Study On Asphalt Aging Effects To Adhesion Of Interface Between Asphalt And Aggregate

Asphalt-aggregate interface adhesion is one of the factors that lead to asphalt pavement disease.It is far-reaching significance to study the effect of aging on asphalt-aggregate interface adhesion.The effect of aging on the indicators of asphalt,while affecting the asphalt-aggregate interface adhesion.Many researchers use a variety of means to study the asphalt-aggregate interface adhesion.However,there are few studies on the interfacial adhesion of asphalt aging.On the basis of the aging of asphalt,the asphalt-aggregate interface model and the asphalt-mixture interface model test are few.The asphalt was subjected to different degree of aging and two different litholgic aggregates were prepared and the asphalt-aggregate interf-ace model was made.The model was subjected to drawing and shearing test under different temperature conditions.The interface between the actual road surface and the multi-layer interface is simulated.Making the asphalt-mixture interface model,the drawing,shear comparison test.The curves of asphalt aging and asphalt-aggregate interface were fitted with multi-curve model,and the curves and relations were obtained by comparison and analysis.Construction of univariate asphalt-aggregate interface adhesion relationship with interface intensity as variable.The relationship between the two kinds of interface model was analyzed.After adding the factors such as acidity,water,surface texture and so on,the relationship between the multivariate asphalt-aggregate interface was established.According to the molecular orientation theory,polar molecules and aggregate surface to form adsorption layer,making the asphalt-aggregate interface adhesion increased.The asphaltene content in the asphalt was increased under the aging of the asphalt.Asphaltene contains a large number of polar molecules,enhanced asphalt-aggregate interface adhesion.Rationality Analysis of the Relationship between Aging Behavior and Asphalt-Aggregate Interface Adhesion.The results show that the adhesion of asphalt-aggregate interface increases with the aging of asphalt.Short-term aging process,asphalt-aggregate interface increased adhesion faster.As the aging time increases,the asphalt-aggregate interface increases the rate of increase in adhesion.Under long-term aging,the asphalt-mixture interface is strongly stabilized.