Analysis on Property Changes of Neat and Modified Asphalt under Ultraviolet Aging

摘要

This paper discusses the changing of aged asphalt's properties with several neat and modified asphalt binders, and their mixtures performance. Results of Penetration, softening points, ductility test indicated that thermal-oxidation and ultraviolet radiation aging are two different aging behaviors to binders, regardless modified or not. Changes of physical and rheologcial properties after ultraviolet aging not consist with those after thermal aging, Dynamic Shearing Rheometer (DSR) and Bending Beam Rheomter (BBR) test indices showed that visco-elastic properties of both unmodified and modified binder evidently changed after ultraviolet aging, low temperature performance fallen thusly. Low-temperature bending and indirect tensile tests results revealed that asphalt mixture moisture stability and thermal cracking resistances turn to poor due to ultraviolet aging, and validated the different influences between thermal and ultraviolet aging on performances of binder and asphalt mixture.