Research on the Effect of Stone Powder Replacing Cementitious Materials on Shrinkage and Deformation of Self-compacting Concrete
Shrinkage deformation is one of the important characteristics of concrete durability and volumetric stability,and when mechanism sand is used to formulate Self-Compacting Concrete(SCC),the stone powder in the mechanism sand will have a certain effect on the shrinkage of concrete.There are fewer studies on the substitution rate of stone powder on the shrinkage and deformation of Self-Compacting Concrete.In this paper,stone powder is used to replace the cementitious material to design the proportion,and the compressive strength,flexural strength,early age shrinkage,28 d autogenous shrinkage and 28 d drying shrinkage tests are carried out on the Self-Compacting Concrete with the substitution amount of stone powder of 0%,21%and 48%,respectively.The results show that the compressive strength and flexural strength of Self-Compacting Concrete will decrease with the increase of stone powder substitution,the early age shrinkage increases and then decreases with the increase of stone powder substitution,and the stone powder can reduce the total shrinkage and autogenous shrinkage at all ages in 28 d,but it will increase the drying shrinkage.
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