Laboratory Investigation of Recycling for Aged SBS Modified Asphalt Cement

摘要

This research focused on the recycling of aged SBS modified asphalt cement. The physical properties and rheological properties of aged SBS modified asphalt cement were evaluated based on force-ductility test and SHRP binder tests. Based on the aging characterization of SBS modified asphalt cement, the recycling properties of aged SBS modified asphalt cement, by utilizing a recycling agent in common use for unmodified asphalt binder rejuvenation and a new modifying additive for asphalt mixture performance modification, were evaluated based on SHRP tests. The results showed that aging caused efficacity lose of SBS modifier in the SBS modified asphalt cement and finally led to harden and brittle asphalt cement. However, the recycling agent in common use currently doesn't completely apply to the aged SBS modified asphalt cement recycling. The rejuvenation of aged SBS modified asphalt cement requires new modifying additive. The recycling agent together with new modifying additive were proved to be able to restore and improve the desired road performance and durability of aged SBS-modified asphalt cement.