Physical properties of portland cement based concrete exposed at a depth of 3520 m in the Nankai Trough
Concrete is widely used in large-scale construction of submarine infrastructure because of its high strength, durability, and ease of handling. However, knowledge of its durability in deep seawater is lacking. In the deep sea, materials are exposed to high pressures and low temperatures, which may c...
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| Format: | Article |
| Language: | English |
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Czech Technical University in Prague
2022-03-01
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| Series: | Acta Polytechnica CTU Proceedings |
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| Online Access: | https://ojs.cvut.cz/ojs/index.php/APP/article/view/8061 |
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| author | Shun Nomura Takafumi Kasaya Yuki Sakoi Hisashi Fukada Akira Matsumoto |
| author_facet | Shun Nomura Takafumi Kasaya Yuki Sakoi Hisashi Fukada Akira Matsumoto |
| author_sort | Shun Nomura |
| collection | DOAJ |
| description | Concrete is widely used in large-scale construction of submarine infrastructure because of its high strength, durability, and ease of handling. However, knowledge of its durability in deep seawater is lacking. In the deep sea, materials are exposed to high pressures and low temperatures, which may cause early deterioration of concrete over time. Concrete materials may also be affected by the chemical composition of seawater, which induces the leaching of calcium. In situ exposure tests are therefore important for understanding degradation processes in the deep sea. In this study, Portland cement based concrete specimens were placed at a depth of 3520 m on the northern edge of the Nankai Trough in 2018 and retrieved in 2019, in the deepest exposure testing conducted to date. Here we provide an outline of the tests, describe the physical properties of materials exposed to deep seawater, freshwater, and air, and discuss possible concrete degradation mechanisms. |
| format | Article |
| id | doaj-art-7bacb901d6fe4aabbca9fbf2cab923e9 |
| institution | Kabale University |
| issn | 2336-5382 |
| language | English |
| publishDate | 2022-03-01 |
| publisher | Czech Technical University in Prague |
| record_format | Article |
| series | Acta Polytechnica CTU Proceedings |
| spelling | doaj-art-7bacb901d6fe4aabbca9fbf2cab923e92025-08-20T03:33:58ZengCzech Technical University in PragueActa Polytechnica CTU Proceedings2336-53822022-03-013341141610.14311/APP.2022.33.04115301Physical properties of portland cement based concrete exposed at a depth of 3520 m in the Nankai TroughShun Nomura0Takafumi Kasaya1Yuki Sakoi2Hisashi Fukada3Akira Matsumoto4Japan Agency for Marin-Earth Science and Technology, Research Institute for Value-Added-Information Generation, Center for Mathematical Science and Advanced Technology, 3173-25 Showa-machi Kanazawa-ku Yokohama-city Kanagawa, 236-0001, JapanJapan Agency for Marin-Earth Science and Technology, Research Institute for Marine Resources Utilization, Submarine Resources Research Center, 2-15 Natsushima-cho Yokosuka-city Kanagawa, 237-0061, JapanHachinohe Institute of Technology, Faculty of Engineering, Department of Civil Engineering and Architecture, 88-1, Obiraki, Myo, Hachinohe, Aomori, 031-8501, JapanFudo Tetra Corporation, Geo-Technical division, 7-2 Nihonbashi Komai-cho Chuou-ku, Tokyo, 103-0016, JapanFudo Tetra Corporation, Technical Research Institute, 2-7 Higashi Nakanuki, Tsuchiura, Ibaraki, 300-0006, JapanConcrete is widely used in large-scale construction of submarine infrastructure because of its high strength, durability, and ease of handling. However, knowledge of its durability in deep seawater is lacking. In the deep sea, materials are exposed to high pressures and low temperatures, which may cause early deterioration of concrete over time. Concrete materials may also be affected by the chemical composition of seawater, which induces the leaching of calcium. In situ exposure tests are therefore important for understanding degradation processes in the deep sea. In this study, Portland cement based concrete specimens were placed at a depth of 3520 m on the northern edge of the Nankai Trough in 2018 and retrieved in 2019, in the deepest exposure testing conducted to date. Here we provide an outline of the tests, describe the physical properties of materials exposed to deep seawater, freshwater, and air, and discuss possible concrete degradation mechanisms.https://ojs.cvut.cz/ojs/index.php/APP/article/view/8061deep seaexposing testphysical property |
| spellingShingle | Shun Nomura Takafumi Kasaya Yuki Sakoi Hisashi Fukada Akira Matsumoto Physical properties of portland cement based concrete exposed at a depth of 3520 m in the Nankai Trough Acta Polytechnica CTU Proceedings deep sea exposing test physical property |
| title | Physical properties of portland cement based concrete exposed at a depth of 3520 m in the Nankai Trough |
| title_full | Physical properties of portland cement based concrete exposed at a depth of 3520 m in the Nankai Trough |
| title_fullStr | Physical properties of portland cement based concrete exposed at a depth of 3520 m in the Nankai Trough |
| title_full_unstemmed | Physical properties of portland cement based concrete exposed at a depth of 3520 m in the Nankai Trough |
| title_short | Physical properties of portland cement based concrete exposed at a depth of 3520 m in the Nankai Trough |
| title_sort | physical properties of portland cement based concrete exposed at a depth of 3520 m in the nankai trough |
| topic | deep sea exposing test physical property |
| url | https://ojs.cvut.cz/ojs/index.php/APP/article/view/8061 |
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