HYDRATION OF FLY ASH CEMENT CONTAINING HIGH C₃S CEMENT AT 30℃

Abstract

This paper describes the hydration of fly ash （FA） cement containing ordinary Portland cement （N） or high C₃S cement （H） at 30℃ and the effect of limestone powder （LSP）. The replacement ratio of FA to H or N is 18 or 30 mass％. The heat liberation of FA cement containing H cement as basic cement at early stage is indicated the value more than equal to that of N cement. When LSP is added, Ettringite （AFt） and Monocarbonate （MC） is formed regardless of the basic cement. A reaction rate of C₃S and C₂S in various FA cements indicated an almost equal value. These amounts of hydration are related to the contents of C₃S and C₂S in base cement. The reaction rate of FA in FA cement containing H is increased remarkably at a long term compared with the case of FA cement containing N. It was presumed that the one of the factors the formed reactive layer surrounding fly ash where the transfer of water is easy in FA cement containing H cement.'