Research on the Adhesion Performance of Mastic Powder Modified Asphalt and Aggregate Interface based on Molecular Dynamics
The interfacial adhesion between rubber powder modified asphalt and aggregate has an important influence on the durability and high temperature stability of asphalt pavement.Based on the molecular dynamics simulation,an interface model consisting of matrix asphalt,natural rubber asphalt,parabellum asphalt,butadiene rubber asphalt(15％admixture)and four mineral components(quartz,calcite,sodium feldspar,microplagioclase feldspar)in two,is established to explore the influence law of their interfacial adhesion from the molecular scale.The results show that the characteristics of the aggregates themselves are the key to their adhesion with asphalt at room temperature,and generally alkaline aggregates are better than acidic aggregates;the improvement of the adhesion strength between asphalt and minerals by three kinds of modified asphalt with the same 15％admixture is ranked as follows:cis-butyl rubber＞SBR＞natural rubber;15％cis-butyl rubber can significantly improve the adhesion strength of microplagioclase feldspar with asphalt,and 15％SBR can significantly improve the adhesion strength between calcite and asphalt;if the content of sodium feldspar in the aggregate is high,the adhesion can be improved by appropriately increasing the amount of asphalt.The molecular dynamics technique can be used to investigate the interfacial mechanism between the rubber powder asphalt and the aggregate in more depth,so as to propose targeted methods to improve the adhesion between the rubber asphalt and the aggregate,and provide reference for practical engineering applications.
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