Aging Characteristics of Asphalt in Different Structural Layers of In-service Pavement
In order to analyze the comprehensive aging process and mechanism of asphalt pavement during use,three types of pavement structures of representative in-service road surfaces,namely bridge deck pavement,ordinary road sections,and ramps,were selected,and core samples were drilled separately.The different performance indicators of asphalt extracted from core samples were studied by gel permeation chromatography(GPC)analysis and Fourier transform infrared spectroscopy(FTIR)analysis.The aging degree of asphalt in different structural layers was analyzed and the impact of different pavement structural layers on asphalt aging was clarified.The results show that among the various structural layers of asphalt pavement,the upper layer of asphalt has the most severe aging degree,while the lower layer of asphalt has the weakest aging degree.Asphalt aging is mainly caused by oxidation,and the aging process follows the rule of asphalt macromolecular chain breaking into small molecules,increasing small molecule content,and increasing molecular weight width.After aging,the asphalt components will undergo changes,which in turn will affect the overall performance of pavement structure.
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