The use of rejuvenating agents in production of recycled hot mix asphalt: A systematic review

•Application of rejuvenating agents in production of HMA is reviewed.•Recycling high amount of RAP is possible using rejuvenating agent.•Importance of selecting rejuvenator type and dosage is highlighted.•Rejuvenators must satisfy both short-term and long-term criteria.

Extensive researches have been conducted on using reclaimed asphalt pavement (RAP) material in production of recycled hot mix asphalt. According to literature, the aged binder is the main obstacle to incorporate high amount of RAP into asphalt pavement which causes premature distresses such as fatigue failure and low temperature cracking in pavement structure. To overcome this problem, rejuvenating agent or rejuvenator is usually used to restore the RAP binder properties to a condition that resembles that of fresh asphalt binder. Different types of rejuvenators have been used previously. This study provides an overview on utilizing RAP, and the use of rejuvenators, type and dosage, in production of asphalt pavement.