Abstract
Portland cement-free high-volume waste glass geopolymer composite is proposed for the upcycling of glass waste. The “high-volume” is achieved by utilizing GP as the geopolymer precursor and glass cullet as the aggregate. Our observations show decent strength and durability can be obtained by the composites with up to ∼83 wt% waste glass by the mass of solid components. GP and common geopolymer precursors (class C and class F fly ash and slag) have synergistic effects on forming calcium-(sodium-)aluminosilicate hydrate (C-(N-)A-S-H) and sodium-aluminosilicate hydrate (N-A-S-H). A higher Ca content and dosage of Na2O, however, lead to a larger drying shrinkage. Although glass aggregate can reduce the shrinkage to some extent, the highly reactive aggregate may cause the progressive ASR in the Ca-rich mixtures. The ASR expansion decreases with the increasing dosage of Na2O possibly because an overly high pH in pore solution thermodynamically hindered the precipitation of ASR gels and/or a higher alkaline concentration favors the dissolution of aggregate surfaces at curing stage, and the dissolved Si participates in the hydration process.
Original language | English |
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Article number | e00890 |
Journal | Sustainable Materials and Technologies |
Volume | 40 |
DOIs | |
Publication status | Published - Jul 2024 |
Keywords
- Alkali-silica reaction (ASR)
- Geopolymer
- Glass aggregate
- Shrinkage
- Thermodynamic simulation
- Waste glass
ASJC Scopus subject areas
- Renewable Energy, Sustainability and the Environment
- General Materials Science
- Waste Management and Disposal
- Industrial and Manufacturing Engineering