Preparation of nano-calcium silicate hydrate and its application in concrete

Abstract

The calcium silicate hydrate (C-S-H) is the most important hydration product of cement hydration and the most critical source of strength for concrete. In this paper, nano-calcium silicate hydrate was synthesized by sol-gel method. The results show that the nano-calcium silicate hydrate prepared by high-speed stirring and under the action of specific dispersant solution at 40 °C has the smallest particle size and the best dispersion. The early strength of concrete can be improved by adding nano-calcium silicate hydrate as early strength agent. It can reduce its nucleation energy barrier, promote cement hydration, thereby significantly shortening the setting time of concrete, and greatly improving the compressive strength and flexural strength.