Journal Published Online: 27 October 2015
Volume 44, Issue 2

Numerical Simulation of Motion Rules of Coarse Aggregates in the Compaction Process



Three-dimensional digital aggregate particles with irregular shapes were fabricated by truncating spheres with the randomly created cutting planes using the particle flow code in three-dimensions (PFC3D) to investigate their rules of motion during the compaction process. The digital specimen of aggregate mixture with the same gradation and shape characteristics of real aggregates was developed. Specimen were compacted with static pressure in PFC3D. The axial stress on particles, average motion displacement range (AMDR), and translational velocity of each particle were analyzed in the compaction process under different displacements. The results indicate that both axial stress and mean contact-force on particles increases with compacting displacements. Aggregates located at different specimen heights show great differences in AMDR on vertical and horizontal orientation. At the same height of specimen, the AMDR on vertical orientation is greater than that of horizontal orientation and has a positive correlation with compacting displacement. However, the AMDR on horizontal orientation has a poor correlation with compacting displacement. Translational velocity of particle does not show an obvious relationship with the compacting displacement and the height of specimen. This study presented some cues for a further understanding of the compaction mechanism of asphalt mixture.

Author Information

Gao, Ying
School of Transportation, Southeast Univ., Nanjing, CN
Liu, Weidong
School of Transportation, Southeast Univ., Nanjing, CN
Li, Hanguang
Xuzhou Highway Construction Management Bureau, Jiangsu, CN
Dai, Xiongwei
School of Transportation, Southeast Univ., Nanjing, CN
Pages: 8
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Stock #: JTE20150228
ISSN: 0090-3973
DOI: 10.1520/JTE20150228