Mechanism based diffusion-reaction modelling for predicting the influence of SARA composition and ageing stage on spurt completion time and diffusivity in bitumen

Diffusion-reaction models derived within the frame of continuum thermodynamics irreversible processes for reacting mixtures enjoy a number advantages over purely phenomenological models. This paper explores potential and challenges this approach by means particular model spurt oxidation in bitumen. Film ageing experiments are simulated considering different bitumen compositions terms SARA fractions. The predicted completion times contrasted with parameters characterizing initial composition. results demonstrate consistency model. Furthermore, trend regarding time is line experimental from Strategic Highway Research Program (SHRP). In addition, change diffusivity due to discussed compositions. consistently predicts significant decrease absence out-diffusion reaction products.