Effect of high-temperature-resistant epoxy resin/polyethylene glycol 2000 composite stereotyped phase change material particles on asphalt properties

• PCMs used in asphalt was developed. • EPPCM has good thermal stability. • EPPCM improves the rheological properties of asphalt at high and low temperatures. • EPPCM effectively regulates asphalt temperature. • EPPCM improves the specific heat capacity of asphalt. In this study, epoxy resin/polyethylene glycol 2000 composite stereotyped phase-change material (EPPCM) particles were prepared. It was found that the phase change thermal storage properties were almost unchanged after heat treatment when the thermal decomposition onset temperature reached 230 °C according to Differential scanning calorimetry (DSC) analysis and Thermogravimetric analysis (TGA) test. Modified asphalt with increasing particle doping was prepared by high-speed shearing. Dynamic shear rheological (DSR) test, Bending beam rheometer (BBR) test, temperature regulation test and specific heat capacity test were carried out on modified asphalt. The results show that with the increase in EPPCM doping, gradual improvement of rheological properties of modified asphalt appeared, and there was an increasing trend occurred in the temperature regulation effect. The maximum temperature difference reached 4.3 °C and the specific heat capacity of asphalt increased as well.