Durability evaluation of surface softened steel bar for prestressed concrete
The effects of Si addition and surface softening on delayed fracture susceptibility were evaluated in tempered martensitic steels with tensile strength of 1450 MPa. The delayed fracture susceptibility was reduced when Si content was increased from 0.2 mass% to 1.88 mass%. The delayed fracture suscep...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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CTU Central Library
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/8013 |
| _version_ | 1828380267963744256 |
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| author | Kengo Iwanaga Shigeru Mizoguchi Yu Matsumoto Kenichi Takai Mikiyuki Ichiba |
| author_facet | Kengo Iwanaga Shigeru Mizoguchi Yu Matsumoto Kenichi Takai Mikiyuki Ichiba |
| author_sort | Kengo Iwanaga |
| collection | DOAJ |
| description | The effects of Si addition and surface softening on delayed fracture susceptibility were evaluated in tempered martensitic steels with tensile strength of 1450 MPa. The delayed fracture susceptibility was reduced when Si content was increased from 0.2 mass% to 1.88 mass%. The delayed fracture susceptibility of steel containing 1.88 mass% Si was reduced further when the tensile strength of its surface was lowered to around 1150MPa. Based on above results, the durability of these steel bars was evaluated by exposure test of prestressed concrete poles (CP). The bending load of the PC pole was 1.3 times of the design load. As a result of dismantling investigation after 10 years exposure test, there were no breakage of the steel bars in the PC poles and the soundness was maintained. In this paper, we will also introduce some comparison results of exposure tests and acceleration tests with aiming to establish the evaluation methods for the long-term durability. |
| first_indexed | 2024-12-10T03:54:45Z |
| format | Article |
| id | doaj.art-a39f4a2012094374bacaabac60a22556 |
| institution | Directory Open Access Journal |
| issn | 2336-5382 |
| language | English |
| last_indexed | 2024-12-10T03:54:45Z |
| publishDate | 2022-03-01 |
| publisher | CTU Central Library |
| record_format | Article |
| series | Acta Polytechnica CTU Proceedings |
| spelling | doaj.art-a39f4a2012094374bacaabac60a225562022-12-22T02:03:10ZengCTU Central LibraryActa Polytechnica CTU Proceedings2336-53822022-03-013326327010.14311/APP.2022.33.02635253Durability evaluation of surface softened steel bar for prestressed concreteKengo Iwanaga0Shigeru Mizoguchi1Yu Matsumoto2Kenichi Takai3Mikiyuki Ichiba4Neturen Czech s.r.o., Jizni 1079 Bitozeves Prumyslova zona Triangle 438 01 Bitozeves Czech RepublicNeturen Co., Ltd., 2-17-1 Higashi-Gotanda, Shinagawa-ku, Tokyo 141-8639, JapanSophia University, 7-1 Kioi-cho, Chiyoda-ku, Tokyo 102-8554, JapanDepartment of Engineering and Applied Science, Faculty of Science and Technology, Sophia University, 7-1 Kioi-cho, Chiyoda-ku, Tokyo 102-8554, JapanR&D dept., Tokyo Electric Power Company Holding, Inc., 4-1 Egasaki-cho, Tsurumi-ku, Yokohama 230-8510, JapanThe effects of Si addition and surface softening on delayed fracture susceptibility were evaluated in tempered martensitic steels with tensile strength of 1450 MPa. The delayed fracture susceptibility was reduced when Si content was increased from 0.2 mass% to 1.88 mass%. The delayed fracture susceptibility of steel containing 1.88 mass% Si was reduced further when the tensile strength of its surface was lowered to around 1150MPa. Based on above results, the durability of these steel bars was evaluated by exposure test of prestressed concrete poles (CP). The bending load of the PC pole was 1.3 times of the design load. As a result of dismantling investigation after 10 years exposure test, there were no breakage of the steel bars in the PC poles and the soundness was maintained. In this paper, we will also introduce some comparison results of exposure tests and acceleration tests with aiming to establish the evaluation methods for the long-term durability.https://ojs.cvut.cz/ojs/index.php/APP/article/view/8013delayed fracturedurabilityprestressed concrete polesurface softened steel bar |
| spellingShingle | Kengo Iwanaga Shigeru Mizoguchi Yu Matsumoto Kenichi Takai Mikiyuki Ichiba Durability evaluation of surface softened steel bar for prestressed concrete Acta Polytechnica CTU Proceedings delayed fracture durability prestressed concrete pole surface softened steel bar |
| title | Durability evaluation of surface softened steel bar for prestressed concrete |
| title_full | Durability evaluation of surface softened steel bar for prestressed concrete |
| title_fullStr | Durability evaluation of surface softened steel bar for prestressed concrete |
| title_full_unstemmed | Durability evaluation of surface softened steel bar for prestressed concrete |
| title_short | Durability evaluation of surface softened steel bar for prestressed concrete |
| title_sort | durability evaluation of surface softened steel bar for prestressed concrete |
| topic | delayed fracture durability prestressed concrete pole surface softened steel bar |
| url | https://ojs.cvut.cz/ojs/index.php/APP/article/view/8013 |
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