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Effect of curing time on dry shrinkage of concrete with different binder and water binder ratio

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Document pages: 10 pages

Abstract: Plain cement concrete, ground slag (GGBS) concrete and fly ash concrete are designed. Three wet curing periods are adopted, which are 2, 5 and 8 days respectively. The dry shrinkage value of concrete shall be measured within 1 year after wet curing. The results show that regardless of the wet curing time, the later dry shrinkage growth rate of mineral admixture concrete is higher than that of ordinary cement concrete. With the shortening of wet curing time, the total dry shrinkage increment of concrete decreases with the decrease of water cement ratio. The negative effect of shortening wet curing time on the dry shrinkage of fly ash concrete is more obvious than that of slag concrete and plain cement concrete. Sippingrfine ground granulated blast furnace slag (SGGBS) can reduce the drying shrinkage of GGBS concrete and fly ash concrete when the wet curing time is insufficient.

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