Linear thermal expansion behavior of compacted bentonite buffer materials
In a geological repository system, buffer is indispensable to ensure the safe disposal of high-level radioactive waste (HLW). Because heat generated from spent nuclear fuel in a canister is released to the surrounding buffers, thermal properties of such materials are fundamental in determining the o...
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| Format: | Article |
| Language: | English |
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Elsevier
2022-04-01
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| Series: | Case Studies in Thermal Engineering |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2214157X22001356 |
| _version_ | 1828898583856807936 |
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| author | Seok Yoon Gi-Jun Lee Gyu-Hyun Go |
| author_facet | Seok Yoon Gi-Jun Lee Gyu-Hyun Go |
| author_sort | Seok Yoon |
| collection | DOAJ |
| description | In a geological repository system, buffer is indispensable to ensure the safe disposal of high-level radioactive waste (HLW). Because heat generated from spent nuclear fuel in a canister is released to the surrounding buffers, thermal properties of such materials are fundamental in determining the overall disposal safety. Specifically, given that thermal expansion causes thermal stress to canisters and intact rock masses in the near-field location, it is imperative to evaluate the thermal expansion characteristics of the buffer, particularly when bentonite is used. This study investigates the linear thermal expansion properties of Kyeongju bentonite buffer, a type of Ca-bentonite produced in South Korea. The linear thermal expansion coefficient of dried bentonite was measured considering the heating rate, dry density, and temperature variation using dilatometer equipment. The linear thermal expansion coefficient values of the KJ bentonite buffers were found to be 4.0–6.2 × 10⁻⁶/°C. Based on test results, a numerical analysis was conducted, and the thermal strain values were similar between the test and numerical analysis. The overall linear thermal expansion coefficient of the KJ bentonite, considering radially confined or unconfined conditions and dried or saturated states, was predicted to be between 3.2 × 10⁻6/°C and 1.0 × 10⁻5/°C. |
| first_indexed | 2024-12-13T15:17:52Z |
| format | Article |
| id | doaj.art-d314607781d044b68d8122b08bc77619 |
| institution | Directory Open Access Journal |
| issn | 2214-157X |
| language | English |
| last_indexed | 2024-12-13T15:17:52Z |
| publishDate | 2022-04-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Case Studies in Thermal Engineering |
| spelling | doaj.art-d314607781d044b68d8122b08bc776192022-12-21T23:40:40ZengElsevierCase Studies in Thermal Engineering2214-157X2022-04-0132101889Linear thermal expansion behavior of compacted bentonite buffer materialsSeok Yoon0Gi-Jun Lee1Gyu-Hyun Go2Division of Radioactive Waste Disposal Research, KAERI, Daejeon, 34057, South KoreaDivision of Radioactive Waste Disposal Research, KAERI, Daejeon, 34057, South KoreaDepartment of Civil Engineering, Kumoh National Institute of Technology, Gumi, 39177, South Korea; Corresponding author.In a geological repository system, buffer is indispensable to ensure the safe disposal of high-level radioactive waste (HLW). Because heat generated from spent nuclear fuel in a canister is released to the surrounding buffers, thermal properties of such materials are fundamental in determining the overall disposal safety. Specifically, given that thermal expansion causes thermal stress to canisters and intact rock masses in the near-field location, it is imperative to evaluate the thermal expansion characteristics of the buffer, particularly when bentonite is used. This study investigates the linear thermal expansion properties of Kyeongju bentonite buffer, a type of Ca-bentonite produced in South Korea. The linear thermal expansion coefficient of dried bentonite was measured considering the heating rate, dry density, and temperature variation using dilatometer equipment. The linear thermal expansion coefficient values of the KJ bentonite buffers were found to be 4.0–6.2 × 10⁻⁶/°C. Based on test results, a numerical analysis was conducted, and the thermal strain values were similar between the test and numerical analysis. The overall linear thermal expansion coefficient of the KJ bentonite, considering radially confined or unconfined conditions and dried or saturated states, was predicted to be between 3.2 × 10⁻6/°C and 1.0 × 10⁻5/°C.http://www.sciencedirect.com/science/article/pii/S2214157X22001356Compacted bentonite buffer materialsLinear thermal expansion coefficientDilatometer testNumerical analysis |
| spellingShingle | Seok Yoon Gi-Jun Lee Gyu-Hyun Go Linear thermal expansion behavior of compacted bentonite buffer materials Case Studies in Thermal Engineering Compacted bentonite buffer materials Linear thermal expansion coefficient Dilatometer test Numerical analysis |
| title | Linear thermal expansion behavior of compacted bentonite buffer materials |
| title_full | Linear thermal expansion behavior of compacted bentonite buffer materials |
| title_fullStr | Linear thermal expansion behavior of compacted bentonite buffer materials |
| title_full_unstemmed | Linear thermal expansion behavior of compacted bentonite buffer materials |
| title_short | Linear thermal expansion behavior of compacted bentonite buffer materials |
| title_sort | linear thermal expansion behavior of compacted bentonite buffer materials |
| topic | Compacted bentonite buffer materials Linear thermal expansion coefficient Dilatometer test Numerical analysis |
| url | http://www.sciencedirect.com/science/article/pii/S2214157X22001356 |
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