ABSTRACT This work evaluated the road performance of recycled styrene-butadiene-styrene (SBS)-modified asphalt (SBSMA) mixtures incorporating a novel rejuvenator (RA) and fresh SBSMA. The RA was designed to restore aged binders by combining furfural extract oil, turpentine, C9 petroleum resin, and epoxidized soybean oil, and a small amount of fresh SBSMA was used to supplement the SBS modifier to some extent. Mixtures with 0 %, 25 %, 35 %, and 45 % reclaimed asphalt pavement (RAP) content were assessed by volumetric properties, high/low-temperature stability, water stability, fatigue life, and dynamic modulus. Results indicate that although properties such as dynamic stability and failure strain slightly declined with increasing RAP content, all recycled mixtures met the required specifications for high- and low-temperature performance and water resistance. Furthermore, using 25 % RAP achieved a cost saving of 19.4 % with negligible performance loss. The novel RA, combined with fresh SBSMA, effectively enables the production of sustainable pavement materials with high RAP content, with the 25 % RAP mixture identified as the optimal choice balancing performance and economy.
Zhu et al. (Tue,) studied this question.