Accurately Tracking Migration of Particles Based on Discrete-Element Simulation during Compaction Process
Publication: Journal of Materials in Civil Engineering
Volume 36, Issue 4
Abstract
Aggregate particles migrate and rearrange their spatial positions during the compaction process. To analyze the migration law, an accurate method to track migration of particles is proposed using discrete-element simulation and experimental verification. First, the coarse aggregates were generated based on realistic aggregate shapes using a three-dimensional (3D) Blu-Ray scanner. Subsequently, the fine aggregates, ranging from 0.075 to 2.36 mm, and asphalt mastic were replaced with balls with a radius of 0.7 mm. Then the three-dimensional dynamic compaction models of asphalt mixture were established using the Superpave gyratory compaction method and Marshall impact compaction method. Next, the migration tracking test of particles was developed adopting particle marking, step-by-step compaction, and CT scanning. Finally, the accuracy and efficiency of the virtual models were validated using the experimental data from the migration tracking test. The results indicate that the established compaction models can accurately track the aggregates particles and measure the migration indexes. The compaction methods have a great influence on the migration behavior. The displacement of the particles for the Superpave gyratory compaction method is greater than that for the Marshall method, and the displacement is multidirectional, whereas the displacement of particles for the Marshall impact compaction method mainly are vertical.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published paper.
Acknowledgments
The authors sincerely express their gratitude to the Key Laboratory of Road Structure & Material Ministry of Transport, PRC, for providing test instruments. The authors gratefully acknowledge the financial support from the National Natural Science Foundation of China (Grant No. 52278426), the Applied Basic Research Project of the Ministry of Transport of China (Grant No. 2014319812151), the Natural Science Basic Research Plan in Shaanxi Province of China (Grant No. 2019JM195), the Natural Science Basic Research Plan in Shandong Province (Grant No. ZR202211280381), and the Fundamental Research Funds for the Central Universities (Grant Nos. 300102213530 and 300102212206).
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Published In
Journal of Materials in Civil Engineering
Volume 36 • Issue 4 • April 2024
Copyright
© 2024 American Society of Civil Engineers.
History
Received: Apr 1, 2023
Accepted: Sep 14, 2023
Published online: Jan 24, 2024
Published in print: Apr 1, 2024
Discussion open until: Jun 24, 2024
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