Flexural Behavior of Polyurethane Concrete Reinforced by Carbon Fiber Grid
In view of the problems of traditional repair materials for anchorage concrete of expansion joints, such as ease of damage and long maintenance cycles, the design of polyurethane concrete was optimized in this article, which could be used for rapid repair of concrete in anchorage zone of expansion j...
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| Format: | Article |
| Language: | English |
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MDPI AG
2021-09-01
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| Series: | Materials |
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| Online Access: | https://www.mdpi.com/1996-1944/14/18/5421 |
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| author | Hongjian Ding Quansheng Sun Yanqi Wang Dongzhe Jia Chunwei Li Ce Ji Yuping Feng |
| author_facet | Hongjian Ding Quansheng Sun Yanqi Wang Dongzhe Jia Chunwei Li Ce Ji Yuping Feng |
| author_sort | Hongjian Ding |
| collection | DOAJ |
| description | In view of the problems of traditional repair materials for anchorage concrete of expansion joints, such as ease of damage and long maintenance cycles, the design of polyurethane concrete was optimized in this article, which could be used for rapid repair of concrete in anchorage zone of expansion joints. A new type of carbon fiber grid–polyurethane concrete system was designed, which makes the carbon fiber grid have an excellent synergistic effect with the quick-hardening and high-strength polyurethane concrete, and improved the flexural bearing capacity of the polyurethane concrete. Through the four-point bending test, the influence of the parameters such as the number of grid layers, grid width, and grid density on the flexural bearing capacity of polyurethane concrete beams was tested. The optimum preparation process parameters of carbon fiber grid were obtained to improve the flexural performance of polyurethane concrete. Compared with the Normal specimen, C-80-1’s average flexural strength increased by 47.7%, the failure strain along the beam height increased by 431.1%, and the failure strain at the bottom of the beam increased by 68.9%. The best width of the carbon fiber grid was 80 mm, and the best number of reinforcement layers was one layer. The test results show that the carbon fiber grid could improve the flexural bearing capacity of polyurethane concrete. The carbon fiber grid–polyurethane concrete system provides a new idea for rapid repair of the anchorage zone of bridge expansion joints, and solves the problems such as ease of damage and long maintenance cycles of traditional repair materials, which can be widely used in the future. |
| first_indexed | 2024-03-10T07:29:30Z |
| format | Article |
| id | doaj.art-f4b575480e124a64b263084836c3cc82 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-10T07:29:30Z |
| publishDate | 2021-09-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-f4b575480e124a64b263084836c3cc822023-11-22T14:03:46ZengMDPI AGMaterials1996-19442021-09-011418542110.3390/ma14185421Flexural Behavior of Polyurethane Concrete Reinforced by Carbon Fiber GridHongjian Ding0Quansheng Sun1Yanqi Wang2Dongzhe Jia3Chunwei Li4Ce Ji5Yuping Feng6College of Civil Engineering, Northeast Forestry University, Harbin 150040, ChinaCollege of Civil Engineering, Northeast Forestry University, Harbin 150040, ChinaCollege of Civil Engineering, Northeast Forestry University, Harbin 150040, ChinaCollege of Civil Engineering, Northeast Forestry University, Harbin 150040, ChinaCollege of Civil Engineering, Northeast Forestry University, Harbin 150040, ChinaMaterial Science and Engineering College, Northeast Forestry University, Harbin 150040, ChinaCollege of Civil Engineering, Northeast Forestry University, Harbin 150040, ChinaIn view of the problems of traditional repair materials for anchorage concrete of expansion joints, such as ease of damage and long maintenance cycles, the design of polyurethane concrete was optimized in this article, which could be used for rapid repair of concrete in anchorage zone of expansion joints. A new type of carbon fiber grid–polyurethane concrete system was designed, which makes the carbon fiber grid have an excellent synergistic effect with the quick-hardening and high-strength polyurethane concrete, and improved the flexural bearing capacity of the polyurethane concrete. Through the four-point bending test, the influence of the parameters such as the number of grid layers, grid width, and grid density on the flexural bearing capacity of polyurethane concrete beams was tested. The optimum preparation process parameters of carbon fiber grid were obtained to improve the flexural performance of polyurethane concrete. Compared with the Normal specimen, C-80-1’s average flexural strength increased by 47.7%, the failure strain along the beam height increased by 431.1%, and the failure strain at the bottom of the beam increased by 68.9%. The best width of the carbon fiber grid was 80 mm, and the best number of reinforcement layers was one layer. The test results show that the carbon fiber grid could improve the flexural bearing capacity of polyurethane concrete. The carbon fiber grid–polyurethane concrete system provides a new idea for rapid repair of the anchorage zone of bridge expansion joints, and solves the problems such as ease of damage and long maintenance cycles of traditional repair materials, which can be widely used in the future.https://www.mdpi.com/1996-1944/14/18/5421carbon fiber gridflexural bearing capacityfour-point bending testpolyurethane concrete |
| spellingShingle | Hongjian Ding Quansheng Sun Yanqi Wang Dongzhe Jia Chunwei Li Ce Ji Yuping Feng Flexural Behavior of Polyurethane Concrete Reinforced by Carbon Fiber Grid Materials carbon fiber grid flexural bearing capacity four-point bending test polyurethane concrete |
| title | Flexural Behavior of Polyurethane Concrete Reinforced by Carbon Fiber Grid |
| title_full | Flexural Behavior of Polyurethane Concrete Reinforced by Carbon Fiber Grid |
| title_fullStr | Flexural Behavior of Polyurethane Concrete Reinforced by Carbon Fiber Grid |
| title_full_unstemmed | Flexural Behavior of Polyurethane Concrete Reinforced by Carbon Fiber Grid |
| title_short | Flexural Behavior of Polyurethane Concrete Reinforced by Carbon Fiber Grid |
| title_sort | flexural behavior of polyurethane concrete reinforced by carbon fiber grid |
| topic | carbon fiber grid flexural bearing capacity four-point bending test polyurethane concrete |
| url | https://www.mdpi.com/1996-1944/14/18/5421 |
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