Ultraviolet aging mechanism of asphalt molecular based on microscopic simulation

In order to reveal the nature of Ultraviolet aging(UV-aging) behavior asphalt molecules, dynamic microstructure during ultraviolet aging was simulated by Materials Studio software. The effect UV on transformation, aggregation and motion state is analyzed changes in energy, microstructural morphological variation, glass transition temperature viscosity molecular system. results show that Satruate Aromatic provide active force for Asphaltene Resin bonding molecules. As progresses, lightweight components molecule gradually transform into heavy components. enhances degree molecules increasing distribution width between components, which improves high-temperature resistance asphalt. At meantime, causes movement solidify at low so rheological difficult occur reducing component free volume temperature, reduces low-temperature addition, among factors affecting molecular, structure weight significantly greater than activity. Adding short-chain alkanes, multi-branched long-chain alkanes preventing synthesis condensed nucleus compounds UV-aged could effectively reduce improve flowability asphalt, thus enhancing study contribute understanding characteristics pattern aging, achieve interpretation prediction properties microscopic level.