Abstract
In order to enhance the microwave absorption efficiency of asphalt mixture, copper slag (CS) was used to partially replace natural aggregates in the hot mix asphalt (HMA). The effect was analyzed on heating rate, crack healing properties and mechanical performance of asphalt concrete. A fiber optic thermometer was employed to test the internal temperature of the specimen and heating rate at different heights in the mixture cylinder. Also, the surface temperature was recorded by the infrared thermometer. The effects of copper slag content, heating power and aging of the mix were investigated on the healing performance of the mixture through semicircle three-point bending tests. It was concluded that adding CS aggregates can significantly enhance microwave absorption properties and improve the heating rate of asphalt concrete. And, the heating power played an essential role in the heating rate and induced healing efficiency. The aggravation of aging degree had a negative impact on the healing efficiency. The incorporation of copper slag was also helpful for improving the mechanical properties of the mixture. Overall, the use of copper slag as aggregate in asphalt mixture is a good option when adopting microwave-induced heating technology to repair and maintain pavements.
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