Investigation of the bond properties between hybrid fiberreinforced concrete and BFRP bars after exposure to high temperature

Zhenrong Liu; Huaxin Liu; Weixing Xu; Beibei Liu; Yue Zhong; Jian Geng; Genjin Liu

doi:10.3989/mc.2024.361123

Authors

Zhenrong Liu Liaoning University of Technology https://orcid.org/0009-0004-5947-8030
Huaxin Liu College of Civil and Architectural Engineering, Liaoning University of Technology, https://orcid.org/0000-0003-1012-3963
Weixing Xu School of Architecture, Tianjin University https://orcid.org/0000-0002-5180-8814
Beibei Liu School of Architecture, Tianjin University https://orcid.org/0009-0007-1955-415X
Yue Zhong Centre for Infrastructural Monitoring and Protection, School of Civil and Mechanical Engineering, Curtin University https://orcid.org/0000-0002-3355-7097
Jian Geng School of Civil Engineering, NingboTech University https://orcid.org/0000-0003-0484-2371
Genjin Liu School of Civil Engineering, NingboTech University https://orcid.org/0000-0002-5128-9874

DOI:

https://doi.org/10.3989/mc.2024.361123

Keywords:

High temperature, BFRP bar, Hybrid fiber-reinforced concrete, Microscopic morphology, Bond properties

Abstract

This research investigated the bond properties at high temperatures and with hybrid fiber addition between basalt fiber reinforced polymer (BFRP) bars and hybrid fiber-reinforced concrete (HFRC). The tensile strength and appearance morphology of BFRP bars were analyzed. Used scanning electron microscopy (SEM) to examine the microscopic morphology and used the bond-slip constitutive model to fit the bond-slip curves. When BFRP bars after exposed to 300 °C, their tensile strength dropped by 42%. With the increasing temperature, the bond strength and stiffness of normal concrete (NC) specimens decreased by 27.3 % and 67.5 %, respectively, while HFRC specimens decreased by 20.8 % and 55 %, respectively. Hybrid fibers increased the bond strength and stiffness of HFRC specimens by 27.1 % and 49.1 %, respectively. The best fitting models were the Malvar model and the Continuous Curve model.

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