放射性廃棄物処分(2)

[CS12-16] Basal space evolution of montmorillonite during development of swelling pressure of compacted bentonite

〇Hailong Wang¹, Hideo Komine², Yasutaka Watanabe³ (1.Waseda University, Global Center for Science and Engineering, 2.Waseda University, Faculty of Science and Engineering, 3.Central Research Institute of Electric Power Industry)

Keywords:bentonite, Geological disposal, swelling pressure, X-ray diffraction , Basal space

Bentonite is considered to be a candidate for buffer material in geological disposal of high level radioactive waste. This study presents experimental results of basal space evolution of montmorillonite and swelling pressure during wetting compacted bentonite. Kunigel V1 was used to prepare 2 mm-thick specimens with different dry density. Specimens were installed in a newly developed XRD_swelling pressure apparatus, where a pressure sensor was installed to measure swelling pressure and a parallel X-ray beam was used to scan specimens before and after wetting specimens. Measured swelling pressure and X-ray profiles were reported in this paper.