Diffusion behavior of waste vegetable oil recycled asphalt based on molecular dynamics
In order to study the effects of different amounts of waste vegetable oil,diffusion temperature and time on the mutual diffusion behavior between waste vegetable oil and aged asphalt,a three-layer mo-lecular diffusion model considering the change of asphalt aging degree with the depth of asphalt film was proposed.Combined with Fourier transform infrared spectroscopy(FTIR)test and macroscopic softening point test,the mutual diffusion behavior between waste vegetable oil regenerant and aged asphalt was ana-lyzed.The results show that the waste vegetable oil regenerant realizes the regeneration of aged asphalt by supplementing the light components in the aged asphalt and reducing the agglomeration of asphaltene.The increase of temperature,waste vegetable oil content and diffusion time will enhance the mutual diffusion efficiency of waste vegetable oil and aged asphalt,and the influence of temperature is the most significant.However,as the temperature increases,the increase in diffusion efficiency decreases.The results of Pear-son correlation analysis show that the diffusion coefficient between simulation and macro is significantly correlated,and the three-layer molecular diffusion model can effectively characterize the mutual diffusion behavior of rejuvenator and aged asphalt.
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