Abstract
The objective of this study is to confirm the reduction effect of fly ash on autgenous shrinkage of high performance concrete. In this paper, we deal with the influence of admixtures on autogenous shrinkage of massive model specimens which were made from highly workable concrete. We measured strain of concrete and reinforcing rots, and compressive strength which were cured at standard condition. From these results we calculated tensile stress-strength ratio of highly workable concrete. The reduction effect of fly ash on autogenous shrinkage was observed, but fly ash also reduced strength development of concrete. As a result, the stress-strength ratio of fly ash concrete didn't become lower remarkably, but with expansion producing admixture, it became lower remarkably.
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