Preparation and research of concrete shrinkage reducing agent

摘要

Through the dispersion performance, surface tension, and concrete performance test of a single shrinkage reduction component, two kinds of shrinkage reduction components with better shrinkage performance were selected for compounding in different proportions to prepare a concrete composite shrinkage reducer P-3. The performance test results show that, the shrinkage reducing agent P-3 can greatly reduce the surface tension of the aqueous solution and has a good shrinkage reduction effect on concrete. When the mixing amount was 0.5%, the 7d concrete shrinkage rate reached 37%, and the 28d shrinkage rate was 35%. The effect of the shrinkage reducing agent on cement slurry hydration was studied by microcalorimeter, and then the mechanism of the shrinkage reducing agent was studied.