Performance Evaluation of Buffer and Backfill Material Made of Bentonite
Date Issued
2014
Date
2014
Author(s)
Cheng, Bai-Hung
Abstract
Applications of nuclear power and atomic energy are becoming more and more extensive all around the globe in recent years, bringing about technological advancements and conveniences that benefit Taiwan and many other countries. However, perfection is hard to attain－problems about disposal of those hazardous radioactive pollutants have begun to surface. To find a solution for radioactivity isolation and long-term storage of the waste has become a serious issue. According to some overseas cases of final radwaste disposal site, people adopt a measure designed by the concept of multiple barrier. It basically takes on multi-protection, using artificial engineering barrier and natural barrier to keep human living environments free of radioactive waste; in the meantime, it makes sure that the radioactivity reduces to an innocuous level. The performance of buffer and backfill material made of different materials plays a crucial role in research on engineering barrier.
In this research, bentonite of Wyoming imported from the US and Zhishin clay produced in Taiwan were mixed with granite from Kinmen and argillite from Taitung with different ratios and compaction energy, and were further made into buffer and backfill materials. To determine the factors that affect performance of buffer and backfill material, tests for material characteristics, swelling rate, swelling pressure and hydraulic conductivity were performed. The results of this research found out that under the same conditions, bentonite of Wyoming outperformed Zhishin clay in both swelling rate and water resistance; the results also provided a way of evaluating the swelling characteristics of buffer and backfill material made of mixture of bentonite of Wyoming and Zhishin clay.
Subjects
放射性廢棄物
緩衝回填材料
水力傳導度
膨脹壓力
膨脹率
Type
thesis
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