Abstract：It is important for improving the microwave absorption capacity of asphalt concrete in order to promote the application of microwave heating in pavement maintenance. Based on the impedance matching theory, SiC-Fe3O4 binary composites were prepared and the network analyzer was used to measure the electromagnetic parameters of SiC-Fe3O4. Considering that it is difficult to measure the internal temperature of asphalt concrete using experimental methods, the heating rate and heat distribution of asphalt concrete was simulated by COMSOL Multiphysics. Finally, the pavement performance of asphalt concrete containing SiC-Fe3O4 was tested. The results show that when the mass ratio of SiC to Fe3O4 is 1∶2 (S1F2), the reflection loss of S1F2 reaches -22.12 dB, which is 13.97 dB lower than that of SiC. The heating rate of the asphalt concrete containing S1F2 is calculated as 0.322 ℃/s, which is 1.87 times that of control samples, and it is also higher than that of asphalt concrete containing either SiC (0.212 ℃/s) or Fe3O4 (0.231 ℃/s). Meanwhile, the asphalt concrete containing S1F2 has the most uniform heat distribution. It can be concluded that the asphalt concrete containing the binary composite of SiC-Fe3O4has excellent microwave absorption ability. At last, the results of Marshall immersion test showed that asphalt concrete containing S1F2 has better water resistance.
