It is found that the aging effect has little effect on the aliphatic chain, but the aging effect increases the molecular weight of asphalt.
studied the changes of functional groups and molecular weight of asphalt before and after aging by liquid chromatography. When moisture enters the interface between asphalt and aggregate, the interfacial adhesion work decreases, and the decline of aging asphalt is more obvious than that of matrix asphalt. It is believed that aging weakened the aggregation effect of asphalt. Yi used molecular dynamics simulation to study the effect of asphalt aging on the adhesion work of asphalt-aggregate interface. It is found that the adhesion results obtained by the two methods are consistent. The adhesion of asphalt at different aging degrees was obtained by AFM test and molecular dynamics simulation. established a molecular interface model of asphalt samples and AFM siliceous needle tips. The results show that the aging component in asphalt helps to reduce the damage of water to asphalt mixture. studied the effect of asphalt aging on the water damage resistance of asphalt mixture by molecular dynamics simulation. The oxidation functional groups’ viscosity of asphalt increases after aging, which leads to the increase of asphalt viscosity, indicating that the hardness of asphalt increases. Pan and Tarefder studied the effects of asphalt chemical composition and molecular structure on macroscopic rheological properties and mechanical properties after aging by molecular dynamics.
It is found that aging would reduce the nanoaggregation behavior of asphaltene molecules, reduce the migration rate, and reduce the asphalt and aggregate interface bonding effect. applied molecular dynamics simulation to study the effect of thermal oxygen aging on asphalt and the water damage of asphalt mixture. The results show that the effect of rejuvenator on long-term aging asphalt is obvious, and the effect on short-term aging asphalt is limited. calculated the interaction between asphalt mixture and rejuvenator by molecular dynamics. established a three-component model of asphalt through molecular simulation to study the aggregation state of asphalt molecules, but a simple three-component model is difficult to establish a relationship with the macroperformance, which can only be used as a simple analysis. The molecular dynamics simulation method is introduced into the field of asphalt research to provide a new scale and method for the research of asphalt materials. For asphalt materials, exploring the relationship between the properties at different scales can further obtain the mechanism of the formation and change of macroperformance, which can provide a theoretical basis and feasible ways for further improving the macroperformance of asphalt. There is a certain relationship between the properties of the same material observed at different scales. The reasons and mechanisms for the influence of microstructure on aging are obtained by analyzing this relationship. By analyzing the changes of asphalt properties before and after aging at two scales, it can be found that there is a certain relationship between the properties obtained at different scales. The results show that the molecular dynamic energy of the CR after aging increases the asphaltene-asphaltene RDF is decreased after aging and the AFM surface microstructure images of asphalt before and after aging do not change significantly, but quantitative analysis by roughness theory shows that aging makes the microscopic surface of the CR more uniform and gentle. The molecular dynamics energy, radial distribution function (RDF), surface microstructure image, roughness, and other test results of the CR before and after aging were compared and analyzed.
Function Breadcrumb(props) is what displays the name of the crumb onto the screen.Ĭonst = useState() - This uses the useState React hook in order to just store an array of strings into the variable called crumbs.In order to explore the variation of crumb rubber modified asphalt (CR) before and after aging at the micro- and nanoscales, the molecular dynamics simulation and atomic force microscopy (AFM) asphalt microstructure scanning were carried out on CR before and after aging.
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