Waste glass as partial mineral precursor in alkali-activated slag/fly ash system

S. Zhang, A. Keulen, K. Arbi, G. Ye

Research output: Contribution to journalArticleAcademicpeer-review

37 Citations (Scopus)

Abstract

The feasibility of a waste glass powder residue (GP) from glass recycling as partial mineral precursor to produce alkali-activated materials is investigated. GP served as powder coal fly ash (PCFA) replacement within a reference system composed of 50% PCFA and 50% ground granulated blast furnace slag (GGBS). Compared with PCFA, GP was better involved in the alkali activation process by having a higher silica and Ca dissolution. Furthermore, increasing GP replacement up to 30% prolonged the induction period, facilitated the gel formation and yielded a 35% higher 28-day compressive strength. These observations are similar to the effect of using both sodium hydroxide and sodium silicate as alkali activator in alkali-activated slag/fly ash systems. A higher polymerization of the gel network was also observed. Microstructure analysis indicated that the main reaction product is a calcium silicate hydrate type gel substituted with Al and Na (C-(N)-A-S-H type gel). This work largely contributes to the understanding of the reactivity and potential of GP and promotes its practical utilization as a mineral precursor in the production of alkaline cements.

Original languageEnglish
Pages (from-to)29-40
Number of pages12
JournalCement and Concrete Research
Volume102
DOIs
Publication statusPublished - 1 Dec 2017

Keywords

  • Alkali activated material
  • Fly ash
  • Microstructure
  • Slag
  • Waste glass

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