Romero AR, Toniolo N, Boccaccini AR, Bernardo E (2019)
Publication Type: Journal article, Original article
Publication year: 2019
Book Volume: 12
Article Number: 588
Journal Issue: 4
DOI: 10.3390/ma12040588
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.
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://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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