Based on surface energy theory, the sessile drop contact angle testing method was employed to measure the contact angles of five asphalt types (emulsified asphalt, water-activated asphalt, polyurethane asphalt, PG 76 modified asphalt, and 70# base asphalt) and four aggregates (granite, basalt, diabase and limestone) to quantitatively characterize the interfacial adhesion and water stability of constant temperature asphalt, hot mix asphalt, and aggregate systems. Surface energy parameters, cohesive work, adhesive work, and debonding work were calculated. The test results indicate that polyurethane asphalt exhibits the highest surface energy, while limestone aggregate shows the maximum surface energy. For the identical aggregate, the adhesive work of asphalt-aggregate combinations follows the order: polyurethane asphalt > water-activated asphalt > PG 76 modified asphalt > emulsified asphalt > 70# base asphalt, with the polyurethane asphalt-limestone combination demonstrating the highest adhesive work. The debonding work follows a basically consistent order, with polyurethane asphalt still yielding the best performance. SPSS significance analysis reveals that the asphalt type is the dominant factor influencing interfacial adhesive work. Further verification by the water stability indicator confirms that the polyurethane asphalt-limestone combination possesses the strongest resistance to water damage.
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