Performance study of polyurethane/silicon carbide composite repairing asphalt pavements

Polyurethane (PU)/silicon carbide composites, which can rapidly repair cracked asphalt pavements, were synthesized by addition polymerization. The materials were characterized by Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), X-ray diffraction (XRD) and mechanical performance tests. Liquid diphenylmethane diisocyanate (L-MDI) type prepolymer/toluene diisocyanate (TDI-80) type prepolymer weight ratio, curing agent and silane coupling agent 3-aminopropyltriethoxysilane (KH550) were investigated mainly in this paper. In addition, silicon carbide was treated with KH550. Results show that the crystal structure of silicon carbide had subtle changes and the correct amount of KH550 can enhance the mechanical performance and thermal endurance.