Hydration process and microstructure of limestone addition Portland cement

The hydration heat and microstructure of the cement paste,which admixed with limestone powder,were determined by TAM air isothermal calorimeter and SEM respectively. The results showed that the cement hydration could be accelerated with definite fineness of limestone. The hydration heat of the cement paste with limestone admixture was less than that of ordinary Portland cement. A plane and smooth section could be easily formed along the edge of flake calcite crystal of limestone.