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Formation of Cs-compounds by chemical interaction of CsOH and concrete at various temperatures

Luu, V. N. ; 中島 邦久  

Luu, V. N.; Nakajima, Kunihisa

This study investigated the possibility of chemical interaction between concrete/aggregate and cesium hydroxide at high temperatures. CsOH interaction with CaCO$$_{3}$$ in concrete forms water-soluble Cs$$_{2}$$CO$$_{3}$$(H$$_{2}$$O)$$_{3}$$ even at room temperature, whereas CsOH interaction with aluminosilicate minerals in aggregate forms water-insoluble CsAlSiO$$_{4}$$ just above 100$$^{circ}$$C, according to TG/DTA and XRD analyses on the mixture of CsOH and pulverized concrete/aggregate. The results suggest that the formation of Cs$$_{2}$$CO$$_{3}$$(H$$_{2}$$O)$$_{3}$$ would be one of the main trapping mechanisms at shield plugs because CaCO$$_{3}$$ is commonly formed on concrete surfaces and reacts with CsOH at room temperature.

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