纤维再生混凝土的研究进展与展望

许金校; 肖建庄; 罗素蓉; 张青天

doi:10.13204/j.gyjzG20112711

纤维再生混凝土的研究进展与展望

doi: 10.13204/j.gyjzG20112711

1. 福州大学土木工程学院, 福州 350116;
2. 同济大学土木工程学院, 上海 200092

基金项目:

国家自然科学基金面上项目(52078358,52078139) 。

详细信息

作者简介:
许金校,男,1996年出生,硕士研究生。

通讯作者:
肖建庄,男,1968年出生,博士,教授,博士研究生导师,jzx@tongji.edu.cn。

计量
- 文章访问数: 218
- HTML全文浏览量: 46
- PDF下载量: 8
- 被引次数: 0
出版历程
- 收稿日期: 2020-11-27
- 网络出版日期: 2022-06-30
- 刊出日期: 2022-02-20

Research Progress and Prospect of Fiber-Recycled Concrete

1. College of Civil Engineering, Fuzhou University, Fuzhou 350116, China;
2. Department of Structural Engineering, Tongji University, Shanghai 200092, China

摘要

摘要: 纤维与再生混凝土的组合使用改善了再生混凝土的自身缺陷,强化了其力学与耐久性能,通过文献分析,从纤维类型、改性效果等方面介绍纤维再生混凝土的研究现状。常见的钢纤维在2%体积掺量掺量下,可分别将再生混凝土的抗压、劈拉及抗折强度较未掺加纤维时40.1%、124.6%和286.1%,同时提高再生混凝土的密实性,提升疲劳寿命;聚丙烯纤维可有效控制裂缝开展,提高抗断裂性能,1.2%的体积掺量下,可将断裂韧度、断裂能较未掺加纤维时分别提升71.13%、330.77%,且在高温中可熔化,减轻爆裂现象。玄武岩纤维在优化力学性能的同时,对再生混凝土抗氯离子渗透性能存在良好的改善作用,3%体积掺量的玄武岩纤维的提升效果最为显著。此外,再生纤维可由废弃地毯、废旧轮胎等通过人工裁剪或热解及低温还原等工艺加工而成,其性能可达一般纤维性能指标,0.12%体积掺量的再生聚丙烯纤维可使再生混凝土抗拉强度较未掺加纤维时提升12.34%。最后,对各纤维合适的改性性能进行了讨论,对再生纤维以及各纤维的混杂应用进行了展望,为纤维再生混凝土的进一步研究和应用提供基础。
- 再生混凝土 /
- 纤维再生混凝土 /
- 力学性能 /
- 耐久性能
Abstract: The combined use of fibers and recycled concrete improves the defects of recycled concrete and strengthens its mechanical and durability properties. The paper introduced the research status of fibers-recycled concrete from the aspects of fiber types and modification effects through literature review. Comparison with common recycled concrete, the common steel fiber could increase the compressive, splitting and flexural strength of recycled concrete by 40.1%, 124.6% and 286.1% respectively with the volume content of could 2%, while improving the compactness of recycled concrete and its fatigue life. Similarly, the polypropylene fiber could effectively control the fracture development and improve the fracture performance of recycled concrete. With the 1.2% volume content of it, the fracture toughness and fracture energy could be increased by 71.13% and 330.77% respectively. In addition, the spalling of recycled concrete under high temperatures could be reduced by the fusion of polypropylene fibers. And also, the basalt fiber had a good effect on improving the chloride ion permeability of recycled concrete while optimizing its mechanical properties, the 3% volume content of it had the most significant improvement effect. Moreover, the recycled fiber could be made from discarded carpets and tires through manual cutting, pyrolysis, low-temperature reduction and other processes, and its performance could reach the level of general fibers. The compressive strength of the recycled concrete with the 0.12% volume content of recycled polypropylene steel fibers could be increased by 12.34% comparison with common recycled concrete. Furthermore, based on the discussion of appropriate modification properties for each fiber, the prospects of the recycled fiber and the hybrid application of fibers were presented, which would benefited further research and application of the fiber-recycled concrete.
- recycled concrete /
- fiber-recycled concrete /
- mechanical properties /
- durability

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