RESEARCH ON THE ULTRAVIOLET RAYS DETERIORATION OF THE HIGH VISCOSITY MODIFIED BITUMEN

Aggregate pop-out is one of the major damages of porous asphalt pavement. As for the causes of pop-out damage, initial performance of modified binders such as shear strength and brittleness at low temperature must be an important factor, but the author focus on the deterioration of modified binders due to ultra-violet rays (UV) in this study. The results of Cantabro-loss after UV irradiation showed that accelerated UV aging induced the aggregate pop-out damage of porous asphalt mixtures. Binder properties after UV irradiation also showed the increase of Fraas Breaking Point and oxygen containing functional group. Furthermore, it was confirmed that there is a good correlation between the increase of oxygen containing functional group and Fraas Breaking Point.