Study on the rheological properties and phase-change temperature regulation of asphalt modified by high/low-temperature phase change material particles

The temperature sensitivity of asphalt can be improved by blending phase change materials into asphalt through the effect of phase change temperature control. In this study, two types of phase change material particles with excellent heat resistance were prepared by vacuum adsorption method. Based on material preparation, phase change material particles with different phase change temperature intervals were blended into asphalt to prepare a composite modified asphalt. Furthermore, the composite modified asphalt's rheological properties and tem-perature regulation effects were analyzed. The results showed that the incorporation of phase change material particles improved the rutting factor of the composite modified asphalt. The aging resistance of the composite modified asphalt increased significantly with the increase of the proportion of low-temperature phase change material particles. Bending beam rheometer (BBR) test results showed that incorporating high/low-temperature phase change material particles did not significantly affect the low-temperature rheological properties. Ac-cording to temperature regulation simulation, it was found that the temperature change rate affects the tem-perature regulation effect of the composite modified asphalt. With increasing the temperature change rate, the maximum temperature difference increases, the latent heat accumulation temperature value (LHATV) decreases, and the latent heat temperature regulation index (LHTI) increases.