Abstract
The compacted bentonite and sand-bentonite mixture are attracting greater attention as buffer and backfill materials for high-level nuclear wastes disposal because they have impermeable and swelling properties. This study investigated the hydraulic-conductivities at the different sand-bentonite mass ratio and dry density, which are the specifications of material, by the experimental works. This study also obtained the experimental data of hydraulic conductivities of the materials for 120 days at the farthest, and the permeability changes before and after swelling. Furthermore, this study proposed the evaluation method for hydraulic conductivity using the parameter “Swelling volumetric strain of montmorillonite”, which was proposed by the authors.
