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This paper presents the results of a study that was conducted to understand the impacts of aging and rejuvenation on fundamental properties of asphalt binders. A Performance Grade (PG) 64-22 binder was aged to simulate the aging of asphalt mixes during construction and in-service conditions. The binders’ surface tension property, i.e., contact angles between binder and three probe liquids, was measured using a sessile drop device. This property was then used to estimate surface free energy components of the control binder, aged binders, and rejuvenated binders using the Good–van Oss–Chaudhury postulation. Cohesive and adhesive bond energies of asphalt–aggregate systems under dry and wet conditions were also analyzed. The aggregates considered in this study were limestone and granite; these aggregates have different moisture affinities. The data showed that as asphalt ages, the contact angle …