Study on the Thermoregulation Mechanism of Temperature In-Sensitive Asphalt Pavement

Incorporating phase change materials into asphalt concrete and utilizing phase change heat transfer to control the temperature of asphalt pavement can effectively reduce the impact of high-temperature diseases on the durability of asphalt pavement. In this study, microencapsu-lated composite phase change materials were prepared by using calcium alginate and PEG1500, and mixed into SMA-13 Marshall specimens for indoor high temperature tests. The test results showed that the temperature of the specimen was reduced by about 1.5 °C when the doping amount of the composite phase change material was 2.4% and the oven temperature was 60 °C. In order to further investigate the application of phase change energy storage materials in asphalt pavement structure, this paper used Comsol finite element software to simulate the summer temperature field of asphalt surface layer. A three-layer asphalt pavement model consisting of 4 cm SMA-13, 6 cm AC-20, and 8 cm AC-25 was established to study the effect of phase change materials on the temperature change of the pavement. The results of the study showed that the addition of 2.4% of the composite phase change material to each of the top and mid surface layers could keep the temperature of all layers of the pavement outside of the asphalt dynamic stability plunge temperature.