A comprehensive state-of-art review on the use of rejuvenators in asphalt pavement

The utilization of reclaimed asphalt pavement (RAP) in asphalt mixtures has gained momentum in recent years, yet concerns persist regarding the long-term performance and binder properties of high RAP content mixtures. To overcome these challenges, rejuvenators have emerged as a promising solution to enhance the properties of aged asphalt binders and improve the overall performance of asphalt mixtures. This paper provides a comprehensive state-of-the-art review of rejuvenator technology and its potential to enhance the performance and sustainability of asphalt pavements. Rejuvenators are additives used to restore the properties of aged asphalt binders, particularly when incorporating high percentages of RAP. The performance of these additives varies based on their origin, and different methods can be used to analyze the rejuvenation process. Since proper specifications for rejuvenators are not available, blending charts are used to determine the optimum dosage of rejuvenators. However, proper blending must be achieved to maximize results and reduce the effect of black rock. Laboratory tests and some field performance studies on rejuvenated aged asphalt binders and RAP mixtures have shown improved or similar performance compared to virgin materials. Additionally, the use of rejuvenators has been observed to reduce construction costs, suggesting that this is a cost-effective technology for asphalt pavements. While rejuvenators show promise in improving the performance of pavements with recycled materials, challenges remain regarding optimization, long-term durability, and environmental effects. This review paper also identifies key areas for future research, including life-cycle cost analyses, comprehensive environmental impact assessments, and long-term field performance monitoring.