Abstract
In Japan, it has been passed more than 30 years since reclaimed asphalt pavement (RAP) was started to use as recycling material. More than the half of asphalt pavements in service may have been executed recycling in the past. If considering a maintenance cycle of asphalt pavements, RAP which has experienced recycling repetitively is concerned to increase in the future.
Authors evaluated the behavior of hot mix asphalt and asphalt binder after aging and recovering processes repetitively in a laboratory, using rejuvenator which is applied widely in Japan.
As a result, it is found that the physical properties of recovered asphalt binder, using rejuvenator, become lower gradually depending on recycling counts. From chemical analysis, such as bitumen components, oxidation and molecular weight distribution of recycled asphalt binder, it becomes clear that the oxides accumulated through the aging and recovering processes are affecting the property deterioration. The characteristic degradation of recycled asphalt binder was remarkable as the blending ratio of RAP is large.
