Production of sodium silicate powder from waste glass cullet for alkali activation of alternative binders

Raffaele Vinai, Marios Soutsos

Research output: Contribution to journalArticle

17 Citations (Scopus)
121 Downloads (Pure)

Abstract

A simple process to produce sodium silicate powder from glass cullet has been developed. A mixture of glass powder, sodium hydroxide powder, and water was heated at temperatures of 150 to 330 °C. The effects of glass to NaOH ratio, temperature and duration, inclusion of water and fineness of NaOH were investigated. Fly ash and fly ash/GGBS blends were the precursors for alkali activated binder (AAB) mortars produced with this sodium silicate. Compressive strengths were similar to or better than those obtained with commercially available sodium silicate and sodium hydroxide solutions. FT-IR tests suggested that the reactivity of the glass derived sodium silicate powder was related to the number of non-bridging oxygen atoms in the silicate structure. Cost comparison between AAB and Portland cement concretes gave similar results for normal strength concretes (35 MPa). AAB concretes with higher strengths (50 and 70 MPa) can be cheaper than equivalent traditional concrete.
Original languageEnglish
Pages (from-to)45-56
Number of pages12
JournalCement and Concrete Research
Volume116
Early online date13 Nov 2018
DOIs
Publication statusPublished - Feb 2019

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