抄録
Mixture of milk of lime and silica powder was treated hydrothermally up to 191°C (12kg/cm2) and kept for 4hrs in such condition. Products at several steps were examined and the formation process of xonotlite grain was analyzed. Firstly calcium hydroxide and silica powder made fine aggregated lumps partly forming C-S-H (II) and then they changed to combined lumps partly forming C-S-H (I).
At 191°C, they formed spherical shape consisting of tobermorite partly changing to xonotlite. After 4hrs spherical grains consisting of tobermorite and xonotlite were completed. Further treating at 191°C made grains completely xonotlite. The higher treating temperature resulted the faster rate of xonotlite formation.
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