Study on the interfacial adhesion between high viscosity asphalt and aggregate based on macro-micro tests and molecular simulation
In this paper,the macroscopic interface pull-out test,optimized water boiling test,and microscopic sessile drop test were combined to study the interfacial adhesion between high viscosity asphalt and diabase or limestone aggregate.High viscosity asphalt samples with varying high viscosity modifier contents(10～15%)and different aging degrees were prepared and their correlations between macroscopic and microscopic test results were compared.The results indicate that the adhesion between high viscosity asphalt and diabase aggregate is slightly better than that of limestone aggregate.With increased high viscosity modifier content,the interfacial pull-out bonding strength increases while the boiling peeling rate decreases.After aging,the interfacial pull-out bonding strength decreases and the boiling peeling rate increases.The pull-out bonding strength significantly increases with decreasing test temperature.The increase of the high viscosity modifier content has a greater effect on improving the interfacial adhesion work than on inhibiting the interfacial peeling work.The aging of the high viscosity asphalt has a greater effect on reducing the interfacial adhesion work than on enhancing the interfacial peeling work.There is a good linear correlation between the macro and micro indicators that characterize the interfacial adhesion.Through molecular dynamics simulation,further analysis was conducted on the interaction energy between high viscosity asphalt and aggregate components in both aqueous and anhydrous environments,so as to characterize the interfacial adhesion state.
macro and micro testshigh viscosity asphaltaggregateinterfacial adhesion
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万方数据
