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Experimental study on bond behavior between BFRP bars and seawater sea-sand concrete

BFRP 筋与海水海砂混凝土黏结性能的试验研究

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Abstract

Combining fiber reinforced polymer (FRP) with seawater sea-sand concrete (SSC) can solve the shortage of river sand that will be used for marine engineering construction. The bond performance of BFRP bars and SSC specimens is researched by pull-out test in this paper. The effects of the parameters, such as bar type, bar diameter, concrete type and stirrup restraint, are considered. It is beneficial to the bonding performance by the reduction of bar diameter. The utilization of seawater sea-sand has a low influence on the bond properties of concrete. The bond strength of BFRP is slightly lower than the steel rebar, but the difference is relatively small. The failure mode of the specimen can be changed and the interfacial bond stress can be improved by stirrups restraint. The bond-slip curves of BFRP ribbed rebar include micro slip stage, slip stage, descent stage and residual stage. The bond stress shows the cycle attenuation pattern of sine in the residual stage. In addition, the bond-slip model of BFRP and SSC is obtained according to the experimental results and related literature, while the predicted curve is also consistent well with the measured curve.

摘要

纤维增强聚合物材料(FRP)与海水海砂混凝土(SSC)结合可以解决海洋工程建设中的河砂短缺问题。 本文通过拉拔试验研究了BFRP 筋与海水海砂混凝土的粘结性能。 考虑了筋材类型、筋材直径、混凝土类型和箍筋约束等参数的影响。 减小筋材直径有利于提高粘结性能,海水海砂的利用对混凝土的粘结性能影响不大,BFRP 的粘结强度比钢筋略低,但差别较小。 箍筋约束可以改变试件的破坏模式并在一定程度上提高界面粘结应力。 带肋BFRP 筋的粘结-滑移曲线包括微滑阶段、滑移阶段、下降阶段和残余阶段,且残余阶段粘结应力呈正弦式循环衰减形式。 此外,基于实验结果和相关文献得到了BFRP 筋和海水海砂混凝土的粘结滑移模型,预测的曲线与实测曲线有很好的一致性。

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Funding

Project(BE2019642) supported by the Jiangsu Provincial Key Research and Development Program, China

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Authors and Affiliations

  1. Jiangsu Key Laboratory of Environmental Impact and Structural Safety in Engineering, School of Mechanics & Civil Engineering, China University of Mining and Technology, Xuzhou, 221116, China

    Xun Su  (苏迅) & Shi-ping Yin  (尹世平)

  2. State Key Laboratory for Geomechanics & Deep Underground Engineering, School of Mechanics & Civil Engineering, China University of Mining and Technology, Xuzhou, 221116, China

    Xun Su  (苏迅), Shi-ping Yin  (尹世平), Ying-de Zhao  (赵瑛德) & Yun-tao Hua  (华云涛)

Authors
  1. Xun Su  (苏迅)
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  2. Shi-ping Yin  (尹世平)
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  3. Ying-de Zhao  (赵瑛德)
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  4. Yun-tao Hua  (华云涛)
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Contributions

The overarching research goals were developed by SU Xun, YIN Shi-ping, ZHAO Ying-de, and HUA Yun-tao. SU Xun and YIN Shi-ping provided the measured landslides displacement data, and analyzed the measured data. SU Xun, YIN Shi-ping, and ZHAO Ying-de established the models and calculated the predicted displacement. SU Xun and HUA Yun-tao analyzed the calculated results. The initial draft of the manuscript was written by SU Xun, YIN Shi-ping, ZHAO Ying-de, and HUA Yun-tao. All authors replied to reviewers’ comments and revised the final version.

Corresponding author

Correspondence to Shi-ping Yin  (尹世平).

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Conflict of interest

SU Xun, YIN Shi-ping, ZHAO Ying-de, and HUA Yun-tao declare that they have no conflict of interest.

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Su, X., Yin, Sp., Zhao, Yd. et al. Experimental study on bond behavior between BFRP bars and seawater sea-sand concrete. J. Cent. South Univ. 28, 2193–2205 (2021). https://doi.org/10.1007/s11771-021-4762-2

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  • DOI: https://doi.org/10.1007/s11771-021-4762-2

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