This study was examined the variation of unit water content and fine aggregate ratio in concrete for nuclear power structure using a large amoung of crushed sand.

Dry shrinkage of concrete is occurred due to the cement hydration and water evaporation from early ages, and it induces crack of concrete. In this study, shrinkage according to sand-aggregate and water-binder ratio were compared with the existing prediction models. From the results, when sand-aggregate ratio and unit water content increase, dry shrinkage of concrete increase. But, it showed that existing prediction models do not reflect shrinkage of concrete, well.