Effect of Curing Temperature and Silicate Concentration on Fly-Ash-Based Geopolymerization
Abstract
The development of the pore structure of geopolymers synthesized from class F fly ash was studied using electron microscopy and porosimetry. Fly-ash-based geopolymer can be classified as a mesoporous aluminosilicate material, with a Si/Al composition varying from 1.51 to 2.24. The Si/Al composition and pore structure of fly-ash-based geopolymer vary depending on the curing temperature and the silicate ratio of the activating solutions (SiO 2 /M 2 O, M = Na or K). A higher Si/Al ratio and finer pores are obtained in geopolymers synthesized at higher temperature and silicate ratios. Elevating the curing temperature increases the extent and rate of reaction, shown through an increase in mesopore volume, surface area, and an accelerated setting time. The kinetics appears to be temperature-controlled only before the material is hardened. Very high silicate ratios (SiO 2 /M 2 O ≥ 2.0) are also believed to slow the reactions. The pore structure of K-based geopolymer is more susceptible to change in temperature than that of Na-based geopolymer.
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In other domains, coal fly ash is considered a forerunner for several applications in adsorption, material synthesis such as zeolites, geopolymers, ceramics, and as a catalyst support.
“In other domains, coal fly ash is considered as a forerunner for several applications in adsorption, 162-164 material synthesis such as zeolites, [165][166][167] geopolymers, 168-170 ceramics, 171,172 and as a catalyst support.[173][174][175]”
From Sustainable hybrid photocatalysts: titania immobilized on carbon materials derived from renewable and biodegradable resources (2016) · cites this paper as [168]
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- Authors
- Sindhunata, van Deventer, J. S. J., Lukey, G. C., & Xu, H.
- Affiliations
- The University of Melbourne (AU)
- Department of Chemical and Biomolecular Engineering, University of Melbourne, Melbourne, Victoria 3010, Australia
- ORCID
- Xu, H.
- Venue
- Industrial & Engineering Chemistry Research
- Publisher
- American Chemical Society (ACS)
- Published
- 2006-04-14
- Volume
- 45
- Issue
- 10
- Pages
- 3559-3568
- ISSN
- 0888-5885 (ISSN-L)
- 1520-5045
- OpenAlex
- W2020413130
- Cited by
- 390
- References
- 37
- Citations by year
- 2026: 27 · 2025: 34 · 2024: 24 · 2023: 27 · 2022: 31 · 2021: 40 · 2020: 30 · 2019: 24 · 2018: 24 · 2017: 24 · 2016: 21 · 2015: 14 · 2014: 19 · 2013: 12 · 2012: 10
- FWCI
- 21.85
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Industrial & Engineering Chemistry Research (publishedVersion)
- Funders
- Australian Research Council
- Topics
- Physical Sciences › Engineering › Civil and Structural Engineering › Concrete and Cement Materials Research
- Physical Sciences › Chemistry › Inorganic Chemistry › Zeolite Catalysis and Synthesis
- Physical Sciences › Earth and Planetary Sciences › Geochemistry and Petrology › Coal and Its By-products
- Keywords
- fly ash geopolymer, Class F fly ash, curing temperature, silicate concentration, pore structure, mesoporous aluminosilicates, Si/Al ratio, alkaline activator, potassium-based geopolymer, setting time, reaction kinetics
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