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Alkaline dissolution behavior of montmorillonite under compacted condition

Sawaguchi, Takuma ; Kadowaki, Mitsushi*; Yamaguchi, Tetsuji ; Mukai, Masayuki ; Tanaka, Tadao 

The dissolution rate for montmorillonite under compacted condition was studied in order to evaluate long-term alteration behavior of bentonite buffer materials by highly alkaline groundwater. The dissolution rate of compacted montmorillonite was found to be larger than that of montmorillonite in compacted sand-bentonite mixtures at 130 $$^{circ}$$C, which revealed that the dissolution of montmorillonite was inhibited by decreasing the activity of hydroxide ions (${it $alpha$$_O$$_H$$^-$}$) in the compacted mixtures including accessory minerals such as silica. In order to provide reliability for the analysis of bentonite-alteration using a formula of dissolution rate of montmorillonite, it is important to quantify the decrease of ${it $alpha$$_O$$_H$$^-$}$ in the compacted mixtures and to formulate the dissolution rate of compacted montmorillonite.

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