抄録
Quantitative analysis had been performed on the hydration of portland cement partly replaced by slowly cooled blast furnace slag powder (CFS), by means of powder XRD determination. The early hydration of alite was accelerated because of the fine powder effect weaker than that of lime stone powder. The hydration products were CSH, CH, AFt and AFm, and the amount of formed CH was smaller than the case without CFS, suggesting the formation of CSH with higher CaO/SiO2 ratio as in portland cement with lime stone powder. The reaction of C3A was remarkably retarded probably by thiosulfurec ion dissolved from CFS. The formed Afm contained thiosulfuric ion in interlayer space. It was supposed that the retardation of C3A hydration contributed to the improvement of flowability retention performance by CFS replacement.
