Phase change materials (PCMs) can regulate the temperature of asphalt pavement through latent thermal energy storage. Composite phase change materials using lightweight aggregate as supporting material have been used in asphalt pavement. This work aims at investigating the effect of lightweight aggregate gradation on latent heat storage capacity of asphalt mixture for achieving satisfactory cooling effect. Polyethylene glycol (PEG) was incorporated in three kinds of fly ash ceramsite (FACS) with different particle size ranges (2.36–4.75 mm, 4.75–9.5 mm and 9.5–13.2 mm) to prepare composite PCMs (PEG/FACS) by a vacuum adsorption method. The results of differential scanning calorimeter test showed that the composite PCMs with smaller particle size had larger latent heat. The leakage experiment confirmed that the composite PCMs coated with cement paste (C-PEG/FACS) had good thermal exudation stability. Two kinds of asphalt mixture, AC-13 and SMA-13, were prepared by replacing aggregate with C-PEG/FACS. For AC-13 gradation, the asphalt mixture prepared with C-PEG/FACS (2.36–4.75 mm) presented the best cooling effect and the lowest strength reduction, compared with control asphalt mixture. As for SMA-13 gradation, the asphalt mixture using C-PEG/FACS (4.75–9.5 mm) had the best cooling effect, but the asphalt mixture prepared with C-PEG/FACS (2.36–4.75 mm) presented the lowest strength reduction. The results of the paper indicated that it is necessary to select reasonable lightweight aggregate gradation as PCM-supporting material for different types of asphalt mixture, in order to achieve satisfactory cooling performance and minimize the strength reduction of asphalt mixture.

相变材料（PCM）可通过潜在的热能存储来调节沥青路面的温度。使用轻质骨料作为支撑材料的复合相变材料已用于沥青路面。这项工作旨在研究轻质骨料级配对沥青混合料潜热储存能力的影响，以实现令人满意的冷却效果。将聚乙二醇（PEG）掺入三种具有不同粒径范围（2.36-4.75 mm，4.75-9.5 mm和9.5-13.2 mm）的粉煤灰陶粒（FACS）中，以真空制备复合PCM（PEG / FACS）吸附法。差示扫描量热仪测试结果表明，粒径较小的复合相变材料具有较大的潜热。泄漏实验证实，涂有水泥浆的复合PCM（C-PEG / FACS）具有良好的热渗出稳定性。用C-PEG / FACS代替骨料制备了两种沥青混合料AC-13和SMA-13。对于AC-13级配，与对照沥青混合料相比，用C-PEG / FACS（2.36-4.75 mm）制备的沥青混合料表现出最佳的冷却效果和最低的强度降低。至于SMA-13级配，使用C-PEG / FACS（4.75–9.5 mm）的沥青混合物的冷却效果最佳，但使用C-PEG / FACS（2.36–4.75 mm）制备的沥青混合物的强度降低最小。 。结果表明，针对不同类型的沥青混合料，有必要选择合理的轻质骨料级配作为PCM支撑材料，