Glass-Ceramic Foams from "Weak Alkali Activation' and Gel-Casting of Waste Glass/Fly Ash Mixtures
Romero AR, Toniolo N, Boccaccini AR, Bernardo E (2019)
Publication Type: Journal article, Original article
Publication year: 2019
Journal
Book Volume: 12
Article Number: 588
Journal Issue: 4
DOI: 10.3390/ma12040588
Abstract
A weak alkali activation' was applied to aqueous suspensions based on soda lime glass and coal fly ash. Unlike in actual geopolymers, an extensive formation of zeolite-like gels was not expected, due to the low molarity of the alkali activator (NaOH) used. In any case, the suspension underwent gelation and presented a marked pseudoplastic behavior. A significant foaming could be achieved by air incorporation, in turn resulting from intensive mechanical stirring (with the help of a surfactant), before complete hardening. Dried foams were later subjected to heat treatment at 700-900 degrees C. The interactions between glass and fly ash, upon firing, determined the formation of new crystal phases, particularly nepheline (sodium alumino-silicate), with remarkable crushing strength (6 MPa, with a porosity of about 70%). The fired materials, finally, demonstrated a successful stabilization of pollutants from fly ash and a low thermal conductivity that could be exploited for building applications.
Authors with CRIS profile
Nicoletta Toniolo
Lehrstuhl für Werkstoffwissenschaften (Biomaterialien)
Aldo Boccaccini
Lehrstuhl für Werkstoffwissenschaften (Biomaterialien)
Involved external institutions
Italy (IT)How to cite
APA:
Romero, A.R., Toniolo, N., Boccaccini, A.R., & Bernardo, E. (2019). Glass-Ceramic Foams from "Weak Alkali Activation' and Gel-Casting of Waste Glass/Fly Ash Mixtures. Materials, 12(4). https://dx.doi.org/10.3390/ma12040588
MLA:
Romero, Acacio Rincon, et al. "Glass-Ceramic Foams from "Weak Alkali Activation' and Gel-Casting of Waste Glass/Fly Ash Mixtures." Materials 12.4 (2019).
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