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

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

Zhang, Shizhe (TU Delft Materials and Environment)
Keulen, Arno (Van Gansewinkel Minerals; Eindhoven University of Technology)
Arbi Ghanmi, K. (TU Delft Materials and Environment)
Ye, G. (TU Delft Materials and Environment)

2017-12-01

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.

Alkali activated material
Fly ash
Microstructure
Slag
Waste glass

http://resolver.tudelft.nl/uuid:de1da970-7f88-4a6c-b28a-025635c662c0

https://doi.org/10.1016/j.cemconres.2017.08.012

2019-10-18

0008-8846

Cement and Concrete Research, 102, 29-40

Institutional Repository

journal article

© 2017 Shizhe Zhang, Arno Keulen, K. Arbi Ghanmi, G. Ye