混杂聚丙烯纤维-回收轮胎钢纤维增强UHPC高温后力学性能
作者:
作者单位:

1.东北大学 资源与土木工程学院,辽宁 沈阳 110819;2.东北大学 低碳钢铁前沿技术研究院,辽宁 沈阳 110819

作者简介:

陈 猛(1981—), 男, 辽宁开原人,东北大学副教授, 博士生导师, 博士. E-mail:chenmeng@mail.neu.edu.cn

通讯作者:

张 通(1995—), 男, 黑龙江哈尔滨人, 东北大学讲师, 博士. E-mail: zhangtong@mail.neu.edu.cn

中图分类号:

TU528.572

基金项目:

国家自然科学基金资助项目(52178382); 中央高校基本科研业务专项资金资助项目(N2201023);辽宁省自然科学基金资助项目(2020-MS-089)


Mechanical Properties of Hybrid Polypropylene Fiber-Recycled Tyre Steel Fiber Reinforced UHPC after Exposure to Elevated Temperatures
Author:
Affiliation:

1.School of Resources and Civil Engineering, Northeastern University, Shenyang 110819, China;2.Institute for Frontier Technologies of Low-Carbon Steelmaking, Northeastern University, Shenyang 110819, China

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    摘要:

    测试了混杂聚丙烯纤维(PPF)-回收轮胎钢纤维(RTSF)增强超高性能混凝土(UHPC)高温后的抗压强度,并研究了其工作性能.结果表明:PPF体积分数达到0.9%后,可以防止UHPC发生高温爆裂;UHPC的抗压强度随着温度的升高先增大后减小,400 ℃作用后达到最大值,比20 ℃作用后提高了9.2%~19.9%;相同温度作用后,UHPC的抗压强度随着PPF体积分数的增大而降低;PPF熔化前与基体有效黏结,其与RTSF均可发挥桥连作用,PPF熔化后在基体中形成孔道,提高了UHPC的耐高温性能.

    Abstract:

    The workability and compressive strength of hybrid polypropylene fiber (PPF)-recycled tyre steel fiber (RTSF) ultra-high performance concrete (UHPC) were tested after exposure to elevated temperatures. The results show that the 0.9% volume fraction of PPF can prevent from spalling of UHPC during heating process. The compressive strength increases and then decreases with the increasing temperature, reaching its maximum value after being treated at 400 ℃, which is 9.2%-19.9% higher than that after being treated at 20 ℃. After the same temperature effect, the compressive strength of UHPC decreases with the increases of PPF volume fraction. PPF effectively adheres to the matrix before fiber melting, and can play a bridging role with RTSF. After fiber melting, PPF forms channels in the matrix, improving the high temperature resistance of UHPC.

    图1 RTSF的长度分布图Fig.1 Length distribution diagram of RTSF
    图2 PPF体积分数对UHPC流动度的影响Fig.2 Effect of φPPF on flowability of UHPC
    图3 UHPC的质量损失率Fig.3 Weight loss rate of UHPC
    图4 温度对UHPC抗压强度的影响Fig.4 Effect of temperature on compressive strength of UHPC
    图5 不同阶段混杂PPF-RTSF增强UHPC微观结构示意图Fig.5 Schematic demonstration of microstructure of hybrid PPF-RTSF reinforced UHPC at different stages
    图6 不同温度作用后纤维与UHPC基体界面的SEM照片Fig.6 SEM images of interface between fiber and UHPC substrate after exposure to different temperatures
    表 2 UHPC的配合比Table 2 Mix proportions of UHPC
    表 1 PPF和RTSF的性能Table 1 Properties of PPF and RTSF
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引用本文

陈猛,李骜,张通.混杂聚丙烯纤维-回收轮胎钢纤维增强UHPC高温后力学性能[J].建筑材料学报,2023,26(7):716-722

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  • 收稿日期:2022-09-25
  • 最后修改日期:2022-11-21
  • 在线发布日期: 2023-09-15
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