Multi-scale performance evaluation of damaged buffer material made by bentonite-silica sand mixture

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Performance of the damaged bentonite-silica sand mixture, which is used as a buffer material for the radioactive waste disposal, has been evaluated. From the results of the direct shear test and the triaxial test, which were carried out to grasp the change of mechanical properties of buffer material with various degree of saturation, it was shown that the shear strength and dilatancy property rapidly changed with changing the degree of saturation. Furthermore, the change of density due to shearing in the damaged buffer material specimen was not able to be observed by the m-XCT. Macroscopic permeability test was also conducted to confirm the maintaining of the sealing performance of the buffer material after shearing.