Evaluation of coarse aggregate movement and contact unbalanced force during asphalt mixture compaction process based on discrete element method

Zhu, Xuan; Qian, Guoping; Yu, Huanan; Ding, Yao; Shi, Changyun; Zhang, Chao

doi:10.1016/j.conbuildmat.2022.127004

Cited by 47 publications

(13 citation statements)

References 35 publications

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“…The parameters such as aggregate contact point, average contact length, total contact length, and contact orientation can be obtained from a section image of the asphalt mixture. The contact chain network in an asphalt mixture is a complex topological structure, which changes with the change of external load action [ 30 , 62 , 63 , 64 , 65 ].…”

Section: Characterization Of Load Transfer Mechanismmentioning

confidence: 99%

“…Some researchers also used various statistical parameters to characterize the features of contact forces. Zhu et al [ 62 ] defined the vertical contact unbalanced force, which is calculated as the sum of the contact force vectors and the gravity of aggregate. It was found that the larger the particle size, the more the contact number, the greater the contact unbalance force in the Marshall impaction process.…”

Section: Characterization Of Load Transfer Mechanismmentioning

confidence: 99%

“…The contact number during double-sided compaction is more uniform than it is under single-sided compaction. In order to assess the variance in load transfer during the Marshall impact compaction process of asphalt mixes, Zhu et al [ 62 ] employed the vertical contact unbalanced force. Using DEM modeling, it was possible to measure the vertical contact imbalanced force and the contact number for compaction numbers of 2, 4, 6, 8, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 70, 80, 90, and 100 [ 62 ].…”

Section: Load Transfer Mechanism Of Asphalt Mixture Under Different L...mentioning

confidence: 99%

“…In order to assess the variance in load transfer during the Marshall impact compaction process of asphalt mixes, Zhu et al [ 62 ] employed the vertical contact unbalanced force. Using DEM modeling, it was possible to measure the vertical contact imbalanced force and the contact number for compaction numbers of 2, 4, 6, 8, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 70, 80, 90, and 100 [ 62 ]. It was discovered that when the number of strikes increased, the imbalanced force of each particle size progressively reduced.…”

Section: Load Transfer Mechanism Of Asphalt Mixture Under Different L...mentioning

confidence: 99%

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Review on Load Transfer Mechanisms of Asphalt Mixture Meso-Structure

Wang

Miao

et al. 2023

Materials

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Asphalt mixture is a skeleton filling system consisting of aggregate and asphalt binder. Its performance is directly affected by the internal load transfer mechanism of the skeleton filling system. It is significant to understand the load transfer mechanisms for asphalt mixture design and performance evaluation. The objective of this paper is to review the research progress of the asphalt mixture load transfer mechanism. Firstly, this paper summarizes the test methods used to investigate the load transfer mechanism of asphalt mixtures. Then, an overview of the characterization of load transfer mechanism from three aspects was provided. Next, the indicators capturing contact characteristics, contact force characteristics, and force chain characteristics were compared. Finally, the load transfer mechanism of asphalt mixtures under different loading conditions was discussed. Some recommendations and conclusions in terms of load transfer mechanism characterization and evaluation were given. The related work can provide valuable references for the study of the load transfer mechanism of asphalt mixtures.

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Section: Characterization Of Load Transfer Mechanismmentioning

confidence: 99%

Section: Characterization Of Load Transfer Mechanismmentioning

confidence: 99%

Section: Load Transfer Mechanism Of Asphalt Mixture Under Different L...mentioning

confidence: 99%

Section: Load Transfer Mechanism Of Asphalt Mixture Under Different L...mentioning

confidence: 99%

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Review on Load Transfer Mechanisms of Asphalt Mixture Meso-Structure

Wang

Miao

et al. 2023

Materials

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“…The result showed that the particles sizes affect the unbalanced force distribution of the coarse aggregate, and with increasing blows, the coarse aggregate’s imbalance force reduced, indicating that compaction has a tendency to make the asphalt mixture more stable. The macroscopic and microscopic behavior of the GBM was evaluated by Li et al under repeated load triaxial testing with the discrete-element method [ 22 ]. The findings demonstrated good agreement between the resilient modulus determined by the developed simulation and that determined by laboratory measurements.…”

Section: Introductionmentioning

confidence: 99%

Effect of Sleeper-Ballast Particle Contact on Lateral Resistance of Concrete Sleepers in Ballasted Railway Tracks

et al. 2022

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Although a sleeper makes a great contribution to the lateral resistance of ballasted tracks, in this regard, limited studies have been carried out on the effect of its contact surface with ballast aggregates. The current paper is dedicated to evaluating the effect of sleeper shape on the lateral resistance of ballasted track through discrete element modelling (DEM). For this purpose, firstly, a DEM model was validated based on the experimental results. Then, a sensitivity analysis was undertaken on the effect of the different contact areas that a standard concrete sleeper faces with the crib, shoulder and underlying ballast aggregates on lateral resistance of a single sleeper. As the main result of the current study, a high accurate regression equation for constant weight 319.2 kg and constant density 2500 kg/m3 of the sleepers was fitted between different sleeper contact areas and the maximum lateral resistance of a concrete sleeper for 3.5 mm lateral displacement in ballasted railway tracks. The obtained results showed that the effect of the sleeper’s head area compared to the underlying area of the sleeper and the head area of the sleeper compared to the sleeper’s side area in terms of lateral resistance are 8.2 times and 14.5 times more, respectively.

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