Research on influence of admixtures to the plastic shrinkage cracking of mortar

Abstract

In this paper, the influence of admixture on plastic shrinkage cracking was studied. The results show that the plastic tensile strength increases while plastic shrinkage stress decreases as the content of air-entraining agent grows to 150×10-6 wt.%, and the anti-cracking index increases as a whole. Water reducing agent, water retaining agent, and shrinkage reducing agent all have the effect of improving plastic shrinkage cracking of fresh cement mortar. The constitutive relations between the admixtures content and anti-cracking index have been built.