2020 Volume 26 Issue 62 Pages 13-18
In order to predict the tensile stress generated by drying-shrinkage, the influence of member thickness, ranging from 50 to 400 mm, on the drying-shrinkage was experimentally investigated on a set of specimens for 19 years. The effective thickness of concrete members was obtained by using diverse concretes of different drying-shrinkage rates, which depended on the mix proportions of concrete, such as unit water content, use of chemical admixture, and type of aggregate used, etc. As a result, it was found that, within each concrete type, the difference in the amount of shrinkage between members of different thicknesses and causing generation of tensile stresses depended on the drying-shrinkage rate and showed a decreasing tendency over time. Furthermore, even when the drying-shrinkage rates were different, the ratio of the drying-shrinkage strain by member thickness hardly changed. These observed tendencies were predicted relatively well using the corrected Rush’s ks value.
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