玄武岩纤维筋与玄武岩纤维煤矸石混凝土的黏结性能研究OA

To investigate the bond performance between BFRP bars and spontaneous combustion coal gangue ag-gregate concrete,a central pull-out test was conducted to analyze the effects of the coal gangue fine aggregate replace-ment 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 aggre-gate 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 relation-ship between the BFRP bar and the coal gangue aggregate concrete.This study can provide a reference for the re-source utilization of coal gangue and the design of BFRP-reinforced concrete structures.