高温对玄武岩纤维筋混杂纤维再生混凝土粘结性能的影响
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TUB528.34

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东南大学混凝土及预应力混凝土结构教育部重点实验室开放课题(CPCSME2017-03)


Effect of high temperature on Bond Behavior between BFRP Bars and Hybrid Fiber Recycled Aggregate Concrete
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    摘要:

    通过中心拉拔试验研究玄武岩纤维筋(BFRP筋)与混杂纤维再生混凝土高温后粘结性能。选取体积掺量均为0.15%的玄武岩和纤维素纤维混掺再生混凝土中,目标温度为20°C、200°C、400°C、600°C和800°C。试验研究结果表明:相同温度条件下,混杂纤维的掺入有效提高了粘结强度;再生混凝土与BFRP筋的粘结弹性模量随着温度升高而逐渐降低;峰值粘结强度随温度升高出现先上升后降低的趋势;未掺入混杂纤维的随温度升高峰值粘结强度逐渐降低。建立了粘结-滑移曲线且与试验结果吻合较好,可为BFRP筋与混杂纤维再生混凝土粘结性能研究提供一定的参考。

    Abstract:

    The bonding performance of basalt fiber reinforced polymer (BFRP) bars and hybrid fiber recycled-aggregate concrete at high temperatures is studied by a central pull-out test. The recycled-aggregate concrete is mixed with a volume fraction of 0.15% basalt and cellulose fibers. The target temperature is selected as 20℃、200 ℃、400 ℃、600 ℃ and 800 ℃. The experimental results show that: The bonding strength is effectively improved by the addition of hybrid fibers at the same temperature. The bond elastic modulus of recycled concrete and BFRP bars decreases with increasing temperature. The trend of peak bond strength is shown to increase at the begining and then decrease with the increase of temperature. With temperature increasing, the peak bond strength of specimens without mixed fibers decreases accordingly. The bond-slip curves are established and the curves cohere to the experimental results well. This study provides some reference for the bonding performance of BFRP bars with fiber-reinforced recycled-aggregate concrete.

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刘华新,朱伯衡. 高温对玄武岩纤维筋混杂纤维再生混凝土粘结性能的影响[J]. 科学技术与工程, 2022, 22(5): 2049-2054.
Liu Huaxin, Zhu Boheng. Effect of high temperature on Bond Behavior between BFRP Bars and Hybrid Fiber Recycled Aggregate Concrete[J]. Science Technology and Engineering,2022,22(5):2049-2054.

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  • 收稿日期:2021-07-09
  • 最后修改日期:2021-11-26
  • 录用日期:2021-08-19
  • 在线发布日期: 2022-02-10
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