Abstract
The ASTM C227 test can be modified to develop performance tests for predicting potential alkali-silica reactivity of both portland and blended portland cements. The two methods of test investigated here differed mainly on the choice of the standard reactive aggregate, one using pyrex and the other a naturally occurring reactive silica. Low water/cement and aggregate/cement ratios were found helpful in accelerating expansion of mortar bars stored at 110F (43C). A 14-day test period was considered by the writers to be adequate for the evaluation of relative alkali-silica reactivity of a cement in the methods developed. Test data in 17 portland cements and 10 blended portland cements are reported to show that for this purpose performance tests may be more suitable than chemical specification limits.
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