期刊
CONSTRUCTION AND BUILDING MATERIALS
卷 267, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2020.120998
关键词
Virgin and aging asphalt; Atomic force microscopy (AFM); Bee structure; High and low temperature performance; Microstructure analysis
资金
- province key laboratory of road in Northeast Forestry University
- foundations for the project of National Natural Science Foundation of China [E080703]
- project of Heilongjiang Traffic and Transportation Department
The study investigated the microstructure of six asphalt samples using an atomic force microscope, showing that with aging time, the high temperature performance of asphalt improves while the low-temperature performance deteriorates.
In order to study how the microstructure of asphalt affects its macroscopic performance (high and low temperature performance), this study used 6 asphalt samples, including virgin asphalt (70# and 90#) and aging asphalt (aging temperature 163 degrees C, aging time 0 h, 35 h, 75 h, respectively). The microstructure of 6 kinds of asphalt samples was tested by atomic force microscope. The asphaltene content, four-component modulus and adhesion force in bee structure were analyzed, and then the degree of association of four components in different aging asphalt AFM diagrams was analyzed to study the effect of asphalt microstructure on its high and low temperature performance. On this basis, the dynamic shear rheometer and bending rheometer were used to test the high and low temperature performance of six kinds of asphalt samples, and the correctness of the effect of AFM based asphalt microstructure on their macroscopic performance was demonstrated. The results show that the high molecular weight represented by asphaltenes in asphalt increases with the aging time, the asphalt hardens, and the degree of association of four components in a single group increases, so the high temperature performance becomes better. At the same time, with the increase of aging time, the small molecular weight represented by the aromatic component in the asphalt decreases, the adhesion between the four components decreases, and the asphalt becomes brittle, so the low-temperature performance becomes poor. The research results have certain theoretical and practical value for further clarifying the microstructure characteristics of asphalt for high and low temperature performance. (C) 2020 Elsevier Ltd. All rights reserved.
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