Abstract
In the design for buffer and backfill materials for repositories of high-level nuclear waste, we must choose the adequate bentonite among many kinds of bentonite in the world. To select the adequate bentonite, we have to get the fundamental properties such as seepage and swelling of many kind of bentonite. To solve this problem, the study proposed the new simplified experimentation using measuring cylinder and new analysis method for seepage and swelling properties. We investigate the validity of new method by the laboratory tests using five kinds of bentonite. Furthermore, this study describes the influences of water-chemistry to the seepage and swelling properties of bentonites on the basis of the experimental data obtained by new method.
