[1] Liu Weidong, Gao Ying,. Discrete element modeling of migration and evolution rulesof coarse aggregates in the static compaction process [J]. Journal of Southeast University (English Edition), 2016, 32 (1): 85-92. [doi:10.3969/j.issn.1003-7985.2016.01.015]

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Discrete element modeling of migration and evolution rulesof coarse aggregates in the static compaction process()

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Journal of Southeast University (English Edition)[ISSN:1003-7985/CN:32-1325/N]

Volumn:

32

Issue:

2016 1

Page:

85-92

Research Field:

Civil Engineering

Publishing date:

2016-03-20

Info

Title:

Discrete element modeling of migration and evolution rulesof coarse aggregates in the static compaction process

Author(s):

Liu Weidong;  Gao Ying

School of Transportation, Southeast University, Nanjing 210096, China

Keywords:

asphalt mixture;  coarse aggregate;  static compaction;  discrete element model

PACS:

TU414

DOI:

10.3969/j.issn.1003-7985.2016.01.015

Abstract:

To investigate migration and evolution rules of coarse aggregates in the static compaction process, an algorithm of generating digital coarse aggregates that can reflect real morphology(such as shape, size and fracture surface)of aggregate particles, is represented by polyhedral particles based on the discrete element method(DEM). A digital specimen comprised of aggregates and air voids is developed. In addition, a static compaction model consisting of a digital specimen and three plates is constructed and a series of evaluation indices such as mean contact force σ_MCF, wall stress in direction of z-coordinate σ_WSZZ, porosity and coordination numbers are presented to investigate the motion rules of coarse aggregates at different compaction displacements of 7.5, 15 and 30 mm. The three-dimensional static compaction model is also verified with laboratory measurements. The results indicate that the compaction displacements are positively related to σ_MCF and σ_WSZZ, which increase gradually with the increase in iterative steps. When the compaction proceeds, the digital specimen porosity decreases, but the coordination number increases. The variation ranges of these four indices are different at different compaction displacements. This study provides a method to analyze the compaction mechanism of particle materials such as asphalt mixture and graded broken stone.

References:

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Memo

Memo:

Biographies: Liu Weidong(1985—), male, graduate; Gao Ying(corresponding author), female, doctor, associate professor, gy@seu.edu.cn.
Foundation item: The National Natural Science Foundation of China(No.51108081).
Citation: Liu Weidong, Gao Ying. Discrete element modeling of migration and evolution rules of coarse aggregates in the static compaction process[J].Journal of Southeast University(English Edition), 2016, 32(1):85-92. DOI:10.3969/j.issn.1003-7985.2016.01.015.

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