Study on the Dielectric Constant of Asphalt Mixture with High-Volume Steel Slag Used for Microwave Heating

Microwave heating can be applied for the ice and snow melting and self-healing of asphalt pavement. The efficiency of microwave heating is subject to the dielectric constant of the material, the working frequency, and the depth of penetration of the electromagnetic wave. The purpose of this paper is to reveal the effect of steel slag content and frequency of microwave on the heating efficiency penetration depth. Compared with the mineral aggregate asphalt mixture, the heating rate of steel slag asphalt mixture dramatically increases under microwave heating. Microwaves at a frequency of 2.45GHz are recommended for asphalt surface layers over 40cm thick, while those at 5.8GHz are recommended for layers over 20 cm.