High temperature rheological properties of crumb rubber modified asphalt binders with various modifiers

This study aimed to analyze the rheological properties of the modified asphalt binders based on the effects of base binder type and other five polymers or acid combined with 7% dosage ground tire rubber (GTR) at the high temperature. The test results included viscosity, fail temperature, G∗/sin δ, phase angle, viscometry, amplitude sweep, frequency sweep, creep and creep recovery, and stress relaxation in this study. The results indicated that two of alternative polymers modified binders had noticeably lower viscosity values compared to SBS modified binders. Additionally, the addition of polyphosphoric acid could remarkably decrease the polymer dosage to produce PG76 binder. Meanwhile, asphalt source played a key role in determining the characteristics of all modified binders. The terminally and laboratory blended binders generally had approaching rheological properties in this study.