Research on the Thermal Performance and Microscopic Mechanism of Asphalt under Microwave Action
With the rapid development of China's highway transportation,early designed roads have devel-oped various diseases due to poor performance and environmental impacts,making road maintenance par-ticularly important.Traditional hot recycling technology for asphalt pavements has many shortcomings,while microwave heating technology has attracted much attention due to its advantages of uniform,rapid,and environmentally friendly heating.This study is based on the application of microwave technology in the maintenance of asphalt roads.Through numerical simulation and experiments,the impact of micro-wave powers of 900 W,1 300 W,and 1 700 W on the temperature of asphalt blocks at depths of 2 cm and 4 cm after heating for 20 minutes was investigated.Furthermore,Fourier Transform Infrared Spec-troscopy(FTIR)and X-ray Diffraction(XRD)analysis techniques were used to further study the mo-lecular composition and microstructure of the asphalt blocks.The results showed that when the microwave power was at 1 700 W,the temperature of the asphalt block at 2 cm depth reached 141.4℃,and at 4 cm depth reached 163.1℃,both of which met the milling and paving temperature required in the as-phalt pavement recycling process.The temperature at 2 cm depth was slightly lower than that at 4 cm depth,indicating the penetrating ability of microwaves.Moreover,the use of microwave technology had minimal impact on the microstructure of the asphalt.Microwave heating technology can effectively repair old road diseases and extend the service life of the road surface,which is of great significance for impro-ving the efficiency and environmental friendliness of road maintenance.
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