Abstract
Drying shrinkage of concrete affects on the deflection, cracking, loss of prestress and so on of concrete member. It is important to predict the effect of drying shrinkage in design due to take the safety, serviceability, durability and so on of concrete structure into consideration. It is, however, difficult to obtain the data of drying shrinkage at the stage of design. Because the specification of concrete or even concrete manufacturer are not selected. Furthermore, it takes much time to obtain the data of drying shrinkage by experiment. That is why the prediction equation for drying shrinkage strain established by experiment data obtained in each country is used in generally.
In this study, the prediction equation of drying shrinkage strain measured by 100×100×400mm prism specimen is proposed by using some data obtained in Japan. The data measured two years ago and the data measured thirty years ago were used. The comparison of these two types of data shows the effect of the quality change of an aggregate on drying shrinkage strain. The new prediction equations proposed in this study includes the effect of type of aggregate by the term of moisture content of aggregate. Furthermore, in the actual structure, the development of drying shrinkage strain becomes slower because of the effect of member size and the ultimate drying shrinkage strain becomes smaller because of the effect of temperature history in curing are shown.
