HYDRATION OF CEMENT PASTE AND ESTIMATION OF STRENGTH DEVELOPMENT OF MORTAR USING FLY ASH

The reaction rates of C3S, C2S and fly ash were examined by proposed XRD method to investigate the strength developing mechanism of fly ash concrete. The strength development of fly ash mortar was examined by specimens and estimated with the reaction rates of C3S, C2S and fly ash by proposed method in this paper. The following observations are made: (1) the larger of surface area of cement, the more of hydration degrees; (2) the pozzolanic reaction degree of fly ash correlates with the calcium hydroxide, is approximately in proportion to the account of calcium hydroxide, and influenced by the liquation of calcium hydroxide; (3) when adding fly ash, the hydration of C2S appears to be retarded, though it has little apparently effect on the hydration of C3S.