宏纳观多尺度集料-沥青粘附性评价

doi:10.11896/cldb.19120125

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Abstract The adhesion force between aggregate and asphalt binder is one of the important indicators of asphalt mixture performance, which has important effect on the durability of the road. The adhesion force between aggregate is influenced by many factors. In order to investigate the inf-luence of the inherent components of the aggregate on the adhesion force between aggregate and asphalt binder, the probe tip of the atomic force microscope (AFM) was modified: use the main compounds in aggregate to make small ball probe tips so as to measure the adhesion of the asphalt surface. Obtaining aggregates from the quarry attached to the road engineering project under construction, combined with X-ray fluorescence spectrometer (XRF) analysis and macro MTS pull-out test to investigate the effect of aggregate composition on aggregate-asphalt adhesion and conduct a comprehensive evaluation. The conclusion indicates that the adhesion between aggregate and asphalt binder includes physical adsorption and chemical adsorption. Large adhesion force occurs between Al₂O₃ and asphalt binder, the results measured at the nano level show that there is a strong intermolecular attraction between SiO₂ and asphalt binder, while the intermolecular attraction between CaCO₃ and asphalt binder is weak. The macro-level measurement results show that chemisorption has a stronger effect on the adhesion between aggregate and asphalt binder and the alkaline aggregate combined with asphalt binder have a stronger ability to resist water damage. The result has certain guiding significance of aggregate screening in road engineering.

Key words： asphalt AFM adhesion pull-out test

Published: 28 January 2021

CLC number:

U414

Fund:The National Natural Science Foundation of China (51678251).

About author:: Jiangmiao Yu, Ph.D. in engineering, professor and doctoral supervisor of School of Civil and Transportation, South China University of Technology, head of the Department of Road Engineering. National public visi-ting scholar at the University of California, Berkeley (UC Berkeley) Pavement Research Center. The key research directions are high-performance asphalt and asphalt mixtures, new pavement structures and materials, and modern road maintenance and management technologies.

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Cite this article:

YU Jiangmiao,ZHOU Wenli. Evaluation of Adhesion Between Aggregate and Asphalt Binder in Multi-scale[J]. Materials Reports, 2021, 35(2): 2052-2056.

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http://www.mater-rep.com/EN/10.11896/cldb.19120125 OR http://www.mater-rep.com/EN/Y2021/V35/I2/2052

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