Abstract
Under the combined effects of heavy traffic loading and extreme environmental conditions, the failure issues of repaired potholes caused by insufficient interfacial bonding strength between the new and old pavement materials occur frequently, which severely impairs the durability of the repaired structure. This study aims to improve the interfacial bonding strength between the new and old pavement materials and prolong the service life of repair pothole materials. Firstly, the mechanical analysis was carried out using finite element simulation, and a technical measure was proposed to ensure improved interfacial bonding strength between new and old pavement materials. Secondly, emulsified asphalt (EA), light asphalt (LA), waterborne epoxy resin-modified emulsified asphalt (WER-EA) and silicone penetrant (SP) were selected to investigate the paving workability, viscosity changing and curing times of bonding materials at different temperatures. On this basis, the interlaminar shear and pull-out tests were performed under different paving mass, temperatures and humidity conditions, and the shear and pull-out strengths of four bonding materials were compared to optimize the type and paving mass of interface bonding material. The results show that an increase in bonding coefficient (BC) significantly reduces the values of pressure stress (σy) and pressure strain (εy), even the bucking depth of the pothole sides, thus decreasing the risk of pothole repair failure. Under normal or low-temperature conditions and field construction, SP has exceptional paving workability, and its shear and pull-out strengths are much higher than other bonding materials, with an optimum paving mass rate being 0.3 kg/m2 ∼ 0.4 kg/m2. The research results are of great significance in improving the pothole repairing level, standardizing the repair process and extending the service life of pavements.
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