Effect of admixture on the mechanical properties of an ECC

• 1、School of civil engineering, Zhengzhou University, Zhengzhou 450001

Abstract：The incorporation of admixtures is an important way to improve the performance of concrete. For engineering cementitious composite (ECC), admixtures can also be used to improve the mechanical properties. This paper investigated the existing literature on the effects of admixtures on ordinary concrete, cementitious composite and PVA fibers and selected three kinds of effective admixtures including thickener, static resistance and defoamer. The basic mechanical properties of engineering cementitious composite (ECC) adding different amount of these three kinds of admixtures was investigated. It has been found that thickener can improve the fluidity of the slurry and improve the water retention and cohesiveness of the slurry due to its high chemical activity. The defoamer optimizes the interior and external pore structure of the cementitious composite by eliminating bubbles inside the slurry. The static resistance disperses the fibers uniformly in the cement matrix by eliminating electrostatic interaction among the fibers. Through the trial test, we get the effects of the three admixtures on the mechanical properties of ECC.

Keywords： ECC Thickener Static resistance Defoamer Admixture