HYDRATION OF CALCIUM SILICATE COMPOUNDS C ONTAINING CHLORINE

This paper discusses the hydration and hydration products of calcium s ilicate compound containing chlorine (called alinite) compared with th e case of alite with or without CaCl2. Alinite is a main compound for the production of the cement with chlorine and alite is a main compoun d of ordinary Portland cement. Heat of early hydration was measured by conduction calorimeter. The rate of heat liberation of alite with or without CaCl2 at early stage of hydration has an induction period. But the induction period of alinite was not observed. Reaction ratio of a linite and alite was measured by XRD at late stage of hydration. The h ydration ratio of alinite are larger than that of alite cured for 1 or 3 days. The hydration ratios of alite and alinite cured for 28 days w ere respectively about 80%. The production amounts of Ca(OH)(2) for al ite were larger than that of alinite. The CaO/SiO2 ratio of calcium si licate hydrates in hardened alinite was greater than that of in harden ed alite. In the case of alinite, calcium silicate hydrates included c hlorine, and the ratio of Cl/SiO2 for hydrated products was 0.3.