Journal of Jilin University(Engineering and Technology Edition) ›› 2025, Vol. 55 ›› Issue (2): 653-663.doi: 10.13229/j.cnki.jdxbgxb.20230510

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Aggregate ellipsoidal surface base reconstruction with virtual splitting tests

Yan-hai YANG1(),Bai-chuan LI1,Ye YANG1,2,Chong-hua WANG1,Liang YUE1   

  1. 1.School of Transportation and Geomatics Engineering，Shengyang Jianzhu University，Shenyang 110168，China
    2.College of Transportation Engineering，Dalian Maritime University，Dalian 116026，China
  • Received:2023-05-22 Online:2025-02-01 Published:2025-04-16

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Abstract:

To explore the effect of mesoscale structure of aggregates in asphalt mixtures on the macroscopic properties， the secondary shape parameters length-width ratio and width-thickness ratio were used to characterise the real aggregates was proposed in this paper using X-ray CT. On the basis of the secondary shape parameters， the aggregate was reconstructed used an ellipsoidal surface base， the specimens was generated for splitting tests in PFC3D using the servo control. The results show that the angularity aggregates model had the highest accuracy when the length-width ratio was taken as 1.5 and the width-thickness ratio was taken as 0.98. In the reconstruction of angularity aggregates， the length-width ratio should avoid exceeding 2.0. Elongate aggregates hindered the formation of a stable aggregate skeleton， flat aggregates made the tension in the centre of the mixture not obvious. Well angularity aggregates improved the tensile properties. The ellipsoidal surface based of the aggregate reconstruction method was an accurate and efficient modelling method.

Key words: road engineering, asphalt mixture, X-ray CT, discrete element method, random aggregate, mesoscale

CLC Number: 

  • U414

Fig.1

Origin CT image"

Fig.2

Image process flow chart"

Fig.3

Ortho slice image"

Fig.4

Three dimension rendering image"

Fig.5

Aggregate parameter distribution"

Fig.6

Elliptic primitives"

Fig.7

Three-dimension virtual aggregate stl model"

Fig.8

Gradation curve"

Fig.9

Virtual specimen forming process"

Table 1

Basic parameters for calculation"

宏观模型细观参数符号取值
集料-集料线性粘结模量cb_emod2×106
摩擦系数μ0.5
刚度比kratio2.4
集料-砂浆平行黏结模量pb_emod1×108
抗拉强度pb_ten6×106
粘结力pb_coh5×106
摩擦系数μ0.5
平行粘结半径r1.2×10-3
砂浆平行粘结模量pb_emod7.5×107
抗拉强度pb_ten4.5×106
粘结力pb_coh3.75×106
摩擦系数μ0.5
平行粘结半径r1.2×10-3

Fig.10

Splitting test results under different length-width ratio"

Fig.11

Splitting test results under different width-thickness ratio"

Fig.12

Asphalt mortar composition under different elongated aggregates grade"

Fig.13

Aggregates composition under different elongated aggregates grade"

Fig.14

Load displacement of different elongated aggregates grade"

Fig.15

Load displacement of different flat aggregates grade"

Fig.16

Asphalt mortar composition under different flat aggregates grade"

Fig.17

Aggregates composition under different flat aggregates grade"

Table 2

Comparison of numerical simulation results with lab test results"

项 目长宽比宽高比
1.31.51.740.60.80.98
模拟试验/MPa1.151.000.990.980.730.99
室内试验强度均值/MPa1.051
误差/%9.45.15.87.243.96.1

Table 3

Different aggregate template running time"

项目Clump替换导入平衡伺服平衡加胶结
椭球重构7.5s2m15s5h24m10s2m29s
真实骨料3m12s2m46s5h41m47s3m10s
效率提升/%256023.05.427.5
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