Open Access

ARTICLE

Bond Behavior between BFRP Bars and Hybrid Fiber Recycled Aggregate Concrete after High Temperature

by Boheng Zhu¹, Huaxin Liu^1,*, Genjin Liu², Abasal Hussain², Xiaofei Zhang³, Xuezhi Wang¹

1 College of Civil and Architectural Engineering, Liaoning University of Technology, Jinzhou, 121000, China
2 State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian, 116024, China
3 Institute of Water Resources and Hydro-electric Engineering, Xi’an University of Technology, Xi’an, 710048, China

* Corresponding Author: Huaxin Liu. Email:

(This article belongs to the Special Issue: Recycled Concrete Towards a Sustainable Society)

Journal of Renewable Materials 2021, 9(3), 507-521. https://doi.org/10.32604/jrm.2021.013580

Received 11 August 2020; Accepted 30 September 2020; Issue published 14 January 2021

Abstract

The aim of this study is to improve the bond performance of basalt fiber reinforced polymer (BFRP) bars and recycled aggregate concrete (RAC) after being exposed to high temperatures. The bond behavior (failure modes, bond strength, bond stress-slip curves) between BFRP bars and hybrid fiber recycled aggregate concrete (HFRAC) after being exposed to temperatures ranging from 20°C up to 500°C was studied by using pull-out tests. The effect of high temperatures on mechanical properties of concrete (compressive strength, splitting tensile strength) and tensile strength of BFRP bars was also investigated. The bond strength decreased as the temperature increased and the drop of bond strength between RAC and BFRP bar was larger than that between HFRAC and BFRP bar. As the temperature rises, the key factor affecting the bond strength was gradually transformed from concrete strength to BFRP bar strength. The relationship between bond stress and slip in the dimensionless bond stress-slip ascending section was established, which was in good agreement with the experimental results.

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Keywords

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