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Deyu Zhang
School of Transportation, Southeast University, Nanjing 210096, China.

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Journal article
Published: 02 November 2019 in Materials
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This paper investigated the effects of aggregate mesostructures on permanent deformation behavior of an asphalt mixture using the three-dimensional (3D) discrete element method (DEM). A 3D discrete element (DE) model of an asphalt mixture composed of coarse aggregates, asphalt mastic, and air voids was developed. Mesomechanical models representing the interactions among the components of asphalt mixture were assigned. Based on the mesomechanical modeling, the uniaxial static load creep tests were simulated using the prepared models, and effects of aggregate angularity, orientation, surface texture, and distribution on the permanent deformation behavior of the asphalt mixtures were analyzed. It was proven that good aggregate angularity had a positive effect on the permanent deformation performance of the asphalt mixtures, especially when approximate cubic aggregates were used. Aggregate packing was more stable when the aggregate orientations tended to be horizontal, which improved the permanent deformation performance of the asphalt mixture. The influence of orientations of 4.75 mm size aggregates on the permanent deformation behavior of the asphalt mixture was significant. Use of aggregates with good surface texture benefitted the permanent deformation performance of the asphalt mixture. Additionally, the non-uniform distribution of aggregates had a negative impact on the permanent deformation performance of the asphalt mixtures, especially when aggregates were distributed non-uniformly in the vertical direction.

ACS Style

Deyu Zhang; Linhao Gu; Junqing Zhu. Effects of Aggregate Mesostructure on Permanent Deformation of Asphalt Mixture Using Three-Dimensional Discrete Element Modeling. Materials 2019, 12, 3601 .

AMA Style

Deyu Zhang, Linhao Gu, Junqing Zhu. Effects of Aggregate Mesostructure on Permanent Deformation of Asphalt Mixture Using Three-Dimensional Discrete Element Modeling. Materials. 2019; 12 (21):3601.

Chicago/Turabian Style

Deyu Zhang; Linhao Gu; Junqing Zhu. 2019. "Effects of Aggregate Mesostructure on Permanent Deformation of Asphalt Mixture Using Three-Dimensional Discrete Element Modeling." Materials 12, no. 21: 3601.

Journal article
Published: 07 May 2018 in Applied Sciences
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Based on the Aggregate Imaging Measurement System (AIMS) and the Particle Flow Code in Two Dimensions (PFC2D), an algorithm for modeling two-dimensional virtual aggregates was proposed in this study. To develop the virtual particles precisely, the realistic shapes of the aggregates were captured by the AIMS firstly. The shape images were then processed, and the morphological characteristics of aggregates were quantified by the angularity index. By dividing the particle irregular shape into many triangle areas and adjusting the positions of the generated balls via coordinate systems’ conversion within PFC2D, the virtual particles could be reconstructed accurately. By calculating the mapping area, the gradations in two-dimensions could be determined. Controlled by two variables (μ_1 and μ_2), which were drawn from the uniform distribution (0, 1), the virtual particles forming the specimens could be developed with random sizes and angular shapes. In the end, the rebuilt model of the SMA-13 aggregate skeleton was verified by the virtual penetration tests. The results indicated that the proposed algorithm can not only model the realistic particle shape and gradations precisely, but also predict its mechanical behavior well.

ACS Style

Danhua Wang; Xunhao Ding; Tao Ma; Weiguang Zhang; Deyu Zhang. Algorithm for Virtual Aggregates’ Reconstitution Based on Image Processing and Discrete-Element Modeling. Applied Sciences 2018, 8, 738 .

AMA Style

Danhua Wang, Xunhao Ding, Tao Ma, Weiguang Zhang, Deyu Zhang. Algorithm for Virtual Aggregates’ Reconstitution Based on Image Processing and Discrete-Element Modeling. Applied Sciences. 2018; 8 (5):738.

Chicago/Turabian Style

Danhua Wang; Xunhao Ding; Tao Ma; Weiguang Zhang; Deyu Zhang. 2018. "Algorithm for Virtual Aggregates’ Reconstitution Based on Image Processing and Discrete-Element Modeling." Applied Sciences 8, no. 5: 738.