Hydrothermal reaction mechanism of silica sand contains some impurities with lime

Abstract

The hydrothermal reaction of slaked lime and silica sand containing feldspar and clay minerals as impurities have investigated. It was found that the flexural strength of the solidified bodies increased with increasing treatment temperature and time and was proportional to the amount of reaction products but independent of their type. Hydrogarnet and C-S-H were formed in the initial stages of reaction as precursors of 1.1 nm tobermorite and the amount of these phases tended to decrease and 1.1 nm tobermorite formed as the reaction progressed further. And the reaction was controlled by the diffusion of Si fraction from kinetic study.