Study on Ultraviolet Aging Performance of Composite Modified Asphalt Based on Rheological Properties and Molecular Dynamics Simulation

In order to study the effect of UV aging on asphalt performance, four-component test, dynamic shear rheology and flexural creep stiffness test were combined with molecular dynamics simulation matrix rubber powder/styrene-butadiene rubber/polymerization. The properties phosphoric acid/epoxy resin modified before after analyzed, mechanism was discussed. Research shows that has better high low temperature performance mechanical than asphalt. After aging, asphaltene content increases, gum light components decrease. When unaged, more asphaltenes asphalt, change is less With progress rutting factor gradually phase angle decreases, high-temperature improved; modulus rate low-temperature capability weakened; cohesive energy density intermolecular interaction becomes stronger, solubility parameter smaller, which reduces compatibility between modifier increases elastic modulus, bulk improving Based rheological properties, composition changes, model parameters anti-ultraviolet ability