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Geomechanics and Engineering Volume 34, Number 4, August25 2023 , pages 449-459 DOI: https://doi.org/10.12989/gae.2023.34.4.449 |
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Physio-mechanical and X-ray CT characterization of bentonite as sealing material in geological radioactive waste disposal |
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Melvin B. Diaz, Sang Seob Kim, Gyung Won Lee, Kwang Yeom Kim,
Changsoo Lee, Jin-Seop Kim and Minseop Kim
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| Abstract | ||
| The design and development of underground nuclear waste repositories should cover the performance evaluation of the different components such as the construction materials because the long term stability will depend on their response to the surrounding conditions. In South Korea, Gyeonju bentonite has been proposed as a candidate to be used as buffer and backfilling material, especially in the form of blocks to speed up the construction process. In this study, various cylindrical samples were prepared with different dry density and water content, and their physical and mechanical properties were analyzed and correlated with X-ray CT observations. The main objective was to characterize the samples and establish correlations for non-destructive estimation of physical and mechanical properties through the utilization of X-ray CT images. The results showed that the Uniaxial Compression Strength and the P-wave velocity have an increasing relationship with the dry density. Also, a higher water content increased the values of the measure parameters, especially for the P-wave velocity. The X-ray CT analysis indicated a clear relation between the mean CT value and the dry density, Uniaxial Compression Strength, and P-wave velocity. The effect of the higher water content was also captured by the mean CT value. Also, the relationship between the mean CT value and the dry density was used to plot CT dry densities using CT images only. Moreover, the histograms also provided information about the samples heterogeneity through the histograms | ||
| Key Words | ||
| bentonite; buffer material; dry density; EBS; X-ray | ||
| Address | ||
| Melvin B. Diaz, Sang Seob Kim and Gyung Won Lee, Kwang Yeom Kim: Department of Energy and Resources Engineering, Korea Maritime and Ocean University, 727, Taejongro, Yeongdo-gu, Busan, 49112, Republic of Korea Changsoo Lee, Jin-Seop Kim and Minseop Kim: Radioactive Waste Disposal Research Division, Korea Atomic Energy Research Institute, 111 Daedeok-dero 989 Beon-gil, Yuseong-gu, 34057, Republic of Korea | ||