水泥水化机理及聚合物外加剂对水泥水化影响的研究进展

Recent Development on Understanding Cement Hydration Mechanism and Effects of Chemical Admixtures on Cement Hydration

水泥水化过程决定水泥基材料强度、耐久性等诸多性能。深入理解水泥水化机理对提高水泥基材料性能,解决水泥混凝土工程应用问题十分必要。有机化合物或聚合物作为外加剂在混凝土工业中广泛应用,使传统的水泥–水两相体系转变为水泥–有机高分子–水的三相体系,将相应的水泥水化物理化学称之为"有机水泥化学"。本文简要回顾了各阶段水泥水化机理的最新研究进展,重点综述了有机化学外加剂对水泥水化的影响及其作用机理,提出络合作用与吸附作用是决定有机外加剂对水泥水化影响的主要因素。

Cement hydration is a key process to determine most properties of cementitious materials. The deep understanding on cement hydration can be thus favorable for the improvement of the overall properties of cementitious material, providing solutions to the technical problems in concrete applications. As the extensive application of organic admixtures in concrete and mortar, the reaction during cement hydration changes from cement-water interaction to cement-organic chemicals-water interaction. The concept of ＂organic cement chemistry＂ was proposed. Recent development on cement hydration mechanism at different stages was reviewed. The effects of organic admixtures on cement hydration were discussed. It is indicated that the adsorption of polymer on the surface of cement grains and the complexation of polymers with different ions in aqueous phase or cement grains are the key factors to determine the effect of organic polymer on cement hydration.