Analysis of Segregation Tendency of Aggregates Based on Composite Geometric Characteristics
Publication: Journal of Materials in Civil Engineering
Volume 34, Issue 1
Abstract
Aggregate segregation is an important factor affecting the early distress and durability of asphalt pavement. To analyze the segregation tendency of aggregates on the mesoscopic scale, first, the segregation tendency of the particle system was measured using an aggregate segregation machine and compared with that of an aggregate-asphalt system. Then composite geometric indexes were calculated and a contact-slip test conducted. The effect of composite geometric characteristics of coarse aggregates on the contact and friction properties of particles was analyzed. Finally, the relations of the segregation index and mesoscopic parameters, including composite geometric indexes and contact-friction indexes, were respectively discussed. The results show that the composite angularity index exhibits a good linear correlation with the segregation index. A larger composite angularity index and composite texture index imply a stronger contact-friction strength of the particle system, which leads to the segregation of coarse aggregates. Fine aggregates move through voids among the coarse aggregates during the falling process. A larger composite shape index indicates more air voids among coarse aggregates, and fine aggregates easily move through voids at higher speed. The bonding/lubrication properties of asphalt can effectively reduce the segregation degree of aggregates.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
Acknowledgments
The authors sincerely express their gratitude to the Key Laboratory of Road Structure & Material Ministry of Transport, PRC for providing test instruments. We gratefully acknowledge the financial support from the National Natural Science Foundation of China (Grant No. 51878061), Applied Basic Research Project, Ministry of Transport of China (Grant No. 2014319812151), Natural Science Basic Research Plan in Shaanxi Province of China (Grant No. 2019JM195), and the Fundamental Research Funds for the Central Universities (Grant No. 300102210703).
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Published In
Journal of Materials in Civil Engineering
Volume 34 • Issue 1 • January 2022
Copyright
© 2021 American Society of Civil Engineers.
History
Received: Dec 21, 2020
Accepted: May 20, 2021
Published online: Oct 26, 2021
Published in print: Jan 1, 2022
Discussion open until: Mar 26, 2022
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Cited by
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