2020 Volume 76 Issue 2 Pages I_251-I_259
Recycling of asphalt pavement in Japan has been carried out for over 40 years, and recycled aggregate is considered to be recycled multiple times depending on the regions. In order to continue the permanent recycling of pavement toward the future, it is necessary to clarify the effect of the recycled aggregate ratio and the rejuvenators in consideration of repeated use. Therefore, in this study, recycled asphalt mixtures with two types of rejuvenator with different composition and recycled aggregate ratio with 4 levels were repeatedly aged and recycled, and their property changes and effects were examined by laboratory experiments. As for the composition of the additive for regeneration, attention was paid to saturated components and aromatic components. As a result, it was clarified that the properties of the new mixture remarkably changed depending on the composition of the rejuvenator and the mixing ratio of the recycled aggregate. In particular, it became clear that the crack resistance at high temperatures decreased, and the evaluation method was also examined.
