Extensive reuse of soda-lime waste glass in fly ash-based geopolymers. (10th November 2018)

• Record Type: Journal Article
• Authors: Toniolo, N.; Rincón, A.; Roether, J.A.; Ercole, P.; Bernardo, E.; Boccaccini, A.R.
• Is Part Of: Construction & building materials. Volume 188(2018)
• Page Start: 1077
• Page End: 1084
• Publication Date: 2018-11-10
• Subjects: Geopolymers -- Waste glass -- Fly ash; Building materials -- Periodicals; 624.18
• DOI: 10.1016/j.conbuildmat.2018.08.096
• Languages: English
• ISSNs: 0950-0618

Abstract

Graphical abstract: Highlights: Waste-derived geopolymers synthesized using waste glass instead of sodium silicate. Mechanically competent materials achieved with high incorporation of waste glass. Formation of a geopolymeric gel confirmed by FTIR and EDX analysis. Leaching tests demonstrated sufficient stabilization of heavy metal ions. Abstract: The possibility of extensive incorporation of soda-lime waste glass in the synthesis of fly ash-based geopolymers was investigated. Using waste glass as silica supplier avoids the use of water glass solution as chemical activator. The influence of the addition of waste glass on the microstructure and strength of fly ash-based geopolymers was studied through microstructural and mechanical characterization. Leaching analyses were also carried out. The samples were developed changing the SiO2 /Al2 O3 molar ratio and the molarity of the sodium hydroxide solution used as alkaline activator. The results suggest that increasing the amount of waste glass as well as increasing the molarity of the solution lead to the formation of zeolite crystalline phases and an improvement of the mechanical strength. Leaching results confirmed that the new geopolymers have the capability to immobilize heavy metal ions.