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, F., Giosue', C., Mobili, A.. - CD-ROM. - (2016), pp. 235-241. (International Conference on Advanced Material Technologies (ICAMT)-2016 ).

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, A., Belli, A., Giosue', C., Bellezze, T., Tittarelli, F.. - 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, resistanc...e to 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.
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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, F., Giosue', C., Mobili, A., DI PERNA, C., Monosi, S.. - 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.
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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', C., Mobili, A., Tittarelli, F.. - 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.
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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, A., Tittarelli, F., 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.
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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', C., Mobili, A., Ruello, M.L., Tittarelli, F.. - 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.
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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, A., Giosue', C., Belli, A., Bellezze, T., Tittarelli, F.. - 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 M...Pa 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.
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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, A., Giosue', C., Belli, A., Bellezze, T., Tittarelli, F.. - STAMPA. - (2015). (Geopolymers:The route to eliminate waste and emissions in ceramic and cement manufacturing Hernstein, Austria 24-29/05/2015).

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, F., Giosue', C., Mobili, A., Ruello, M.L.. - 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.
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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, A., Giosue', C., Belli, A., Bellezze, T., Tittarelli, F.. - 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 &ge...; 25 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.
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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, T., Mobili, A., Roventi, G., Tittarelli, F.. - ELETTRONICO. - (2014). (EUROCORR 2014 Pisa (Italy) 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.
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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, A., Michele, B., Tittarelli, F.. - ELETTRONICO. - (2014), pp. 1-12. (9th International Masonry Conference Guimaraes, Portugal 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.
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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, A., Giosue', C., M., B., Favoni, O., Tittarelli, F.. - ELETTRONICO. - (2014), pp. 70-74. (XII Convegno Nazionale AIMAT Lecce 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 d...i malte. La ricerca 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.
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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, T., Mobili, A., Giosue', C., Ruello, M.L.. - In: INTERNATIONAL JOURNAL OF CHEMICAL, ENVIRONMENTAL AND BIOLOGICAL SCIENCES. - ISSN 2320-4079. - STAMPA. - (2014), pp. 14-18. (International Journal Conference on Humanities, Bio-Science, Chemical and Environmental Engoneering (HBCEE'2014 DUBAI (UAE) 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.
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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, A., Giosue', C., Tittarelli, F.. - (2014), pp. 135-140. (Young Researchers' Forum II: Construction Materials University College London, London 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.
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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', C., Mobili, A., Marcellini, M., Ruello, M.L., Tittarelli, F.. - ELETTRONICO. - (2014), pp. 89-93. (XII Convegno Nazionale AIMAT Lecce 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 ambient...i interni insalubri 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.
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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', C., Mobili, A., DI PERNA, C., Tittarelli, F.. - (2014), pp. 21-26. (Young Researchers' Forum II: Construction Materials London 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.
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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, A., Giosue', C., Mancini, R., Bellezze, T., Tittarelli, F.. - ELETTRONICO. - (2014), pp. 75-79. (XII Convegno Nazionale AIMAT Lecce 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 parit&agr...ave; 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.
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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, F., Mobili, A., Giosue', C., Ruello, M.L.. - 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.
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