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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: Effect of Fly Ash Composition on Sulfate Resistance of Cement
Author(s): P. K. Mehta
Publication: Journal Proceedings
Appears on pages(s): 994-1000
Keywords: blended cements; calcium; cement pastes; ettringite; fly ash; sulfate resistance; x-ray diffraction.
Abstract:A laboratory investigation involving 16 fly ash samples of varying calcium content was undertaken with the objective of further clarifying the relationship between fly ash composition and sulfate resistance. A Type I portland cement was used to prepare blended cements containing 25 or 40 percent fly ash by weight. The resistance to sulfate attack was evaluated by immersion of well-cured neat cement paste specimens in a standard sulfate solution for a given period and by determining the strength loss as a result of sulfate exposure. The results show that rather than the chemical composition or the R-factor of a fly ash, it is the mineralogical composition of the cement-fly ash interaction product that controls the sulfate resistance.
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