Bonded Behavior of Hybrid-Bonded CFRP to Heat-Damaged Concrete Interface
The reliable bond of CFRP to heat-damaged concrete is fundamental to ensuring cooperative working when the CFRP is applied for strengthening fire-damaged concrete structures. In this paper, the bond performance of hybrid-bonded (HB) CFRP to a heat-damaged concrete surface was investigated by using s...
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| Format: | Article |
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MDPI AG
2023-10-01
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| Series: | Buildings |
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| Online Access: | https://www.mdpi.com/2075-5309/13/11/2736 |
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| author | Guirong Liu Yao Wang Fulai Qu Xu Guo Yang Li Shengzhao Cheng |
| author_facet | Guirong Liu Yao Wang Fulai Qu Xu Guo Yang Li Shengzhao Cheng |
| author_sort | Guirong Liu |
| collection | DOAJ |
| description | The reliable bond of CFRP to heat-damaged concrete is fundamental to ensuring cooperative working when the CFRP is applied for strengthening fire-damaged concrete structures. In this paper, the bond performance of hybrid-bonded (HB) CFRP to a heat-damaged concrete surface was investigated by using single shear tests. The concrete blocks were initially heat-damaged to temperatures of 100 °C, 200 °C, 300 °C, and 400 °C. The heat-damaged blocks were subsequently bonded with CFRP using the HB technique. The primary experiment parameters were the exposure temperature, the number of mechanical fasteners, and the bonded layers of CFRP. The test results show that the external-bonded (EB) and HB-CFRP joints with concrete exposed to a temperature of 400 °C were prone to fail with concrete shear-tension due to the decreased shear strength of concrete at high temperatures. The EB- and HB-CFRP joints with heat-damaged concrete anchored with no more than three fasteners present a higher bond than the reference joints with unheated concrete, while the HB-CFRP joints anchored with three fasteners provide a decreased bond capacity with the increase in exposure temperature. The utilization rate of single-layer CFRP joints with unheated concrete increased by 57.9%, 139.5%, and 136.8% with the mechanical fasteners in numbers of one, two, and three compared with the reference specimen. Accordingly, the bond capacity increased by 111.8%, 128.4%, and 186.7%. Finally, a model was proposed to estimate the bond strength of HB-CFRP joints with heat-damaged concrete. |
| first_indexed | 2024-03-09T16:57:25Z |
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| id | doaj.art-2e2391cde455420684481ea960ca05ff |
| institution | Directory Open Access Journal |
| issn | 2075-5309 |
| language | English |
| last_indexed | 2024-03-09T16:57:25Z |
| publishDate | 2023-10-01 |
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| series | Buildings |
| spelling | doaj.art-2e2391cde455420684481ea960ca05ff2023-11-24T14:33:10ZengMDPI AGBuildings2075-53092023-10-011311273610.3390/buildings13112736Bonded Behavior of Hybrid-Bonded CFRP to Heat-Damaged Concrete InterfaceGuirong Liu0Yao Wang1Fulai Qu2Xu Guo3Yang Li4Shengzhao Cheng5International Joint Research Lab for Eco-Building Materials and Engineering of Henan, North China University of Water Resources and Electric Power, Zhengzhou 450045, ChinaChina Construction Seventh Engineering Bureau Co., Ltd., Zhengzhou 450004, ChinaInternational Joint Research Lab for Eco-Building Materials and Engineering of Henan, North China University of Water Resources and Electric Power, Zhengzhou 450045, ChinaInternational Joint Research Lab for Eco-Building Materials and Engineering of Henan, North China University of Water Resources and Electric Power, Zhengzhou 450045, ChinaInternational Joint Research Lab for Eco-Building Materials and Engineering of Henan, North China University of Water Resources and Electric Power, Zhengzhou 450045, ChinaChina Construction Seventh Engineering Bureau Co., Ltd., Zhengzhou 450004, ChinaThe reliable bond of CFRP to heat-damaged concrete is fundamental to ensuring cooperative working when the CFRP is applied for strengthening fire-damaged concrete structures. In this paper, the bond performance of hybrid-bonded (HB) CFRP to a heat-damaged concrete surface was investigated by using single shear tests. The concrete blocks were initially heat-damaged to temperatures of 100 °C, 200 °C, 300 °C, and 400 °C. The heat-damaged blocks were subsequently bonded with CFRP using the HB technique. The primary experiment parameters were the exposure temperature, the number of mechanical fasteners, and the bonded layers of CFRP. The test results show that the external-bonded (EB) and HB-CFRP joints with concrete exposed to a temperature of 400 °C were prone to fail with concrete shear-tension due to the decreased shear strength of concrete at high temperatures. The EB- and HB-CFRP joints with heat-damaged concrete anchored with no more than three fasteners present a higher bond than the reference joints with unheated concrete, while the HB-CFRP joints anchored with three fasteners provide a decreased bond capacity with the increase in exposure temperature. The utilization rate of single-layer CFRP joints with unheated concrete increased by 57.9%, 139.5%, and 136.8% with the mechanical fasteners in numbers of one, two, and three compared with the reference specimen. Accordingly, the bond capacity increased by 111.8%, 128.4%, and 186.7%. Finally, a model was proposed to estimate the bond strength of HB-CFRP joints with heat-damaged concrete.https://www.mdpi.com/2075-5309/13/11/2736heat-damaged concretebondhybrid-bonded FRPsingle shear testbond strength model |
| spellingShingle | Guirong Liu Yao Wang Fulai Qu Xu Guo Yang Li Shengzhao Cheng Bonded Behavior of Hybrid-Bonded CFRP to Heat-Damaged Concrete Interface Buildings heat-damaged concrete bond hybrid-bonded FRP single shear test bond strength model |
| title | Bonded Behavior of Hybrid-Bonded CFRP to Heat-Damaged Concrete Interface |
| title_full | Bonded Behavior of Hybrid-Bonded CFRP to Heat-Damaged Concrete Interface |
| title_fullStr | Bonded Behavior of Hybrid-Bonded CFRP to Heat-Damaged Concrete Interface |
| title_full_unstemmed | Bonded Behavior of Hybrid-Bonded CFRP to Heat-Damaged Concrete Interface |
| title_short | Bonded Behavior of Hybrid-Bonded CFRP to Heat-Damaged Concrete Interface |
| title_sort | bonded behavior of hybrid bonded cfrp to heat damaged concrete interface |
| topic | heat-damaged concrete bond hybrid-bonded FRP single shear test bond strength model |
| url | https://www.mdpi.com/2075-5309/13/11/2736 |
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