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Report No.

Behavior of fine particle originated from cement

not registered

For the safety assessment of radioactive waste disposal, it is important to elucidate the effect of colloids on radionuclide migration, which are released with dissolution of cementitious materials composing engineered barricr. In the previous work, we identified and characterized the colloidal particles in the solutions contacting cement hydrates, OPC and low-alkaline cement paste, and observed the release of the colloid particle. In the present work, we performed same experiments as the last year to confirm the reproducibility of the colloid release. We studied the leaching behavior of the colloid when OPC and low-alkaline cement past contact water flow. Furthermore, the effect of an alumina particle was studied, which is used as a barrier material for colloid migration. The following conclusions were derived: (1)In the solution contacting cement paste, the small amount of particles, which are considered as CaCO$$_{3}$$ or silicate colloids were observed. Thus, the reproducibility of the last work was confirmed. (2)The leaching of colloid in the solution was confirmed by water flow through the cement paste. The concentration of particle was as low as 10$$^{3}$$$$sim$$10$$^{5}$$ mL$$^{-1}$$. (3)Al$$_{2}$$0$$_{3}$$ powder, with the diameter of 200$$sim$$150$$mu$$m, was found to be effective to some extent as a barrier for a colloid migration from low-alkaline cement paste.



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