Key Models of Heat and Mass Transfer of Asphalt Mixtures Based on Microwave Heating

Asphalt mixtures are simplified for porous media to study the heat and moisture transportation law based on the multiphysics transfer process of microwave heating. Electromagnetic diffusion and heat transfer models of asphalt mixtures are built. The heat and mass transfer model of moisture is also studied. The models prove capable of predicting the temperature field of recycled asphalt mixtures based on a microwave heating experiment. The pressure gradient increases with the increase in the heating temperature. The center heating region temperature is higher than that of the surrounding region as observed through temperature field simulation. The results can simulate the technical process of hot in-place recycling of asphalt mixtures and provide the theoretical basis for the structural design of heaters.