Reactive transport evaluation of alkaline altered granite

Abstract

In the geological disposal of high level radioactive wastes, cement grout materials are planned to be used for the sealing of fractures. Since they will produce highly alkaline groundwater, alteration of host rocks might occur. In this study, batch alteration experiments of granite blocks and reactive transport simulation were conducted. These results show that C-S-H precipitate on the surface of granite block. The C-S-H formation was considered to be rate-limited by diffusion through granite matrix.