Reclaimed Asphalt Pavement in Circular Economy of Road Construction

Reclaimed Asphalt Pavement (RAP) has gained noteworthy attention in sustainable pavement engineering due to its potential to mitigate material waste, reduce carbon emissions, and increase pavement performance. This literature review synthesizes research findings on the mechanical performance, rejuvenation techniques, recycling technologies, and environmental effects of RAP-based asphalt mixtures. The review begins with an overview of the mechanical properties of RAP, emphasizing strength, durability, and binder aging. Various rejuvenation strategies, including bio-based and chemical additives, are discussed to restore aged binder properties. Recycling technologies such as hot mix, warm mix, and cold in-place recycling are explored, highlighting their effectiveness in maintaining road quality. Additionally, life cycle assessment (LCA) studies demonstrate the environmental advantages of RAP integration in pavement construction. The findings show that while RAP offers substantial sustainability benefits, limitations related to binder stiffness and cracking resistance require targeted interventions. Future research should focus on optimizing RAP blends and enhancing long-term performance through advanced modification strategies.