Study on Toughening and Temperature Sensitivity of Polyurethane Cement (PUC)
Polyurethane cement (PUC) is now commonly used in the reinforcement of old bridges, which exhibit various issues such as poor toughness, temperature-sensitive mechanical properties, and brittle failure. These problems can lead to the failure of the reinforcement effect of the PUC on old bridges in c...
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-06-01
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| Series: | Materials |
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| Online Access: | https://www.mdpi.com/1996-1944/15/12/4318 |
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| author | Ning Hou Jin Li Xiang Li Yongshu Cui Dalu Xiong Xinzhuang Cui |
| author_facet | Ning Hou Jin Li Xiang Li Yongshu Cui Dalu Xiong Xinzhuang Cui |
| author_sort | Ning Hou |
| collection | DOAJ |
| description | Polyurethane cement (PUC) is now commonly used in the reinforcement of old bridges, which exhibit various issues such as poor toughness, temperature-sensitive mechanical properties, and brittle failure. These problems can lead to the failure of the reinforcement effect of the PUC on old bridges in certain operating environments, leading to the collapse of such reinforced bridges. In order to alleviate these shortcomings, in this study, the toughness of PUC is improved by adding polyvinyl alcohol (PVA) fiber, carbon fiber, and steel fiber. In addition, we study the change law of the flexural strength of PUC between −40 °C and +40 °C. The control parameters evaluated are fiber type, fiber volume ratio, and temperature. A series of flexural tests and scanning electron microscope (SEM) test results show that the flexural strength first increases and then decreases with the increase in the volume-doping ratio of the three fibers. The optimum volume-mixing ratios of polyvinyl alcohol (PVA) fiber, carbon fiber, and steel fiber are 0.3%, 0.04% and 1%, respectively. Excessive addition of fiber will affect the operability and will adversely affect the mechanical properties. The flexural strength of both fiber-reinforced and control samples decreases with increasing temperature. Using the flexural test results, a two-factor (fiber content, temperature) BP neural network flexural strength prediction model is established. It is verified that the model is effective and accurate, and the experimental value and the predicted value are in good agreement. |
| first_indexed | 2024-03-09T23:10:08Z |
| format | Article |
| id | doaj.art-c5d3c90e414540bebcf371d4f99557f5 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-09T23:10:08Z |
| publishDate | 2022-06-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-c5d3c90e414540bebcf371d4f99557f52023-11-23T17:46:26ZengMDPI AGMaterials1996-19442022-06-011512431810.3390/ma15124318Study on Toughening and Temperature Sensitivity of Polyurethane Cement (PUC)Ning Hou0Jin Li1Xiang Li2Yongshu Cui3Dalu Xiong4Xinzhuang Cui5School of Transportation Civil Engineering, Shandong Jiaotong University, Jinan 250357, ChinaSchool of Transportation Civil Engineering, Shandong Jiaotong University, Jinan 250357, ChinaShandong Hi-Speed Construction Management Group Co., Ltd., Jinan 250001, ChinaSchool of Transportation Civil Engineering, Shandong Jiaotong University, Jinan 250357, ChinaJinan Kingyue Highway Engineering Company Limited, Jinan 250220, ChinaSchool of Civil Engineering, Shandong University, Jinan 250061, ChinaPolyurethane cement (PUC) is now commonly used in the reinforcement of old bridges, which exhibit various issues such as poor toughness, temperature-sensitive mechanical properties, and brittle failure. These problems can lead to the failure of the reinforcement effect of the PUC on old bridges in certain operating environments, leading to the collapse of such reinforced bridges. In order to alleviate these shortcomings, in this study, the toughness of PUC is improved by adding polyvinyl alcohol (PVA) fiber, carbon fiber, and steel fiber. In addition, we study the change law of the flexural strength of PUC between −40 °C and +40 °C. The control parameters evaluated are fiber type, fiber volume ratio, and temperature. A series of flexural tests and scanning electron microscope (SEM) test results show that the flexural strength first increases and then decreases with the increase in the volume-doping ratio of the three fibers. The optimum volume-mixing ratios of polyvinyl alcohol (PVA) fiber, carbon fiber, and steel fiber are 0.3%, 0.04% and 1%, respectively. Excessive addition of fiber will affect the operability and will adversely affect the mechanical properties. The flexural strength of both fiber-reinforced and control samples decreases with increasing temperature. Using the flexural test results, a two-factor (fiber content, temperature) BP neural network flexural strength prediction model is established. It is verified that the model is effective and accurate, and the experimental value and the predicted value are in good agreement.https://www.mdpi.com/1996-1944/15/12/4318polyurethane cement (PUC)PVA fibercarbon fibersteel fibertemperature sensitivityBP neural network |
| spellingShingle | Ning Hou Jin Li Xiang Li Yongshu Cui Dalu Xiong Xinzhuang Cui Study on Toughening and Temperature Sensitivity of Polyurethane Cement (PUC) Materials polyurethane cement (PUC) PVA fiber carbon fiber steel fiber temperature sensitivity BP neural network |
| title | Study on Toughening and Temperature Sensitivity of Polyurethane Cement (PUC) |
| title_full | Study on Toughening and Temperature Sensitivity of Polyurethane Cement (PUC) |
| title_fullStr | Study on Toughening and Temperature Sensitivity of Polyurethane Cement (PUC) |
| title_full_unstemmed | Study on Toughening and Temperature Sensitivity of Polyurethane Cement (PUC) |
| title_short | Study on Toughening and Temperature Sensitivity of Polyurethane Cement (PUC) |
| title_sort | study on toughening and temperature sensitivity of polyurethane cement puc |
| topic | polyurethane cement (PUC) PVA fiber carbon fiber steel fiber temperature sensitivity BP neural network |
| url | https://www.mdpi.com/1996-1944/15/12/4318 |
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