Effectiveness of combined nanoadditives for cement systems

Abstract

We have developed a process for the sol–gel synthesis of a SiO₂-based combined additive in the presence of superplasticizers and investigated the hydration kinetics, phase composition, microstructure, and strength characteristics of a modified cement stone. The results demonstrate that combined nanoadditives accelerate hydration processes, without significantly changing the structure of the modified cement stone. The observed strength gain in the samples is due to the rapid accumulation of cementitious substance during the hardening system formation process. The results of a detailed study of modified cement systems have been used to optimize the composition of the combined additive.