Abstract
Th objective of this study was to examine the effects of adjusting gypsum contents in blended, interground, fly ash cements. The adjustments in gypsum content were expected to affect sulfate resistance of the concrete by increasing the availability of sulfate ions during the hydration of calcium aluminates. In addition to studying the effects of gypsum content on sulfate resistance, its effects on mixing water requirements, compressive strength, and permeability were observed. The sulfate resistance of concrete containing Type II cement and high-calcium fly ash was improved by increasing the total gypsum content of the blended cements. The increases also caused increased mixing water requirements and decreased compressive strengths. The permeability of concrete was not affected significantly. The blended cement containing one of the two high-calcium fly ashes was particularly effective in improving the sulfate resistance with the increased gypsum contents.
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