A review of recent developments and challenges of using phase change materials for thermoregulation in asphalt pavements

The regulation of asphalt pavement temperature is crucial in ensuring its durability, promoting traffic safety, and preserving the environment. Phase change materials (PCMs) can play a critical role in preventing thermal distress of asphalt pavements as thermoregulation units. This paper presents a comprehensive review of the classification and performance requirements of PCMs and the methods of synthetic and characterization of composite PCMs (CPCMs). Furthermore, the study delves into the thermoregulation effect of CPCMs and its influence on the performance of asphalt pavements. Results show that the organic solid-liquid PCMs and organic-organic eutectic PCMs meet the requirements of asphalt pavement in terms of phase change temperature, latent heat, thermal conductivity, durability, environmental compatibility, and economic viability, and therefore have a wide range of applications. However, the direct incorporation of PCMs can significantly affect both the performance and thermoregulation properties of the asphalt pavement. Therefore, it is crucial to utilize various methods to prepare CPCMs to avoid liquid leakage. The thermoregulation effect of CPCMs on asphalt pavements can be validated through both experimental characterization and numerical simulation, and the improvement in the mechanical strength of CPCMs holds potential for enhancing the rheological properties and overall performance of asphalt pavements. Furthermore, this paper provides an in-depth analysis of the areas in which CPCM preparation methods, performance characterization, and engineering applications still require further research. It is intended that this paper will serve as a valuable resource for relevant professionals and contribute to the advancement of knowledge in this field.