Tarrahan Parseh Transportation Research Institute International Journal of Transportation Engineering 2322-259X 13 4 2026 04 01 Effects of Aging and Rest Periods on the Self-Healing Properties of Asphalt Mixtures 2373 2385 236025 10.22119/ijte.2025.553085.1713 EN Masoud Jilanchi Faculty of Engineering and Technology, University of Zabol, Iran Mahmood Reza Keymanesh Faculty Member, School of Engineering, Payame Noor University, Iran Alireza Khavandi Faculty Member, School of Engineering, University of Zanjan, Iran Journal Article 2025 10 13 <span>Aging of asphalt mixtures is one of the main causes of reduced durability and performance in flexible pavements. The self-healing ability of asphalt materials plays an important role in extending their service life. This study examines the impact of short-term and long-term aging, using two standard methods (R30 and NCHRP), as well as the influence of different rest periods on the self-healing capacity of asphalt mixtures. Specimens were prepared with PG 64-16 binder and siliceous aggregates, and self-healing was assessed using three indicators: stiffness ratio difference, fatigue life ratio, and failure rate. The results show that longer rest periods significantly improve self-healing indices. Samples aged with the R30 method generally performed better than those aged with the NCHRP method, while unaged samples consistently exhibited the highest self-healing potential. The findings suggest that employing multiple indices provides a more complete picture of asphalt mixture behavior, and systematic comparison of aging methods can serve as a valuable guide for optimizing materials and designing long life pavements.</span> http://www.ijte.ir/article_236025_31601f242ccbf3ae5e81329457384183.pdf