水泥基体参数对砂浆塑性收缩开裂性能的影响

Effects of Parameters of Cement Matrix on the Plastic Shrinkage Cracking

摘要:

研究了水泥基材料基体参数对砂浆塑性收缩开裂性能的影响，结果表明：水泥品种不同，砂浆的塑性开裂性能不同；水泥标号增大，砂浆的塑性开裂也将加大；存在使砂浆塑性开理解最大化的水比；灰砂比越小，砂浆的抗塑性开裂性能越好；粗细集料、外加剂种类、混合料品种及掺量也对砂浆的塑性开裂性能有很大影响。

Abstract:

In this paper, the effects of some basic parameters of cement matrix, such as kinds of cement, strength grade of cement, water cement ratio, cement sand ratio, fineness modulus of sand, coarse aggregate, admixture and additive, on the plastic shrinkage cracking of the cement mortar or concrete slabs were investigated. The test results indicate that different kinds of cement show different effects on the plastic shrinkage cracking; the total weighted cracking value increases with increasing strength grade of cement; the relation between water cement ratio and plastic shrinkage cracking does not show the linearity; with more sand in the mixture, the ability to resist the plastic shrinkage cracking is stronger, the class of fly ash, the amount of fly ash and silica fume added, the kinds of additives could also impose different influences on the ability to resist the plastic shrinkage cracking.