Abstract: To study the micromechanical properties and self-healing mechanism of vegetable oil microencapsulated asphalt mixture, the asphalt microcracks model was constructed based on the 12-molecule asphalt model by molecular dynamics methods. Oleic acid, linoleic acid, and ethyl tetralin were used as the core material of the microcapsules. The self-healing process of asphalt microcracks was investigated during the release of core materials. And the self-diffusion coefficients of asphalt molecules were calculated to explore the healing mechanism with different core materials. Moreover, the asphalt-aggregate interface model was constructed, and indexes including cohesion energy, adhesion energy, and adhesion strength were used to analyze the microscopic properties of the asphalt-aggregate interface incorporating different core materials. The results implied that the release of the core material accelerated the self-diffusion of asphalts, improved the self-healing efficiency of micro-cracks, and the self-healing efficiency increased with temperature. Due to the release of core materials, the cohesion energy and adhesion energy of aged asphalts increased by more than 37.2% and 36.8%, and the adhesion strength of the interface was also improved. Furthermore, compared with petroleum-based regenerant, vegetable oil could be better in promoting micro-cracks healing. Molecular dynamics could be utilized in deeply exploring the self-healing mechanism of microcapsule asphalt pavement, and providing a feasible method for the design and selection of microcapsule core materials.
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2024, Vol. 38 
