| 桥梁伸缩缝超高性能混凝土关键性能的研究与应用 |
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| 引用本文： | 任亮,梁明元,王凯,何瑜,赵国刚.桥梁伸缩缝超高性能混凝土关键性能的研究与应用[J].硅酸盐通报,2018,37(6):2048-2052. |
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| 作者姓名： | 任亮 梁明元 王凯 何瑜 赵国刚 |
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| 作者单位： | 华东交通大学土建学院,南昌,330013;江西省高速公路投资集团有限公司,南昌,330025 |
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| 基金项目： | 江西省青年科学家培养对象计划(20142BCB23012)%江西省交通运输厅科技项目(2016C0008) |
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| 摘 要： | 基于不同纤维混杂效应设计原理,利用PVA纤维或聚丙烯纤维与钢纤维二元混杂优化,制备了一种常温养护桥梁伸缩缝超高性能混凝土(UHPC),并探讨了其在实际工程中的应用.研究结果表明,采用这种方法所制备的混杂纤维增强UHPC不仅具有较高的强度且抗裂性好.当用掺量为20 kg/m的聚丙烯纤维与钢纤维混杂时,UHPC常温养护2 d时的抗折强度和抗压强度可分别达到13.6 MPa和40.9 MPa,28 d时可分别达到51.3 MPa和138.5 MPa,且无明显的收缩开裂现象.工程实践表明,利用该混杂纤维增强UHPC对桥梁伸缩缝混凝土的病害进行整治时,不仅可以达到技术性能使用要求,而且可实现快速恢复交通,具有广阔的推广应用前景.
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| 关 键 词： | 桥梁伸缩缝 超高性能混凝土 混杂纤维 常温养护 工程应用 |
Key Performance and Application of Ultra High Performance Concrete in Bridge Expansion Joint |
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| REN Liang,LIANG Ming-yuan,WANG Kai,HE Yu,ZHAO Guo-gang.Key Performance and Application of Ultra High Performance Concrete in Bridge Expansion Joint[J].Bulletin of the Chinese Ceramic Society,2018,37(6):2048-2052. |
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| Authors: | REN Liang LIANG Ming-yuan WANG Kai HE Yu ZHAO Guo-gang |
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| Abstract: | Based on the theory of hybrid fibers, an improved ultra high performance concrete ( UHPC) is proposed after the optimization of different hybrid fibers, including PVA fiber or polypropylene ( PP) fiber and steel fiber, which realizes the curing under the normal temperature.The application of the proposed UHPC used in the repair of the transition of the bridge expansion joint is discussed.The research results show that the hybrid fiber reinforced UHPC has high strength and good crack resistance when the addition of the PP fiber is 20 kg/m3.The flexural strength and compressive strength of UHPC samples can amount to 13.6 MPa and 40.9 MPa when the curing time is 2 d, respectively, and 51.3 MPa and 138.5 MPa when the curing time is 28 d, respectively.The phenomenon of the shrinkage crack isn't clear during the shrinkage slab test.Engineering practice indicates that the proposed UHPC used in the repair of bridge expansion joint can not only satisfy the service performance, but also quickly restore the traffic, which has broad application prospects |
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| Keywords: | bridge expansion joint ultra high performance concrete hybrid fiber curing under normal temperature engineering application |
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