Road performance of cold repaired asphalt mixture with new green maintenance materials

Cold patched asphalt mixture plays a crucial role in road maintenance, providing flexibility and the ability to quickly recover from harsh weather conditions. This article conducts in-depth research on the performance of cold patched asphalt mixture through multiple experiments, with special attention paid to the influence of diluent content and curing conditions on its performance. The experimental results show that using a mixture of green curing agents is feasible, and the diluent content is one of the main factors affecting the physical properties of cold patched asphalt. The optimal content of asphalt diluent was determined to be 25% through mass evaporation experiments and rotational viscosity experiments. Meanwhile, it was found that single component polyurethane prepolymers and SBS curing agents have a negative impact on the adhesion of cold patched asphalt, but have an improving effect on its strength, high-temperature resistance, and water stability. After comparing the performance of cold patched asphalt mixtures under different curing conditions, it was found that the performance of cold patched materials with long-term curing was better. Finally, this study determined the optimal dosage ratio of base asphalt, bio oil diluent, and single component polyurethane prepolymer as 100:25:12, providing technical support for the design and application of cold patched asphalt concrete pavement under high adverse weather conditions.