Research on the bonding performance of BFRP bars and basalt fiber coal gangue concrete

doi:10.19936/j.cnki.2096-8000.20260728.007

Abstract

Abstract: To investigate the bond performance between BFRP bars and spontaneous combustioncoal gangue aggregate concrete, a centralpull-out test was conducted to analyze the effects of the coal gangue fine aggregate replacement rate and basalt fiber volume fraction on interfacial bond behavior. The applicability of a typical bond-slip model was also evaluated. The experimental results show that the main interfacial failure modes between the BFRP bar and the coal gangue concrete are splitting failure and pull-out failure. An appropriate amount of coal gangue fine aggregate can significantly improve the interfacial bond performance. The peak bond strength reaches its maximum when the replacement rate is 25%, while further increases in the replacement rate lead to a decrease in bond performance due to the higher porosity of the aggregate. Basalt fibers have a significant reinforcing effect on interfacial properties; the bond strength initially increases and then decreases with increasing fiber volume fraction, with 0.15% being the optimal fraction. Model comparison results show that the CMR model can accurately describe the bond-slip relationship between the BFRP bar and the coal gangue aggregate concrete. This study can provide a reference for the resource utilization of coal gangue and the design of BFRP-reinforced concrete structures.

Key words: BFRP bar, coal gangue concrete, bond performance, constitutive model, basalt fibers

CLC Number:

TB332

LI Kun, LIU Huaxin, LIU Zhenrong. Research on the bonding performance of BFRP bars and basalt fiber coal gangue concrete[J]. COMPOSITES SCIENCE AND ENGINEERING, 2026, 0(7): 57-65.

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