The reclaimed asphalt pavement (RAP) mixtures have shown good resistance to rutting for hot-mix asphalt pavement (HMA). Mixtures using polymer modified binders with styrene-butadiene-styrene (SBS) have also shown good performance in terms of rutting and cracking. This paper presents the laboratory evaluations in order to determine the rutting and cracking performanceof the RAP mixtures with SBS polymer modified binders as virgin binders. The asphalt pavement analyzer (APA) test and indirect tensile (IDT) test were used for the laboratory evaluation. In addition, the properties of SBSpolymer modified binders blended with recovered RAP binders were also investigated. The binder tests included G*/sind and G*sind, which respectively, are rutting and cracking parameters of the Superpave PG grade system, were performed. The multiple stress creep and recovery (MSCR) test, which has recently received attention as an indicator of the rutting potential ofpolymer modified asphalt binder, was also performed. RAP mixtures with SBS polymer modified binders were fabricated containing different amounts ofRAP materials: 0%, 15%, 25%, and 35%. From the APA and Superpave IDT tests, RAP mixtures with modified binders showed good performance regardless of amounts of RAP materials in HMA. Even though the parameters, G*/sind, G*sind, and the percent recovery indicated the different amounts of RAP binders in polymer modified binders, the relationship between these parametersand mixture performance was not clearly identified.
Abstract