An Ultra-Thin, Microwave-Absorbing Wear Layer for Pavement Deicing

Abstract

Microwave heating is widely employed in pavement deicing. However, it is difficult to improve the deicing efficiency because only a small part of the microwave energy is used and most of it is wasted. To improve the utilization efficiency of microwave energy and the deicing efficiency, we used silicon carbide (SiC)–replaced aggregates in asphalt mixtures to prepare an ultra-thin, microwave-absorbing wear layer (UML). The SiC particle size, SiC content, oil–stone ratio and thickness of the UML were determined. The effect of the UML on energy saving and material reduction was also evaluated. Results show that only a 10 mm UML was needed to melt a 2 mm ice layer within 52 s at −20 °C and rated power. In addition, the minimum layer thickness to meet the specification requirement (≥2000 με) of asphalt pavement was also 10 mm. SiC with larger particle sizes increased the temperature rise rate but decreased the temperature uniformity, instead increasing the deicing time. The deicing time of a UML with SiC particle size less than 2.36 mm was 35 s shorter than that of a UML with SiC particle size greater than 2.36 mm. Furthermore, more SiC content in the UML resulted in a higher temperature rise rate and less deicing time. The temperature rise rate and deicing time of the UML with 20% SiC were 4.4 times and 44% of those of the control group. When the target void ratio was 6%, the optimum oil–stone ratio of UML was 7.4%, and it had good road performance. Compared to overall heating, the UML saved 75% of power and SiC material under the same heating efficiency. Therefore, the UML reduces microwave deicing time and saves energy and material.

Enhanced Microwave Deicing Capacity of Cement Pavement with Carbon Fiber Screens

“…According to interference theory, an electromagnetic wave is strongly absorbed when the distance d between two reflecting surfaces and the wavelength λ of the incoming wave fulfills Equation (10) [40]:…”

“…In recent years, materials that strongly absorb microwaves have been added to or have replaced the materials in roads to enhance the ability to deice these roads with microwaves [1][2][3][4][5][6]. Among these materials, layered pavement combining microwaveabsorbent materials and structures has shown excellent deicing performance [7][8][9][10][11]. Therefore, combining microwave-induced deicing pavement with microwave-absorbing structures has broad application prospects.…”

Temperature Field Characterization of Iron Tailings Based on Microwave Maintenance Technology

“…Furthermore, modified asphalt pavements with wave-absorbing materials have shown promising healing effects and significant energy savings [23,24]. Currently, most scholars focus on optimizing the wave-absorbing performance of asphalt mixtures through the development of new materials [25][26][27]. However, they often overlook the high cost of wave-absorbing materials and the challenges associated with achieving uniform temperature distribution and aggregate gradation in the asphalt mixtures.…”