Abstract
In the Superpave™ binder specification system, long-term aging of bituminous binders is simulated by treatment for 20 h in a pressure aging vessel (PAV). In some North American jurisdictions, 20 h PAV aging has been supplemented with 40 h PAV as it has been suggested that more severe laboratory aging is necessary to screen some of the current blended binders. As extending already lengthy laboratory aging impacts refinery and terminal logistics, in this work, several alternate aging methods to shorten test time while providing equivalent extent of aging to 40 h PAV were evaluated. For this study two PG 64-22 binders (one straight-run, and one softened with a bio-oil) were aged through multiple cycles of the rolling thin-film oven test, 20 h PAV at three temperatures, or 40 h PAV. The properties of the aged binders were compared and initial results indicate that 20 h PAV aging at 110–120 °C mimics 40 h PAV aging at 100 °C, but that changing temperature can change the relative ranking of binders.
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