Investigation of the properties of asphalt mixtures incorporating reclaimed SBS modified asphalt pavement

• Recycling asphalt mixtures containing RAP, RA and control asphalt mixture were prepared.
• RAP increase the stiffness and decrease the anti crack performance of asphalt mixture.
• RA can restore and soften the binder in RAP and improve the fatigue of asphalt mixture.
• RA can improve the anti crack performance of asphalt mixture containing RAP.

With the increasing environmental considerations and rising costs of construction materials, reclaimed asphalt pavement (RAP) has been frequently added into asphalt paving mixtures during pavement construction. Many studies have been conducted with regard to the study of reclaimed unmodified asphalt pavement, but the reclaimed SBS modified asphalt pavement is still unknown. In this study, the effects of RAP and rejuvenating agent on the performance were studied. The moisture susceptibility, rutting resistance, dynamic modulus, low temperature anti cracking performance and fatigue was tested. Furthermore, in order to better understand the effects of RAP and rejuvenating agent, the control asphalt mixture was measured using the same methods. The results indicated that the asphalt mixture incorporating reclaimed SBS modified asphalt pavement with better moisture susceptibility, rutting resistance, dynamic modulus, low temperature anti cracking performance and fatigue resistance was obtained by blending new SBS modified asphalt binder and rejuvenating agent. Thus, the rejuvenating agent will benefit the effort of preparing more sustainable asphalt pavement containing RAP.