Abstract:
In order to analyze the influence of basalt fiber reinforced polymer (BFRP) mesh on the bonding performance of ultra-high performance concrete (UHPC), the BFRP-UHPC interface pull-out bonding test (48 pieces) and shear test (21 pieces) were carried out respectively with three parameters of dry/wet bonding type, BFRP mesh anchorage depth and mesh thickness. The effects of BFRP mesh on the failure mode, bonding performance, shear stress slip curve, tensile ratio and toughness were studied. At the same time, the failure mechanism of BFRP-UHPC interface was revealed by SEM. The results show that the anchoring depth directly determines the failure mode of BFRP-UHPC interface. There is a positive correlation between tangential bonding stress and normal bonding stress. The wet bonding strength of BFRP-UHPC interface is higher than that of dry bonding process. With the increase of BFRP thickness and anchorage depth, the interfacial bonding stress between BFRP and UHPC shows a decreasing trend. Steel fiber has remarkable toughening effect on BFRP-UHPC interface, its end hook structure makes UHPC still have residual stiffness and strength after damage. When the anchoring depth of BFRP is 5 mm, the interface bonding stress reaches the maximum, the maximum increase of interface in the pull out bonding stress reaches 74%, and the tensile strength ratio is 1.74.