| Summary: | 碩士 === 國立中央大學 === 土木工程研究所 === 94 === Abstract
Buffer materials are used to separate the migration of radionuclides emitted from high level wastes in a repository. Bentonite is the primary candidate for the buffer materials at present. The uniaxial compaction method is generally used to produce the bentonite blocks over the world. Since a density within the block is not even by the influence of the wall friction forces during the compaction period and then influenced the quality of buffer blocks. At the same time, a large number of montmorliionites is included into bentonite so that the clay materials of bentonite become high plasticity and expansion. Therefore, the direct method is used to find out the compaction behavior of bentonite in cases of different water content during the compaction test in the study.Compression curves of bentonite in different water contents are unable to represent real behavior of bentonite affected by the wall friction force. In the study, “Aspect ratio method” by Guo (2004) and “Integral average method” by Wu (2005) are used to obtain friction-free compression curve of bentonite in different water contents to represent real behavior of bentonite. Finally, the model by Tien et al. (2004) is used to predict compression equations of bentonite-crushed rock mixtures in this study with different granite and slica sand fractions in different weight ratios.
Keywords：Buffer material, bentonite, wall friction force, friction-free compression curve, bentonite-curshed rock mitxures
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