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Proprietà acustiche di un nuovo materiale per l’edilizia a base di cemento e poliuretano espanso
No full textThe effect of recycled plastic aggregate on chemico-physical and functional properties of composite mortars
No full textIn this paper the interaction mechanism between recycled plastic aggregates and lime matrix in composite mortars was investigated by means of thermal, morphological and Fourier Transform Infrared Spectroscopy (FTIR) analyses. In order to assess the fire behavior of the composite mortars, a cone calorimeter method was adopted. The plastic aggregate, mainly made of polyolefin and polyethylene terephthalate, is obtained from an industrial waste, through a process that provides a plasticization and densification by extrusion of plastic waste. Several composite mortars were prepared by replacing silica powder with 10%, 15% and 20% of recycled aggregate. Experimental results attest that, even if the filler was not chemically modified, there is a good chemical interaction between the plastic aggregate and mortar, involving a reduction of the negative effects on physical and functional properties of the mortar composites, such as thermal degradation and fire resistance. In fact all the specimens showed a scarce sensitivity to flashover, and can be classified as low risk materials
STABILIZZAZIONE DELLA SCORIA DI SECONDA FUSIONE DEL PIOMBO: RECUPERO ED INERTIZZAZIONE
No full textIn questo lavoro sono state prese in considerazione scorie di seconda fusione del piombo di recupero da batterie per autotrazione esauste. Il rifiuto è pericoloso (CER 10.04.01) e viene prodotto in Italia in quantità pari a 10000 ton/anno. La sperimentazione è stata orientata verso la stabilizzazione per mezzo di matrici cementizie con il duplice scopo di ottenere manufatti riutilizzabili nel settore dei materiali da costruzione con un contenuto massimo di scoria del 30% in peso, nonché prodotti adatti ad un più sicuro smaltimento in discarica con un contenuto di scoria nettamente superiore fino all’85%. I risultati hanno evidenziato che nel primo caso i prodotti hanno proprietà tecnologiche, comportamento al rilascio e caratteristiche di ecotossicità adeguate per il reimpiego previsto. Nel secondo caso è stato dimostrato che, l’incorporazione della scoria in misura pari all’85% nei prodotti stabilizzati, consente uno smaltimento in discarica in piena sicurezza a patto di ottimizzare opportunamente la composizione della matrice legante
Analisi sperimentale dell' efficacia del consolidamento di pozzolana e pomici con soluzioni di silicato di sodio
No full text
The effect of recycled plastic aggregate on chemico-physical and functional properties of composite mortars
No full textIn this paper the interaction mechanism between recycled plastic aggregates and lime matrix in composite mortars was investigated by means of thermal, morphological and FTIR analyses. In order to assess the fire behavior of the composite mortars, a cone calorimeter method was adopted. The plastic aggregate, mainly made of polyolefin and polyethylene terephthalate, is obtained from an industrial waste, through a process that provides a plasticization and densification by extrusion of plastic waste. Several composite mortars were prepared by replacing silica powder with 10, 15 and 20 % of recycled aggregate. Experimental results attest that, even if the filler was not chemically modified, there is a good chemical interaction between the plastic aggregate and mortar, involving a reduction of the negative effects on physical and functional properties of the mortar composites, such as thermal degradation and fire resistance. In fact all the specimens showed a scarce sensitivity to flashover, and can be classified as low risk materials
Removal of Cd(II) from wastewater by sustainable absorber: Composite diatomite-based foams
No full textLightweight TRC sandwich panels with sustainable diatomite-based core for energy retrofitting of existing buildings
No full textPrecast sandwich panels, characterized by external textile reinforced concrete (TRC) layers and an inner insulation core, represent a convenient system for energy retrofitting of existing façades. These elements fulfil all the requirements for façade systems and constitute a valid alternative to both external thermal insulation composite systems (ETICS) and ventilated façades. The main feature of this kind of panel is that it could be applied on an existing façade through four punctual connectors by means of a crane, without any scaffolding. The paper provides a solution that has been firstly designed within the European project ‘EASEE’ and it is now being developed in the ‘Smart P.I.QU.E.R.’ project, supported by Lombardy Region (Italy). Basing on the experience gained in the European project, the partners are trying to overcome some criticisms previously encountered, related to the use of expanded polystyrene as insulation material, the cost of the anchoring system and aesthetical issues related to TRC cracking. The main innovations concern: the development of a new eco-friendly insulation material based on inorganic diatomite; the optimization of TRC layers; the development of a new anchoring system. This paper focuses on the research developed at the material level referring to both external layers and insulating core
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