EFFECT OF SLOWLY COOLED BLAST FURNACE SLAG POWDER ON FLOWABILITY AND ITS MECHANISM

摘要

It was clarified that the slowly cooled last furnace slag powders were excellent in flowability retention performance as the fineness increased. Therefore, by giving fineness as an input signal, the flowability retention effect can be adjusted. Thiosulfate ion is dissolved from the slowly cooled blast furnace slag powder. It was been proven that this thiosulfate ion more remarkably interferes the initial hydration of C_3A than the sulfate ion that is added as gypsum. On the other hand, it has also been clarified that thiosulfate ion does not interfere the hydration of Alite, which has a role of strength enhancement. The slowly cooled blast furnace slag powder can be defined as intelligent materials that can sense input or target.