Sulfate Attack on Concrete Containing Fly Ashby P. J. Tikalsky, Univ of Texas at Austin, United States,
R. L. Carrasquillo, Univ of Texas at Austin, United States,
Abstract: The use of fly ash as a portland cement replacement in concrete may provide many technical and economic advantages. One such technical advantage is to improve the resistance of concrete to sulfate attack. However, this benefit is not realized with all types of fly ash. Some fly ashes have been shown to reduce the sulfate resistance of concrete and others may have no effect on the durability of concrete in sulfate environments. In order to clarify the effect of fly ash on concrete exposed to sulfates, a study is being conducted using 14 different fly ashes from bituminous, subbituminous and lignite sources. The fly ashes have been catalogued by chemical and crystalline phase composition.
Subject Headings: Fly ash | Sulfates | Recycling | Portland cement | Load and resistance factor design | Material tests | Economic factors
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