Influence of BFRP Mesh on UHPC Wet Bonding Performance

As an effective method of strengthening concrete in the marine environment, wet bonding has maintained an efficient application mode for many years. At present, research on the wet bonding behavior of UHPC is very rare, so in order to investigate the interfacial bonding performance between basalt fiber-reinforced plastic (BFRP) mesh cloth and ultra-high performance concrete (UHPC) under wet bonding conditions, forty-eight BFRP-UHPC specimens were carried out to investigate the influence of dry/wet bonding type, mesh depth, and mesh thickness on the interfacial bonding performance between BFRP and UHPC, and the failure mechanism of the BFRP-UHPC interface was revealed by SEM detection. The test results show that the interfacial wet bonding performance between BFRP and UHPC is better than that of the dry bonding process. With the increasing thickness of BFRP mesh, the interfacial bonding stress of dry and wet bonding shows the opposite trend, respectively. The fiber interlayer structure is the weak link of BFRP; with the increase in mesh depth, the bonding normal stress decreases gradually. When the mesh depth of wet-bonded BFRP is 5 mm, the reinforcement effect is the best, the maximum increase of interfacial bonding stress is 74%, and the tensile strength ratio is as high as 1.74. Compared with the traditional FRP reinforced construction without fiber mesh, the BFRP mesh structure can greatly improve the wet bonding performance, which can provide a theoretical and experimental basis for the design and construction of UHPC wet bonded with BFRP reinforcement engineering. Due to the form and distribution direction of steel fiber, a mechanical occluding effect will be generated at the BFRP mesh, so these two factors are very valuable for this wet bonding research field, for which the related work needs to further proceed.