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In this paper, an efficient and non-destructive separation route of road marking from asphalt pavement was reported firstly via microwave directional heating. By accurately focusing microwave energy on a thin film and making it high temperature, the markings can be easily separated from the pavement surface. Microwave heating test results showed that when 25%wt composite microwave absorbent were added to the bonding layer and impedance-matching layer respectively, the heating rate of impedance-matching marking specimen surface was 34.56℃/min, 73.72% higher than that of the control group. The marking removal efficiency was calculated via Matlab digital image processing technology, showed that the average removal efficiency of impedance-matching marking specimens were 100.00%. The above findings show that marking removal method proposed in this study could significantly reduce the difficulty of removing markings on asphalt pavements and greatly improve the removal efficiency.

An efficient non-destructive separation method of road marking from asphalt pavement by microwave directional heating