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Report No.
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Mineralogical changes of cement and bentonite accompanied with their interactions

Hoshino, Seiichi; Yamaguchi, Tetsuji ; Maeda, Toshikatsu; Mukai, Masayuki ; Tanaka, Tadao ; Nakayama, Shinichi 

In this study, the cement-bentonite alteration reaction was accelerated by using granulated hardened cement paste, bentonite and water, where the mixtures of 1:1:5 in weight were aged for 365 days. Mineralogical changes of cement and bentonite were observed by XRD. Hydrated calcium-silicate phases (C-S-H), portlandite, ettringite and monosulfate were identified in the unreacted cement. Portlandite and monosulfate decreased with aging and disappeared by 115 day. Calcite and katoite were generated during the ageing. The unreacted bentonite was composed of montmorillonite, quartz, clinoptilolite, plagioclase, calcite, analcime and pyrite. All of these minerals decreased with aging. It seems that these primary minerals dissolved in the course of the reaction. C-S-H appeared during alteration as secondary phase. The formation of C-S-H has been predicted by previous modeling studies, and the prediction was supported by the present accelerated alteration experiments.

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