Abstract
The cement paste adhering to recycled aggregate increases the unit weight of water and reduces the confinement effect of aggregate. Therefore, the authors presented a method to estimate the increase in unit weight of water and the reduction of the confinement effect of aggregate by means of regression analyses using data in references. Next, a formula to predict dry shrinkage for concrete made with recycled coarse aggregate, based on the JSCE prediction formula for normal concrete, was developed by taking into account the increase in unit weight of water and the reduction of the confinement effect of aggregate. Since the proposed method does not require any tests to estimate the characteristics of the cement paste adhering to recycled aggregate, it allows easy calculation of shrinkage strain. As a result of verification using prior experimental results, it was concluded that the predicted value of dry shrinkage of recycled concrete has sufficient precision comparable to that of the prediction of dry shrinkage of normal concrete using the JSCE prediction formula.
