Effect of graphite heat transfer channels and specific heat capacity on thermal properties of asphalt mixture

This research investigated the effect of graphite heat transfer channels and the specific heat capacity of aggregates on asphalt pavement heat accumulation. Graphite channels were designed and embedded in the middle layer of asphalt samples to study heat absorption, transfer and the cooling process. Dynamic creep tests were conducted at 40°C and 60°C to assess rutting performance. The findings showed that specimens with lower specific heat capacity exhibited more efficient heat transfer. Graphite channels led to a notable temperature reduction in the upper and middle layers, by 4.8°C and 4.9°C, respectively. Moreover, the specimen containing granite aggregates and three channels demonstrated a quicker temperature drop during the cooling process once thermal radiation ceased. According to the creep test results, samples incorporating heat transfer channels displayed a higher Flow Number compared to control specimens, indicating improved resistance to permanent deformation.