Impact of Alkali Silica Reaction on Fly Ash-Based Geopolymer Concrete
Publication: Journal of Materials in Civil Engineering
Volume 25, Issue 1
Abstract
This study reports the findings of an experimental investigation for alkali silica reaction (ASR) between reactive aggregates and the geopolymer matrix. Specimens were prepared using one Class C and two Class F fly ash stockpiles. Mechanical testing included potential reactivity of the aggregates via length change and compression test measurements, as per ASTM standards. Results suggest that the extent of ASR reaction due to the presence of reactive aggregates in fly ash-based geopolymer concretes is substantially lower than in the case of ordinary portland cement-based concrete, and well below the ASTM specified threshold. Furthermore, geopolymer concrete specimens appeared to undergo a densification process in the presence of alkali solutions, resulting in reduced permeability and increased mechanical strength. Utilizing ASR-vulnerable aggregates in the production of geopolymer concrete products could contribute to the economic appeal and sustainability of geopolymer binders in regions that suffer from insufficient local supply of high quality aggregates.
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Information
Published In
Journal of Materials in Civil Engineering
Volume 25 • Issue 1 • January 2013
Pages: 131 - 139
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Nov 15, 2011
Accepted: May 11, 2012
Published online: May 15, 2012
Published in print: Jan 1, 2013
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