Study On Microwave Heating Technology And Equipment On The Utilization Of Old Asphalt Mixture

There exits many drawbacks in the traditional technology of heating old asphalt mixture in central plant hot recycling technology,such as a waste of energy,serious environmental pollution and degradation of old asphalt.Microwave heating has strong ability to dehumidify, avoids asphalt degradation that can be caused by exposure to extreme high temperature and improve the efficiency of regeneration.For the realization of this heating mod in the central plant hot recycling technology,the paper does some researches about the technology and equipment which uses microwave to heat old asphalt mixture.1.The experiment about the dehumidification effect of microwave heating is tested.The result proves that the dehumidification effect and heating efficiency can meet the request in the central plant hot recycling technology and ventilation does little impact on the heating efficiency.2.The experiment about the effect of frequency and aggregate is tested.The result proves that old asphalt mixture which is heated by microwave whose frequency is 5.8GHz has worse performance than 2.45GHz,so the paper chooses 2.45GHz as the frequency of microwave.For the factor of aggregate,the paper finds that old asphalt mixture whose aggregate is basalt has higher heating efficiency than granite and limestone and also finds that the smaller grain diameter of basalt,the higher heating efficiency.3.On the foundation of experiments,a test equipment to heat old asphalt mixture using microwave is designed.The equipment includes microwave heater system and transporting system.4.The experiment about the heating efficiency of the test equipment is tested.The result proves that the higher the water ratio,the higher heating efficiency.When the water ratio is 3%,the heating efficiency of the equipment is about 65%.5.The experiment about the temperature stability of hot mixed asphalt and the heating efficiency when the equipment works for a long time is tested.The result proves that the equipment has good overall heating capability and working stability.