Evaluating the Rheological, Chemical and Morphological Properties of SBS Modified Asphalt-Binder under Multiple Aging and Rejuvenation Cycles

To investigate the influence of multiple cycles aging and rejuvenation on rheological, chemical, morphological properties styrene–butadiene–styrene (SBS)-modified asphalt-binders, asphalt-binders were aged using two laboratory simulation methods, namely a rolling thin film oven (RTFO) test for short-term pressure vessel (PAV) long-term aging. The then rejuvenated with three types rejuvenators (Type I, II, III) different dosages (i.e., 6%, 10%, 14% first, second, third rejuvenation, respectively). A dynamic shear rheometer (DSR) was used to analyze effect rheological all asphalt-binders. changes in functional groups microscopic morphology process studied Fourier transform infrared (FTIR) atomic force microscopy (AFM). results indicated that could soften stiffness restore microstructures repeated from DSR AFM testing. Considering rutting fatigue properties, Type I rejuvenator exhibited potential achieve desired effects under cycles. During cycles, resistance SBSMA decreased gradually FTIR results. This inherently limited number research is conducive promoting application penetrating rejuvenation.