Abstract
After closure of the radioactive waste repository, a cementitious material contacts groundwater and is gradually altered by leaching of component from itself for a long term. Leaching experiments were carried out to investigate effects of silica fume in cement on leaching behavior of cement paste. Chemical composition in leachate and solids before and after experiments were analyzed. Modelling for leaching of cement pastes were carried out by using thermodynamic model of C-S-H gel based on Berner model and the results were compared with experimental results.
