Optimization of Absorbing Aggregates for Microwave Deicing and Design of Concrete Pavement Absorbing Functional Layer

Microwaves can easily penetrate the ice,selectively heat the pavement surface and destroy the adhesion of ice to the road surface,com- pared with the traditional deicing method. This work develops a novel microwave absorbing function layer of concrete pavement. Firstly, the microwave heating characteristics,microwave durability,aggregate-matrix interface bond adhesion,and the economics of absorbing aggregates and limestone were comprehensively analyzed. One absorbing aggregate with better comprehensive performance was determined. The heating rate of the various particle size of microwave absorbing aggregate,the influence of the mechanical properties of the concrete after limestone replacement,and the tendency of upper and lower surfaces and their temperature difference of the various thickness microwave absorbing concrete were explored. And the optimal replacement particle size and the thickness of the absorbing function layer were recommended. Finally, the effect of graphite content on microwave heating performance and mechanical strength was studied,and the optimal content was determined. The results show that magnetite has better comprehensive properties;magnetite with a particle size of 16—19 mm has the best heating rate,and the strength of the microwave absorbing concrete prepared by replacing the corresponding limestone is higher than that of ordinary concrete. The thickness of the microwave-absorbing concrete functional layer is 5 cm to ensure optimal material utilization. At the same time,3% graphite content can improve the uniformity of microwave heating and satisfy the mechanical requirements. The research results can provide a reference for microwave deicing applications and road and airport pavement. © 2024 Cailiao Daobaoshe/ Materials Review. All rights reserved.