Abstract
This paper is intended to study the relationship between the flexural strength or the shrinkage ratio and the curing method or the mixing proportions of the concrete, were influenced such as the admixture, kinds of the cements and the aggregates. As the results, it was found that the concrete have the high flexural strength and the small shrinkage ratio when they were mixed with the silica fume and cured in 60℃ hot water about 6 days. And especially, it was found that the concrete have very high flexural strength and low shrinkage ratio when the cement included more than 0.35% of Na_2O, when the sand-aggregate ratio was more than 60% or when the sand-cement ratio was about 1.6.
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