mobili, Alessandra; Giosue', Chiara; Belli, Alberto; Bellezze, Tiziano; Tittarelli, Francesca
Lingua: ENG
Classificazione IRIS: 4.2 Abstract in Atti di convegno
Scheda completa IRIS: https://iris.univpm.it/handle/11566/227812
Citazioni:
Metakaolin and fly ash based geopolymers compared with cementitious mortars of the same strength class: performances and corrosion behaviour of black and galvanized steel bars / Mobili, Alessandra; Giosue', Chiara; Belli, Alberto; Bellezze, Tiziano; Tittarelli, Francesca. - STAMPA. - (2015). (Intervento presentato al convegno Geopolymers:The route to eliminate waste and emissions in ceramic and cement manufacturing tenutosi a Hernstein, Austria nel 24-29/05/2015).

Improvement of indoor air quality using photocatalytic cement-based mortars
Anno: 2015
Autori/autrici: Giosue', Chiara; Mobili, Alessandra; Ruello, Maria Letizia; Tittarelli, Francesca
Lingua: ENG
Classificazione IRIS: 2.1 Contributo in volume (Capitolo o Saggio)
Scheda completa IRIS: https://iris.univpm.it/handle/11566/228237
Citazioni:
Improvement of indoor air quality using photocatalytic cement-based mortars / Giosue', Chiara; Mobili, Alessandra; Ruello, Maria Letizia; Tittarelli, Francesca. - ELETTRONICO. - (2015), pp. 914-923.
Abstract:
Recent European laws and directives are stricter in terms of energy efficiency of buildings. Constructions are currently built up more sealed and there is not enough air changing. This condition leads to a greater risk of unhealthy indoor environments. Mortars, plasters and finishings can have an ...active role to improve indoor air quality. In this research five different mortars, with water/cement = 0.5 by weight and aggregate/cement = 3.5 by volume, are manufactured using different aggregates. Conventional aggregate is compared as reference with unconventional aggregates with large specific surface and high porosity, substituted by volume. The binder is a photocatalytic white cement with TiO2, potentially able to decompose the adsorbed pollutants. Mortars are characterized in terms of fresh and hardened properties. The results show that mortars prepared with unconventional aggregates have lower, even still acceptable, mechanical performances with respect to reference one. However, they show better permeability and moisture buffering capacity. Depollution properties are evaluated with the adsorption capacity of Volatile Organic Compounds. Mortars manufactured with unconventional aggregates show a depollution capacity up to two times higher with respect to that of conventional sand. The addition of UV irradiation positively influences depollution capacity even in presence of conventional aggregate.
Continua a leggere

Metakaolin and fly ash based geopolymers compared with cementitious mortars of the same strength class: performances and corrosion behaviour of black and galvanized steel bars
Anno: 2015
Autori/autrici: Mobili, Alessandra; Giosue', Chiara; Belli, Alberto; Bellezze, Tiziano; Tittarelli, Francesca
Lingua: ENG
Classificazione IRIS: 2.1 Contributo in volume (Capitolo o Saggio)
Scheda completa IRIS: https://iris.univpm.it/handle/11566/228044
Citazioni:
Metakaolin and fly ash based geopolymers compared with cementitious mortars of the same strength class: performances and corrosion behaviour of black and galvanized steel bars / Mobili, Alessandra; Giosue', Chiara; Belli, Alberto; Bellezze, Tiziano; Tittarelli, Francesca. - STAMPA. - (2015), pp. 79-82.
Abstract:
Mechanical, morphological and durability aspects of three types of geopolymer mortars were compared with those of traditional cementitious mortars of comparable compressive strength. To this aim, mortars belonging to three mechanical strength classes (R1 ≥ 10 MPa, R2 ≥ 15 MPa and R3 ≥ 25 MPa ...according to EN 1504-3:2005) were tested and compared. Geopolymers were obtained with fly ash and metakaolin as precursors and a mixture of sodium silicate and NaOH or KOH as liquid activators. In order to obtain R1, R2 and R3 mortars cementitious mixtures were prepared by partial substitution of Portland cement with hydraulic lime, while geopolymers were prepared by varying the concentration of NaOH or KOH with a waterglass/hydroxide ratio always equal to 1. The obtained samples were characterized both in the fresh and in the hardened state. The first was evaluated by workability and density of the fresh mortar, the latter by compressive strength, dynamic modulus of elasticity, adhesive strength on ceramic surface, free and restrained shrinkage and by microstructural analysis such as SEM and mercury porosimetry. Durability aspects were also investigated through water vapor permeability, capillary water absorption, resistance to salt crystallization and corrosion of possible embedded rebars. Corrosion tests were carried out by measuring corrosion potential and corrosion rates of black and galvanized steel bars during both the curing period and wet-dry cycles in a chloride solution. At the same mechanical strength class, geopolymers shrink more than cementitious mortars if free while their low modulus of elasticity causes a lower shrinkage if mortars are restrained with bars. Pore dimensions affect the water vapor permeability, which resulted to be more pronounced in geopolymers than in cement mortars, and capillary water absorption with low values especially for fly ash geopolymers. During the first month of curing, the higher alkalinity of geopolymers matrix prolongs the active state of both black and galvanized steel bars. However, when exposed to a chloride solution, fly ash based geopolymers offer a higher protection to reinforcements than cementitious mortars.
Continua a leggere

Influence of binders and aggregates on VOCs adsorption and moisture buffering activity of mortars for indoor applications
Anno: 2015
Rivista: CEMENT & CONCRETE COMPOSITES
Autori/autrici: Tittarelli, Francesca; Giosue', Chiara; Mobili, Alessandra; Ruello, Maria Letizia
Lingua: ENG
Classificazione IRIS: 1.1 Articolo in rivista
Scheda completa IRIS: https://iris.univpm.it/handle/11566/210113
Citazioni:
Influence of binders and aggregates on VOCs adsorption and moisture buffering activity of mortars for indoor applications / Tittarelli, Francesca; Giosue', Chiara; Mobili, Alessandra; Ruello, Maria Letizia. - In: CEMENT & CONCRETE COMPOSITES. - ISSN 0958-9465. - STAMPA. - 57:(2015), pp. 75-83. [10.1016/j.cemconcomp.2014.11.013]
Abstract:
The implementation of energy efficiency measures leads to more tightly sealed buildings. These energysaving measures directly worsen indoor air quality leading to increased humidity and concentration of pollutants as Volatile Organic Compounds (VOCs). Our work compares the de-pollution efficiency ...and moisture buffering capacity of five mortars for indoor applications. Methyl-ethyl-ketone (MEK) is chosen as pollutant model. The effect of binders (cement, cement + air-entraining admixture, lime) and aggregates (sand, zeolite, perlite) on the mechanical properties, water absorption and morphology of mortars was also evaluated. All mortars adsorb MEK during the first period, but only those manufactured with lime–zeolite do not saturate after 30 min with a de-pollution efficiency of about 85% after 24 h. The Moisture Buffering Capacity (MBC) of lime mortars is three times higher with respect to that measured in cement mortars. The MBC of lime–zeolite mortars is double with respect to that measured in lime–sand mortars.
Continua a leggere

Geopolymeric and cementitious mortars with the same mechanical strength class: performances and corrosion behaviour of black and galvanized steel bars
Anno: 2015
Autori/autrici: Mobili, Alessandra; Giosue', Chiara; Belli, Alberto; Bellezze, Tiziano; Tittarelli, Francesca
Lingua: ENG
Classificazione IRIS: 2.1 Contributo in volume (Capitolo o Saggio)
Scheda completa IRIS: https://iris.univpm.it/handle/11566/228051
Citazioni:
Geopolymeric and cementitious mortars with the same mechanical strength class: performances and corrosion behaviour of black and galvanized steel bars / Mobili, Alessandra; Giosue', Chiara; Belli, Alberto; Bellezze, Tiziano; Tittarelli, Francesca. - ELETTRONICO. - (2015), pp. 1-9.
Abstract:
In the prospect of reducing CO2 emissions and landfilling of waste materials, the preparation of sustainable mortars by alkali activation was studied. According to EN 1504-3:2005, geopolymeric and cementitious mortars belonging to different strength classes (R1 ≥ 10 MPa, R2 ≥ 15 MPa and R3 ≥ 2...5 MPa) were tested and compared. Geopolymers were obtained with fly ash or metakaolin and a blend of sodium silicate and NaOH (or KOH). Mortars were tested in terms of workability, dynamic modulus of elasticity, drying and restrained shrinkage and porosimetry. Durability was also investigated in terms of water vapour permeability, capillary water absorption and corrosion of possible embedded rebars during the curing period and wet-dry cycles in 3.5% NaCl solution. Results showed that geopolymers are subjected to higher drying shrinkage but lower restrained shrinkage than cementitious mortars. Water vapour permeability was higher in geopolymers and capillary water absorption was lower especially in fly ash geopolymers than those of cementitious mortars. During the first month, the high alkalinity of geopolymers extends the active state of both black and galvanized steel bars. However, when exposed to chlorides, fly ash geopolymers offer a higher protection to reinforcements than cementitious mortars.
Continua a leggere

Malte geopolimeriche e cementizie a pari classe di resistenza confrontate anche in presenza di armature
Anno: 2014
Autori/autrici: Mobili, Alessandra; Giosue', Chiara; Mancini, Roberto; Bellezze, Tiziano; Tittarelli, Francesca
Lingua: ITA
Classificazione IRIS: 4.1 Contributo in Atti di convegno
Scheda completa IRIS: https://iris.univpm.it/handle/11566/194504
Citazioni:
Malte geopolimeriche e cementizie a pari classe di resistenza confrontate anche in presenza di armature / Mobili, Alessandra; Giosue', Chiara; Mancini, Roberto; Bellezze, Tiziano; Tittarelli, Francesca. - ELETTRONICO. - (2014), pp. 75-79. (Intervento presentato al convegno XII Convegno Nazionale AIMAT tenutosi a Lecce nel 21-24 settembre 2014).
Abstract:
Il crescente interesse nella ricerca di materiali più sostenibili ha portato allo studio di malte geopolimeriche come sostitute delle tradizionali malte a base di cemento Portland. La ricerca si è sviluppata confrontando il comportamento di malte cementizie e geopolimeriche a parità di classe di ...resistenza meccanica (R1 ≥ 10MPa, R2 ≥ 15MPa and R3 ≥ 25MPa). In particolare sono state confezionate tre malte geopolimeriche a base di cenere volante, con rapporto sabbia/cenere di 2.7:1 in peso, e una soluzione di silicato di sodio/idrossido di potassio 1:1 (in peso) a differente concentrazione. Le rispettive malte cementizie sono state confezionate con cemento Portland e calce idraulica come leganti e rapporto sabbia/legante di 3:1 in peso. Le sei miscele sono state confrontate valutando il comportamento a corrosione di possibili armature in acciaio nero e in acciaio zincato durante il primo mese dopo il getto. I risultati hanno evidenziato che l’alta alcalinità delle miscele geopolimeriche incrementa la corrosione di barre in acciaio zincato soltanto durante i primi giorni di stagionatura, mentre le armature in acciaio nero hanno avuto un comportamento simile a quelle immerse nelle matrici cementizie.
Continua a leggere

Comparison of lightweight mortars manufactured with virgin or recycled polystyrene
Anno: 2014
Autori/autrici: Giosue', Chiara; Mobili, Alessandra; DI PERNA, Costanzo; Tittarelli, Francesca
Lingua: ENG
Classificazione IRIS: 4.1 Contributo in Atti di convegno
Scheda completa IRIS: https://iris.univpm.it/handle/11566/152119
Citazioni:
Comparison of lightweight mortars manufactured with virgin or recycled polystyrene / Giosue', Chiara; Mobili, Alessandra; DI PERNA, Costanzo; Tittarelli, Francesca. - (2014), pp. 21-26. (Intervento presentato al convegno Young Researchers' Forum II: Construction Materials tenutosi a London nel 19th February 2014).
Abstract:
In recent years, energy saving in buildings prescribes limits on thermal transmittance of opaque structures that can be achieved with the use of materials with low thermal conductivities. Mortars and concretes lightened with polystyrene pearls belong to this class. In this work, the performance of l...ightweight mortars manufactured with virgin polystyrene is compared with that of mortars manufactured with recycled granules of polystyrene at the same volume dosage. Six mortar mixtures with water/cement = 0.55 by replacing the 33% - 66% - 100% of sand volume with virgin or recycled polystyrene are manufactured. The obtained results show that, at the same volume dosage, the replacing of virgin polystyrene with recycled one improves the mechanical performance of mortars without significant variation in the capillary water absorption and water vapour permeability. The use of recycled polystyrene increases the equivalent thermal conductivity of mortars that can be compensated with a higher dosage of polystyrene. The use of recycled polystyrene allows a significant economical savings during the production phase of mortars and a certain insulation degree.
Continua a leggere

Geopolymeric and cementitious mortars with the same strength class: comparison of the corrosion behaviour of embedded steel and galvanized steel reinforcements
Anno: 2014
Autori/autrici: Bellezze, Tiziano; Mobili, Alessandra; Roventi, Gabriella; Tittarelli, Francesca
Lingua: ENG
Classificazione IRIS: 4.1 Contributo in Atti di convegno
Scheda completa IRIS: https://iris.univpm.it/handle/11566/200904
Citazioni:
Geopolymeric and cementitious mortars with the same strength class: comparison of the corrosion behaviour of embedded steel and galvanized steel reinforcements / Bellezze, Tiziano; Mobili, Alessandra; Roventi, Gabriella; Tittarelli, Francesca. - ELETTRONICO. - (2014). (Intervento presentato al convegno EUROCORR 2014 tenutosi a Pisa (Italy) nel September, 8-12).
Abstract:
Geopolymeric and cementitious mortars with the same strength class and workability were studied and compared in terms of mechanical and corrosion behaviour of possible reinforcements. To this aim, three different geopolymeric and cement mixtures were manufactured in order to obtain mortars belonging... to R1 > 10MPa, R2 > 15MPa and R3 > 25 MPa strength class. In particular, mortars based on geopolymer binder were prepared with fly ash, calcium aluminate cement, a solution of sodium silicate/potassium hydroxide ratio of 0.85:1, with different concentration of KOH, and a sand/binder ratio of 2.7:1, by weight. The respective three cementitious mortar mixtures were prepared with different proportions of ordinary Portland cement and hydraulic lime as binders, different water/binder ratio by weight and the same sand/binder ratio (3:1 by weight). The corrosion resistance of steel and galvanized steel reinforcements was investigated by free corrosion potential and polarization resistance measurements. Finally, metallographic analysis on the cross sections of galvanized bars extracted from the specimens was also carried out. The results showed that, initially, the galvanized steel reinforcements are particularly susceptible to corrosion in geopolymeric mixtures due to their high alkalinity. However, after few days of curing, the corrosion rate decrease, even if this process is slower than that of same reinforcements in cementitious mixtures. On the other hand, in geopolymeric matrix, the steel reinforcements show a lower corrosion rate, if compared with galvanized steel reinforcements, and their corrosion behaviour do not change significantly with the type of binder.
Continua a leggere

Cementitious and geo-polymeric mortars compared with the same mechanical strength class
Anno: 2014
Autori/autrici: Mobili, Alessandra; Giosue', Chiara; Tittarelli, Francesca
Lingua: ENG
Classificazione IRIS: 4.1 Contributo in Atti di convegno
Scheda completa IRIS: https://iris.univpm.it/handle/11566/152120
Citazioni:
Cementitious and geo-polymeric mortars compared with the same mechanical strength class / Mobili, Alessandra; Giosue', Chiara; Tittarelli, Francesca. - (2014), pp. 135-140. (Intervento presentato al convegno Young Researchers' Forum II: Construction Materials tenutosi a University College London, London nel 19th February 2014).
Abstract:
In the perspective of using environmentally friendly materials for the rehabilitation and restoration of ancient buildings, the behaviour of geo-polymeric mortars was studied. The research was developed into two main aspects: substitution of Portland cement with an alternative binder and recycling o...f industrial by-products. The experimentation was carried out comparing the performances of cementitious and geo-polymeric mortars with the same mechanical strength class (R1≥ 10 MPa, R2 ≥ 15 MPa, R3 ≥ 25 MPa, R4 ≥ 45 MPa), according to the European Standard. In particular, four geo-polymeric mixtures were prepared with a sodium silicate/sodium hydroxide proportion of 1:1 with different concentration of NaOH and a sand/fly ash proportion of 2.7:1. Four cementitious mortars were prepared with water/cement equal to 0.5, 0.65, 0.9 and 1.1 by weight, respectively. Different properties both in fresh and hardened state were evaluated and compared. The adherence with brick was reduced when geo-polymeric mortars were used. However, best results were obtained by geo-polymeric mortars with respect to cement ones for vapour permeability, capillarity water absorption, elastic modulus and resistance to salt crystallization.
Continua a leggere

Confronto del comportamento di due differenti tipologie di malte geopolimeriche a base di cenere volante
Anno: 2014
Autori/autrici: Mobili, Alessandra; Giosue', Chiara; M., Bitetti; Favoni, Orlando; Tittarelli, Francesca
Lingua: ITA
Classificazione IRIS: 4.1 Contributo in Atti di convegno
Scheda completa IRIS: https://iris.univpm.it/handle/11566/194503
Citazioni:
Confronto del comportamento di due differenti tipologie di malte geopolimeriche a base di cenere volante / Mobili, Alessandra; Giosue', Chiara; M., Bitetti; Favoni, Orlando; Tittarelli, Francesca. - ELETTRONICO. - (2014), pp. 70-74. (Intervento presentato al convegno XII Convegno Nazionale AIMAT tenutosi a Lecce nel 21-24 settembre 2014).
Abstract:
La sempre maggiore richiesta di materiali da costruzione a ridotto impatto ambientale con la possibilità di riciclare materiali di scarto è stato l’impulso per lo sviluppo di leganti geopolimerici come possibili sostituti del tradizionale cemento Portland per il confezionamento di malte. La ric...erca è stata condotta confrontando le prestazioni di 2 differenti serie di malte a base geopolimerica a parità di classe di resistenza meccanica: R1 ≥ 10MPa, R2 ≥ 15MPa, R3 ≥ 25MPa e R4≥ 45MPa, in accordo con la norma UNI EN 1504-3:2006. I geopolimeri sono il risultato della reazione chimica tra materiali sorgente e una soluzione alcalina. In questo studio, le malte geopolimeriche sono state confezionate con cenere volante (prima serie) e con cenere volante parzialmente sostituita con cemento alluminoso (seconda serie) come materiali sorgente. Come soluzione alcalina è stata utilizzata una soluzione di silicato di sodio e di idrossido di sodio, in assenza di cemento alluminoso, o di potassio, in presenza di cemento alluminoso, a differenti concentrazioni. Tutte le malte geopolimeriche sono state preparate con rapporto sabbia/cenere di 3:1, mantenendo sempre pari a 1 il rapporto tra il peso della soluzione di silicato di sodio e la soluzione di NaOH o KOH. In generale, nonostante la minore permeabilità al vapore rispetto alle miscele con NaOH, le malte con KOH hanno ottenuto pari assorbimento d’acqua per capillarità, una maggiore aderenza al mattone e un minore ritiro libero. Inoltre, la presenza del cemento alluminoso e dell’idrossido di potassio nei geopolimeri ha contribuito alla riduzione delle efflorescenze.
Continua a leggere

Comparison between cementitious and geopolymeric mortars with the same mechanical strength class
Anno: 2014
Autori/autrici: Mobili, Alessandra; Michele, Bitetti; Tittarelli, Francesca
Lingua: ENG
Classificazione IRIS: 4.2 Abstract in Atti di convegno
Scheda completa IRIS: https://iris.univpm.it/handle/11566/178509
Citazioni:
Comparison between cementitious and geopolymeric mortars with the same mechanical strength class / Mobili, Alessandra; Michele, Bitetti; Tittarelli, Francesca. - ELETTRONICO. - (2014), pp. 1-12. (Intervento presentato al convegno 9th International Masonry Conference tenutosi a Guimaraes, Portugal nel July 7-9 2014).
Abstract:
In the perspective of environmental sustainability for the rehabilitation and restoration of masonry buildings, the properties of geopolymeric mortars were studied and compared with those of traditional cement-based ones with the same mechanical strength class and workability. To this aim, four di...fferent geopolymeric and cement mixtures were manufactured in order to obtain mortars belonging to R1  10MPa, R2  15MPa, R3  25 MPa and R4  45 MPa strength class. In particular, geopolymeric mixtures were prepared with a sodium silicate/sodium hydroxide equal to 1:1, by using different concentration of the solutions, and sand/fly ash proportion equal to 2.7:1. The respective four cementitious mortar mixtures were prepared with water/cement equal to 0.5, 0.65, 0.9 and 1.1 by weight. Geopolymer mortars behave better than cement ones in terms of lower elastic modulus, higher water vapour permeability, lower capillary water absorption and higher resistance to salt crystallization.
Continua a leggere

Sustainable and Durable No-fines Concrete for Vertical Applications
Anno: 2014
Rivista: INTERNATIONAL JOURNAL OF CHEMICAL, ENVIRONMENTAL AND BIOLOGICAL SCIENCES
Autori/autrici: Francesca, Tittarelli; Mobili, Alessandra; Giosue', Chiara; Ruello, Maria Letizia
Lingua: ENG
Classificazione IRIS: 4.1 Contributo in Atti di convegno
Scheda completa IRIS: https://iris.univpm.it/handle/11566/149103
Citazioni:
Sustainable and Durable No-fines Concrete for Vertical Applications / Francesca, Tittarelli; Mobili, Alessandra; Giosue', Chiara; Ruello, Maria Letizia. - In: INTERNATIONAL JOURNAL OF CHEMICAL, ENVIRONMENTAL AND BIOLOGICAL SCIENCES. - ISSN 2320-4079. - STAMPA. - (2014), pp. 14-18. (Intervento presentato al convegno International Journal Conference on Humanities, Bio-Science, Chemical and Environmental Engoneering (HBCEE'2014 tenutosi a DUBAI (UAE) nel 6-7 Jan 2014).
Abstract:
No-fines concretes with compressive strength in the range 7-30 MPa at 28 days of curing were optimized by changing the water-cement ratio from 0.41 to 0.34 and the aggregate-cement ratio from 8 to 4. Some mixtures were also repeated with the addition of a hydrophobic admixture and prepared by fully ...replacing the ordinary aggregate with recycled aggregate to evaluate durability effects. High susceptibility to carbonation was observed for all the no-fines mixes studied. The use of recycled aggregate increases capillary water absorption (about 50%); however, the related decrease in durability could be easily counteracted with the use of a hydrophobic admixture.
Continua a leggere

Finiture innovative per ambienti indoor con proprietà adsorbenti di inquinanti aereodispersi
Anno: 2014
Autori/autrici: Giosue', Chiara; Mobili, Alessandra; Marcellini, Mirco; Ruello, Maria Letizia; Tittarelli, Francesca
Lingua: ITA
Classificazione IRIS: 4.1 Contributo in Atti di convegno
Scheda completa IRIS: https://iris.univpm.it/handle/11566/194505
Citazioni:
Finiture innovative per ambienti indoor con proprietà adsorbenti di inquinanti aereodispersi / Giosue', Chiara; Mobili, Alessandra; Marcellini, Mirco; Ruello, Maria Letizia; Tittarelli, Francesca. - ELETTRONICO. - (2014), pp. 89-93. (Intervento presentato al convegno XII Convegno Nazionale AIMAT tenutosi a Lecce nel 21-24 settembre 2014).
Abstract:
Le normative sull’efficienza e le prestazioni energetiche degli edifici sono sempre più stringenti. Tali norme comportano la progettazione e realizzazione di costruzioni isolate e sigillate, con conseguenti minor ricambi d’aria. E’ quindi maggiore il rischio di avere ambienti interni insalubr...i a causa del ristagno di umidità e aumento della concentrazione di inquinanti indoor. Oltre l’utilizzo di sistemi attivi convenzionali, malte e finiture interne possono dare un contributo rilevante all’aumento della qualità dell’aria. In questo studio sei differenti miscele sono state preparate utilizzando calce idraulica e cemento. Per quanto riguarda gli aggregati si è provveduto a sostituire la sabbia con materiali dall’elevata superficie specifica, quali perlite e zeolite. Sono state testate e messe a confronto le proprietà meccaniche e morfologiche, l’assorbimento d’acqua per capillarità, l’efficienza di rimozione di Composti Organici Volatili (COV) e la capacità delle finiture di funzionare come tampone igroscopico. I risultati hanno evidenziato che tutte le malte cementizie hanno, come ben noto, resistenze meccaniche maggiori rispetto a quelle confezionate con calce idraulica. Il legante è influente anche nei riguardi dell’assorbimento d’acqua per capillarità e come regolatore di umidità. Le malte preparate con zeolite risultano essere il migliore tampone igroscopico e hanno un’elevata efficienza di rimozione di COV: dopo trenta minuti di esposizione all’inquinante usato come tracciante non è stata rilevata saturazione.
Continua a leggere

Sustainable and Durable No-fines Concrete for Vertical Applications
Anno: 2013
Rivista: INTERNATIONAL JOURNAL OF CHEMICAL, ENVIRONMENTAL AND BIOLOGICAL SCIENCES
Autori/autrici: Tittarelli, Francesca; Mobili, Alessandra; Giosue', Chiara; Ruello, Maria Letizia
Lingua: ENG
Classificazione IRIS: 1.1 Articolo in rivista
Scheda completa IRIS: https://iris.univpm.it/handle/11566/143877
Citazioni:
Sustainable and Durable No-fines Concrete for Vertical Applications / Tittarelli, Francesca; Mobili, Alessandra; Giosue', Chiara; Ruello, Maria Letizia. - In: INTERNATIONAL JOURNAL OF CHEMICAL, ENVIRONMENTAL AND BIOLOGICAL SCIENCES. - ISSN 2320-4079. - STAMPA. - 1:5(2013), pp. 784-788.
Abstract:
No-fines concretes with compressive strength in the range 7-30 MPa at 28 days of curing were optimized by changing the water-cement ratio from 0.41 to 0.34 and the aggregate-cement ratio from 8 to 4. Some mixtures were also repeated with the addition of a hydrophobic admixture and prepared by fully ...replacing the ordinary aggregate with recycled aggregate to evaluate durability effects. High susceptibility to carbonation was observed for all the no-fines mixes studied. The use of recycled aggregate increases capillary water absorption (about 50%); however, the related decrease in durability could be easily counteracted with the use of a hydrophobic admixture.
Continua a leggere