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Evaluation of Asphalt-Aggregate Adhesion Using Surface Free Energy Theory

In order to take a precise and objective evaluation on asphalt-aggregate adhesion, this paper analyzed the function at asphalt-aggregate interface using surface free energy theory. Two asphalts and two aggregates were selected and their surface free energy parameters, , and , were measured by the Wilhelmy plate method and the column wicking technique, respectively. Then, the resistance to moisture damage of asphalt mixture was predicted using calculated asphalt-aggregate adhesive bond energy and asphalt cohesive bond energy. The results show that moisture damage is a thermodynamically favorable phenomenon. Asphalt with a great acid-base polar component and a low Lifshitz-van der Waals apolar component always exhibits perfect cohesion.