Effect of Fine Aggregate Particle Size on Mortar Shrinkage Properties

Abstract

The materials used and mix proportion for repair materials differ depending on the required performance such as shrinkage. In general, repair materials have a lower water-cement ratio than regular ready-mixed concrete. In addition, the particle size of the fine aggregate used for repair materials has been adjusted in consideration of workability. Aggregate has the effect of restraining the shrinkage of cement-based materials. Although the effect of coarse aggregate size on the shrinkage characteristics of concrete has been reported, the effect of fine aggregate size on the shrinkage characteristics of mortar has hardly been investigated. Therefore, we investigated the effect of the particle size of the fine aggregate on the autogenous shrinkage and drying shrinkage of the mortar with W/C=35% assuming the repair materials. As a result, it was clarified that the particle size of fine aggregate affects the autogenous shrinkage strain and drying shrinkage strain of mortar. In the range of S/C=1-1.5, it was clarified that the larger the F.M., the smaller the autogenous shrinkage strain. It was also clarified that the larger the S/C and the larger the FM, the smaller the drying shrinkage strain tends to be.