Study on the Bond Performance of Epoxy Resin Concrete with Steel Reinforcement
Epoxy resin concrete, characterized by its superior mechanical properties, is frequently utilized for structural reinforcement and strengthening. However, its application in structural members remains limited. In this paper, the bond–slip behavior between steel reinforcement and epoxy resin concrete...
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MDPI AG
2024-09-01
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| author | Peiqi Chen Yueqiang Li Xiaojie Zhou Hao Wang Jie Li |
| author_facet | Peiqi Chen Yueqiang Li Xiaojie Zhou Hao Wang Jie Li |
| author_sort | Peiqi Chen |
| collection | DOAJ |
| description | Epoxy resin concrete, characterized by its superior mechanical properties, is frequently utilized for structural reinforcement and strengthening. However, its application in structural members remains limited. In this paper, the bond–slip behavior between steel reinforcement and epoxy resin concrete was investigated using a combination of experimental research and finite element analysis, with the objective of providing data support for substantiating the expanded use of epoxy resin concrete in structural members. The research methodology included 18 center-pullout tests and 14 finite element model calculations, focusing on the effects of variables such as epoxy resin concrete strength, steel reinforcement strength, steel reinforcement diameter and protective layer thickness on bond performance. The results reveal that the bond strength between epoxy resin concrete and steel reinforcement significantly surpasses that of ordinary concrete, being approximately 3.23 times higher given the equivalent strength level of the material; the improvement in the strength of both the epoxy resin concrete and steel reinforcement are observed to marginally increase the bond stress. Conversely, an increase in the diameter of the steel reinforcement and a reduction in the thickness of the protective layer of the concrete can lead to diminished bond stress and peak slip. Particularly, when the steel reinforcement strength is below 500 MPa, it tends to reach its yield strength and may even detach during the drawing process, indicating that the yielding of the steel reinforcement occurs before the loss of bond stress. In contrast, for a steel reinforcement strength exceeding 500 MPa, yielding does not precede bond stress loss, resulting in a distinct form of failure described as scraping plough type destruction. Compared to ordinary concrete, the peak of the epoxy resin concrete and steel reinforcement bond stress–slip curve is more pointed, indicating a rapid degradation to maximum bond stress and exhibiting a brittle nature. Overall, these peaks are sharper than those of ordinary concrete, indicating a rapid decline in bond stress post-peak, reflective of its brittle characteristics. |
| format | Article |
| id | doaj-art-8249a6e49e6949da89eba145f904f8a8 |
| institution | OA Journals |
| issn | 2075-5309 |
| language | English |
| publishDate | 2024-09-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Buildings |
| spelling | doaj-art-8249a6e49e6949da89eba145f904f8a82025-08-20T01:56:01ZengMDPI AGBuildings2075-53092024-09-01149290510.3390/buildings14092905Study on the Bond Performance of Epoxy Resin Concrete with Steel ReinforcementPeiqi Chen0Yueqiang Li1Xiaojie Zhou2Hao Wang3Jie Li4Tianjin Key Laboratory of Civil Buildings Protection and Reinforcement, Tianjin 300384, ChinaTianjin Key Laboratory of Civil Buildings Protection and Reinforcement, Tianjin 300384, ChinaTianjin Key Laboratory of Civil Buildings Protection and Reinforcement, Tianjin 300384, ChinaTianjin Key Laboratory of Civil Buildings Protection and Reinforcement, Tianjin 300384, ChinaTianjin Key Laboratory of Civil Buildings Protection and Reinforcement, Tianjin 300384, ChinaEpoxy resin concrete, characterized by its superior mechanical properties, is frequently utilized for structural reinforcement and strengthening. However, its application in structural members remains limited. In this paper, the bond–slip behavior between steel reinforcement and epoxy resin concrete was investigated using a combination of experimental research and finite element analysis, with the objective of providing data support for substantiating the expanded use of epoxy resin concrete in structural members. The research methodology included 18 center-pullout tests and 14 finite element model calculations, focusing on the effects of variables such as epoxy resin concrete strength, steel reinforcement strength, steel reinforcement diameter and protective layer thickness on bond performance. The results reveal that the bond strength between epoxy resin concrete and steel reinforcement significantly surpasses that of ordinary concrete, being approximately 3.23 times higher given the equivalent strength level of the material; the improvement in the strength of both the epoxy resin concrete and steel reinforcement are observed to marginally increase the bond stress. Conversely, an increase in the diameter of the steel reinforcement and a reduction in the thickness of the protective layer of the concrete can lead to diminished bond stress and peak slip. Particularly, when the steel reinforcement strength is below 500 MPa, it tends to reach its yield strength and may even detach during the drawing process, indicating that the yielding of the steel reinforcement occurs before the loss of bond stress. In contrast, for a steel reinforcement strength exceeding 500 MPa, yielding does not precede bond stress loss, resulting in a distinct form of failure described as scraping plough type destruction. Compared to ordinary concrete, the peak of the epoxy resin concrete and steel reinforcement bond stress–slip curve is more pointed, indicating a rapid degradation to maximum bond stress and exhibiting a brittle nature. Overall, these peaks are sharper than those of ordinary concrete, indicating a rapid decline in bond stress post-peak, reflective of its brittle characteristics.https://www.mdpi.com/2075-5309/14/9/2905epoxy resin concretebond performancebond stress–slip curveexperimentfinite element (method) |
| spellingShingle | Peiqi Chen Yueqiang Li Xiaojie Zhou Hao Wang Jie Li Study on the Bond Performance of Epoxy Resin Concrete with Steel Reinforcement Buildings epoxy resin concrete bond performance bond stress–slip curve experiment finite element (method) |
| title | Study on the Bond Performance of Epoxy Resin Concrete with Steel Reinforcement |
| title_full | Study on the Bond Performance of Epoxy Resin Concrete with Steel Reinforcement |
| title_fullStr | Study on the Bond Performance of Epoxy Resin Concrete with Steel Reinforcement |
| title_full_unstemmed | Study on the Bond Performance of Epoxy Resin Concrete with Steel Reinforcement |
| title_short | Study on the Bond Performance of Epoxy Resin Concrete with Steel Reinforcement |
| title_sort | study on the bond performance of epoxy resin concrete with steel reinforcement |
| topic | epoxy resin concrete bond performance bond stress–slip curve experiment finite element (method) |
| url | https://www.mdpi.com/2075-5309/14/9/2905 |
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