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Giuseppina Roviello
University of Naples Federico II
67Publications
17H-index
867Citations
Publications 67
Newest
#1Giuseppina RovielloH-Index: 17
#2Laura RicciottiH-Index: 11
Last.Oreste TaralloH-Index: 18
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The preparation and characterization of innovative organic-inorganic hybrid geopolymers, obtained by valorizing coal fly ash generated from thermoelectric power plants, is reported for the first time. These hybrid materials are prepared by simultaneously reacting fly ash and dimethylsiloxane oligomers at 25 °C in a strongly alkaline environment. Despite their lower density, the obtained materials are characterized by highly improved mechanical properties when compared to the unmodified geopolyme...
#1B. LiguoriH-Index: 13
#2Paolo ApreaH-Index: 10
Last.Claudio FeroneH-Index: 21
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Abstract Many industrial applications need supporting or shaping powdery zeolites. Since geopolymers can be considered the amorphous counterpart or precursors of crystalline zeolites, it is possible to promote zeolite crystallization inside the geopolymeric matrix by tuning pH, temperature and time of the geopolymerization reaction. In this paper, combining zeolite crystallization with a foaming process initiated by silicon, a multifunctional self-supporting zeolitic material has been obtained w...
#1Claudio FeroneH-Index: 21
#2Ilaria Capasso (National Research Council)H-Index: 6
Last.Raffaele CioffiH-Index: 28
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Abstract Alumina-containing water potabilization sludge (WPS) is one of the main wastes produced by reservoir management activities. This kind of residues, deriving from treatment processes for water potabilization, recently attracted great attention as starting raw material in the production of innovative building materials. In this study, the use of WPS as aluminosilicate source for the synthesis of geopolymers has been investigated. In particular, two different potabilization sludge deriving ...
#1Luigi Coppola (University of Bergamo)H-Index: 12
#2T. Bellezze (Marche Polytechnic University)H-Index: 11
Last.Domenico Caputo (University of Naples Federico II)H-Index: 18
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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 con...
#1Luigi Coppola (University of Bergamo)H-Index: 12
#2T. Bellezze (Marche Polytechnic University)H-Index: 11
Last.Domenico Caputo (University of Naples Federico II)H-Index: 18
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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-f...
#1Francesco ColangeloH-Index: 24
#2Giuseppina RovielloH-Index: 17
Last.C.R. Cheeseman (Imperial College London)H-Index: 36
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This research has investigated the properties of thermally insulating geopolymer composites that were prepared using waste expanded polystyrene as lightweight aggregate. The geopolymer matrix was synthetized using metakaolin and an alkaline activating solution. To improve its mechanical properties, this matrix was modified by the addition of an epoxy resin to form an organic-inorganic composite. Moreover, in order to reduce drying shrinkage marble powder was used as an inert filler. The material...
#1Laura RicciottiH-Index: 11
Last.Giuseppina RovielloH-Index: 17
view all 6 authors...
A new class of geopolymer composites, as materials alternative to traditional binders, was synthesized and its potentialities as restoration material in Cultural Heritage has been explored. This material has been prepared through a co-reticulation reaction in mild conditions of a metakaolin-based geopolymer inorganic matrix and a commercial epoxy resin. The freshly prepared slurry displays a consistency, workability and thixotropic behavior that make it suitable to be spread on different substra...
Abstract The present study reports on the preparation and characterization of new organic-inorganic geopolymer based hybrid foams obtained by reacting an aluminosilicate source and an alkalisilicate solution with mixtures of dialkylsiloxane oligomers or organic resins precursors. By using different amounts of Si 0 powder as in situ foaming agent, hybrid geopolymer-based foams with densities ranging from 0.25 to 0.85 g/cm 3 were successfully prepared. These new materials are characterized by rema...
Abstract In this paper fly ash based geopolymer mortars have been prepared and their thermal behavior evaluated in order to assess the suitability of fly ash based alkali-activated binders for thermal energy storage in solar thermal plants. Different parameters, such as binder/aggregate ratio, percentage of fly ash replaced by slag, temperature and curing time, have been changed and optimized using the Design Of Experiments (DOE) approach. In order to estimate the thermal cycling stability of ge...
Abstract The building materials industry is facing relevant challenges in terms of sustainability requirements. The same challenge is expected for other anthropogenic activities such as reservoir management. In this study, in the light of industrial ecology approach, two wastes, namely clayey sediments and water potabilization sludge, generated through reservoir life cycle, were used in a synergistic way in the synthesis of sustainable geopolymer binders. In order to guarantee a productive equil...
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