Diffusion Coefficient Model and Impact Analysis of Different Asphalt Rejuvenators
In order to meet the demand for efficient asphalt rejuvenators in road engineering,the research established a prediction model for the behavior of rejuvenator according to free volume theory.Parameters in the model were calculated based on the functional group contribution and parameter fitting method.To verify the accuracy,a simulation method was adopted to get the simulated diffusion values.The results of the diffusion coefficients from different methods showed that the diffusion coefficient model could effectively predict the diffusion coefficient of rejuvenators in aged asphalt.The research concurrently examined the variables affecting diffusion activity,using the formulated model to analyze how intermolecular interactions,temperature,and the diffusion coefficient were interconnected.Results showed that the intermolecular interaction between the aromatic-based rejuvenator and asphalt was higher,and the diffusion speed of the aromatic-based rejuvenator was faster.With the increase in temperature,the molecular diffusion of the saturated fraction regenerant accelerated.When the temperature is 400 K,the diffusion coefficients of the saturate-based rejuvenators are greater than that of the aromatic-based rejuvenator.The above results indicate that when selecting rejuvenators,attention should be paid to the influence of temperature and chemical structure of internal molecules on rejuvenation efficiency.
RejuvenatorFree volumeDiffusionAged asphaltMaterial studio
国家科技期刊平台
NSTL
万方数据
维普
