Abstract
AbstractIn this study, the rheological properties and activation energy (AE) of unaged and aged asphalts blended with different percentages of binder, recovered from three reclaimed asphalt pavement (RAP) sources, were investigated. Superpave asphalt binder tests were used to evaluate the effects of the recovered asphalt binder source and content. The results indicated that the addition of recovered binder from each source increased the viscosity, G*/sinδ, and G*sinδ. The increase in viscosity per 1% recovered binder was evaluated using non-dimensional viscosity index (∇ηRAP). In addition, the increase in G*/sinδ and G*sinδ per 1% recovered binder were investigated using relative Superpave rutting gradient (RSRG) and relative G*sinδ gradient (RG) factors, respectively. The results indicated that the ∇ηRAP, RSRG, and RG depended on recovered binder source, content, aging, and test temperature. The interpretation of the AE results depended on the physical phase of the asphalt blends, irrespective of the rec...
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