Effect of Asphalt Rejuvenating Agent on Rutting Properties of Aged Reclaimed Asphalt Pavement

Hot-in-place recycling (HIR) is an in-situ process that preserves asphalt pavements while minimizing use of virgin binder and aggregates. HIR mixture requires asphalt binder modification, which is commonly achieved by adding an asphalt rejuvenating agent (ARA) to the mixture. However, ARA potentially adversely affects rutting resistance of the final surface. The objective of this research was to investigate the effects of rejuvenation on HIR permanent deformation by conducting Hamburg wheel-tracking device and dynamic modulus tests. The samples were collected from three different HIR projects in KS and the test results showed that although the addition of ARA has a slight softening effect on HIR mixture performance, HIR mixtures with ARA could certainly meet the Kansas Department of Transportation permanent deformation requirement.