Determining optimum rejuvenator dose for asphalt recycling based on Superpave performance grade specifications

The changes in Superpave performance grade (PG) of Reclaimed Asphalt Pavement (RAP) binder were determined after addition of two doses of six rejuvenators. The high and low PG temperatures were reduced linearly with an increased dose while the penetration grew exponentially. It was found that the grade sum of rejuvenated RAP binder is always higher than that of the corresponding virgin binder. Based on these conclusions a procedure for optimizing the rejuvenator dose to satisfy the Superpave PG requirements was developed to account for the inevitable variability of the RAP binder due to differences in aging and source.