Thermal and Pavement Performance of Asphalt Mixture Modified with Diatomite/Polyethylene Glycol Composite Phase Change Material
Asphalt pavements in hot areas of the South are prone to high-temperature damage,and the incorporation of phase change materials(PCMs)can address this issue.However,the research on the impact of phase change materials on the thermal performance and road performance of asphalt mixture is still relatively small.The main purpose of this study is to analyze the impact of diatomite/polyethylene glycol composite phase change material(DPCM)on the thermal performance and road performance of asphalt mixture.DPCM was mixed into AC-13 asphalt mixture at different dosages and volumes instead of fine aggregate.Firstly,the thermal performance of DPCM-modified asphalt mixture was evaluated,including thermal conductivity and thermal regulation performance.Then,the high-temperature stability and low-temperature crack resistance,water stability of DPCM-modified asphalt mixture were studied.The results show that DPCM can regulate the temperature of asphalt pavement by reducing the heating rate,and a cooling effect of 2 ℃ could be achieved.The road performance of asphalt mixture meets the requirements of the specification when the amount of DPCM is limited.However,with the increase of DPCM amount,the adverse effects of DPCM on high-temperature rutting resistance,low-temperature crack resistance and water stability gradually emerge.
NETL
NSTL
万方数据
