Effects of High-volume Limestone Powder on Cement Hydration

摘要

Due to technical, economic, environmental and other factors, roller compacted concrete often requires a large amount of powder. Limestone rocks are widely distributed in China. It is easy to-grind and process them into limestone powder with low energy consumption. In this paper, DTTA, XRD, SEM & EDS, TQ DTA and other testing methods were used to study the effects of large-dosage limestone powder on cement hydration. The results showed that limestone powder can act as nucleation for hydration products, and thus accelerate cement hydration, providing favorable interface bonding. At the same time, Limestone powder participates in the hydration reaction of cement to form calcium carboaluminate hydrate.