Calcite Precipitation at Cement–Bentonite Interface. Part 2: Acceleration of Transport by an Electrical Gradient

Calcium leaching from cementitious materials in contact with bentonite nuclear waste repositories can alter the functionality of an engineered barrier system. In this study, we contribute to fundamental understanding calcite precipitation at cement–bentonite interfaces by adding carbonate bentonite. addition, accelerate transport charged reactants towards interface using electrochemical migration method. The admixture successfully promotes surface cement paste. analysis also revealed that amount precipitated is not simply correlated added or applied electrical potential. Experiments which pore water contains high initial contents exhibit rapid a very narrow region interface, resulting clogging. This second two papers; system evolution without gradient was discussed first paper. paper extended version English authors’ previous works [Watanabe and Nakarai, (2008). “Effect NaHCO3 on calcium material.” Proc. JCI, 30(1), 717-722. et al., (2010). mixing into 32(1), 713-718. (in Japanese)]