Research On Techniques Of Snow-melting And Deicing Pavement Basing On Microwave And Magnet Coupling Effect

To clear the ice on the road rapidly and effectively, Engineers at home and abroad are getting into the swing of their work on the new techniques for snow-melting and deicing. Microwave deicing is considered as a new type of environmental friendly deicing method which can deice rapidly and drastically. The traditional material has the low absorbed efficiencies for microwave that the microwave deicing speed is very slowly.The paper presents paving asphalt concrete with magnetite aggregates which have a high absorbing efficiency for microwave instead of traditional aggregates. In this thesis, the author systemically study on mechanism of microwave and magnet coupling effect, mix design and structure design of magnetite asphalt concrete pavement, microwave deicing efficiency and deicing technology.By the laboratory tests of magnetite aggregate and asphalt mixture, the technical standards of magnetite aggregate, design method of the aggregate graduation and the ability of shrinkage crack resistance test of magnetite asphalt mixture were putting forward. According to the characteristics of magnetite asphalt concrete layer, structure forms, structure layer thickness and structure design procedures of the magnetite asphalt pavement suitable for newly-built road, bridge deck pavement and reconstruction road respectively are put forward.According to the test results of magnetite asphalt concrete’s dielectric constant and complex magnetic permeability and magnetite aggregate’s microwave heating, the mechanism of microwave and magnet coupling effect was revealed by theoretical analysis. The magnetite asphalt pavement’s microwave deicing model was set up and the computer simulation of microwave deicing was achieved. The reasonable time of microwave heating was confirmed by analyzing the regularity for change of ice layer junction’s tempreture.By theoretical analysis, microwave deicing tests and computer simulation results, the influence law was studied, which was magnetite aggregate’s grade and amount, environmental temperature, ice layer’s thickness and the factors of microwave field to microwave deicing efficiency. The conversion relationships of wicrowave absorption coefficient, deicing efficiency and magnetite aggregate’s grade and amount were founded; the minimum grades of magnet ore were presented to achieve rapid deicing under different conditions of wacrowave frequency and environmental temperature.