Effects of specimen size and loading rate on the mechanical property of Bentonil-WRK bentonite for engineered barrier system
This study aims to investigate the effects of specimen size and loading rate on the mechanical property of Bentonil-WRK bentonite buffer material for engineered barrier system. Highly instrumented unconfined compressive strength tests were performed on cylindrical specimens prepared using cold isost...
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| Format: | Article |
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Elsevier
2025-02-01
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| Series: | Nuclear Engineering and Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S1738573324004200 |
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| author | Ivan Jeff Navea Jebie Balagosa Se Hee Han Seok Yoon Yun Wook Choo |
| author_facet | Ivan Jeff Navea Jebie Balagosa Se Hee Han Seok Yoon Yun Wook Choo |
| author_sort | Ivan Jeff Navea |
| collection | DOAJ |
| description | This study aims to investigate the effects of specimen size and loading rate on the mechanical property of Bentonil-WRK bentonite buffer material for engineered barrier system. Highly instrumented unconfined compressive strength tests were performed on cylindrical specimens prepared using cold isostatic pressing (CIP) technique at varying testing conditions: (a) CIP pressures of 29.43 MPa, 39.24 MPa, and 58.86 MPa, (b) specimen sizes of 30 × 60mm, 40 × 80mm, and 50 × 100mm, and (c) loading rates of 0.5 %/min, 1.0 %/min, and 1.5 %/min. As CIP pressure increases, the unconfined compressive strength (qu), failure strain (εf), and elastic modulus (E) of Bentonil-WRK increase similar to Gyeongju compacted bentonite (KJ-II). Increase in diameter results in a decrease in qu and εf, and increase in E. Minimal effect of loading rate was observed on qu and εf. However, increasing loading rate tends to increase E. In addition, decrease in diameter increases the elastic threshold axial strain (εe,th). Increase in diameter and loading rate slightly increases Poisson's ratio. Prediction models are provided for assessing the effects of specimen diameter on qu and εf. Furthermore, correlation models of qu to ρd and E are proposed for Bentonil-WRK bentonite buffer material. |
| format | Article |
| id | doaj-art-7175e81221ed4d9aab697633c3c5ccf8 |
| institution | Kabale University |
| issn | 1738-5733 |
| language | English |
| publishDate | 2025-02-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Nuclear Engineering and Technology |
| spelling | doaj-art-7175e81221ed4d9aab697633c3c5ccf82025-01-31T05:10:59ZengElsevierNuclear Engineering and Technology1738-57332025-02-01572103172Effects of specimen size and loading rate on the mechanical property of Bentonil-WRK bentonite for engineered barrier systemIvan Jeff Navea0Jebie Balagosa1Se Hee Han2Seok Yoon3Yun Wook Choo4Department of Civil and Environmental Engineering, Kongju National University, 31080, 1223-24, Cheonan-daero, Seobuk-gu, Cheonan-si, Chungcheongnam-do, (275 Budae-dong), Republic of KoreaDepartment of Civil and Environmental Engineering, Kongju National University, 31080, 1223-24, Cheonan-daero, Seobuk-gu, Cheonan-si, Chungcheongnam-do, (275 Budae-dong), Republic of KoreaDepartment of Civil and Environmental Engineering, Kongju National University, 31080, 1223-24, Cheonan-daero, Seobuk-gu, Cheonan-si, Chungcheongnam-do, (275 Budae-dong), Republic of KoreaDisposal Safety Evaluation Research Division, Korea Atomic Energy Research Institute (KAERI), 111 Daedeok-daero 989 Beon-gil, Yuseong-gu, Daejeon, 34057, Republic of KoreaDepartment of Civil and Environmental Engineering, Kongju National University, 31080, 1223-24, Cheonan-daero, Seobuk-gu, Cheonan-si, Chungcheongnam-do, (275 Budae-dong), Republic of Korea; Corresponding author.This study aims to investigate the effects of specimen size and loading rate on the mechanical property of Bentonil-WRK bentonite buffer material for engineered barrier system. Highly instrumented unconfined compressive strength tests were performed on cylindrical specimens prepared using cold isostatic pressing (CIP) technique at varying testing conditions: (a) CIP pressures of 29.43 MPa, 39.24 MPa, and 58.86 MPa, (b) specimen sizes of 30 × 60mm, 40 × 80mm, and 50 × 100mm, and (c) loading rates of 0.5 %/min, 1.0 %/min, and 1.5 %/min. As CIP pressure increases, the unconfined compressive strength (qu), failure strain (εf), and elastic modulus (E) of Bentonil-WRK increase similar to Gyeongju compacted bentonite (KJ-II). Increase in diameter results in a decrease in qu and εf, and increase in E. Minimal effect of loading rate was observed on qu and εf. However, increasing loading rate tends to increase E. In addition, decrease in diameter increases the elastic threshold axial strain (εe,th). Increase in diameter and loading rate slightly increases Poisson's ratio. Prediction models are provided for assessing the effects of specimen diameter on qu and εf. Furthermore, correlation models of qu to ρd and E are proposed for Bentonil-WRK bentonite buffer material.http://www.sciencedirect.com/science/article/pii/S1738573324004200Bentonil-WRK bentoniteUnconfined compressive strengthElastic modulusPoisson's ratioSpecimen size effectLoading rate effect |
| spellingShingle | Ivan Jeff Navea Jebie Balagosa Se Hee Han Seok Yoon Yun Wook Choo Effects of specimen size and loading rate on the mechanical property of Bentonil-WRK bentonite for engineered barrier system Nuclear Engineering and Technology Bentonil-WRK bentonite Unconfined compressive strength Elastic modulus Poisson's ratio Specimen size effect Loading rate effect |
| title | Effects of specimen size and loading rate on the mechanical property of Bentonil-WRK bentonite for engineered barrier system |
| title_full | Effects of specimen size and loading rate on the mechanical property of Bentonil-WRK bentonite for engineered barrier system |
| title_fullStr | Effects of specimen size and loading rate on the mechanical property of Bentonil-WRK bentonite for engineered barrier system |
| title_full_unstemmed | Effects of specimen size and loading rate on the mechanical property of Bentonil-WRK bentonite for engineered barrier system |
| title_short | Effects of specimen size and loading rate on the mechanical property of Bentonil-WRK bentonite for engineered barrier system |
| title_sort | effects of specimen size and loading rate on the mechanical property of bentonil wrk bentonite for engineered barrier system |
| topic | Bentonil-WRK bentonite Unconfined compressive strength Elastic modulus Poisson's ratio Specimen size effect Loading rate effect |
| url | http://www.sciencedirect.com/science/article/pii/S1738573324004200 |
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