5.8 Ghz Microwave Geothermal Regeneration Research Is Applied In Asphalt Pavement

In order to solve the problems of the 2.45 GHz microwave used in asphalt pavement maintenance as the longer heating time and high energy consumption when heating unit area, the paper brings forward the 5.8GHz microwave using in asphalt pavement maintenance.First, the magnetron power supply system of 5.8GHz was studied. The power supply circuit of 5.8GHz magnetron was designed.Two sizes of waveguides were designed to 5.8GHz magnetron. They were 60mm * 80mm and 92mm * 102mm. The two sizes of waveguides can meet the requirements by the test. Taking into account the composition of as little as possible of the magnetron microwave heating wall as large as possible, choose large diameter waveguide to do microwave application.Next by the research, the distance between the waveguide mouth and the road must be minimized in using 5.8GHz magnetron. The distance between the waveguide mouth and the road was about the distance 50mm.Taking into account the uneven of road surface and microwave heating microwave shielding wall needs CST and ANSYS simulation software were used to study the temperature rise and depth of heating asphalt pavement using 2.45 GHz and 5.8 GHz microwave. Then the experimental verification was carried through. The 5.8 GHz magnetron can be used effectively in asphalt pavement maintenance. The research results show that:The temperature rising rate of the 5.8GHz microwave heating asphalt pavement is 2-3 times of 2.45 GHz microwave in the distance within 0-75 mm of the asphalt concrete pavement.Heating 8-10 minutes, temperature rise within 0-75 mm of asphalt pavement can meet the asphalt road surface maintenance.The heating asphalt pavement depth of 5.8GHz microwave is half of the 2.45 GHz microwave which is about 7cm-8cm. Heating the same area of asphalt pavement to the same temperature, the input power of 5.8 GHz microwave maintenance equipment is 1 / 3 of the 2.45GHz microwave maintenance equipment. Last heating asphalt pavement performance was studied using 5.8GHz microwave. It found that heating of asphalt mixture using 5.8GHz microwave can meet the requirements of thermal regeneration.