Journal of Jilin University(Engineering and Technology Edition) ›› 2023, Vol. 53 ›› Issue (1): 178-187.doi: 10.13229/j.cnki.jdxbgxb20210482

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Influence of aggregate contact characteristics on shear fatigue life of asphalt mixtures using discrete element method

Yong PENG1(),Xiu-fang ZHANG1,Ze-yu GUO1,Xue-yuan LU2,Yan-wei LI3,4   

  1. 1.Institute of Transportation Engineering，Zhejiang University，Hangzhou 310058，China
    2.Anhui Transportation Holding Group Co. ，Ltd. ，Hefei 230088，China
    3.Hebei Provincial Communications Planning and Design Institute，Shijiazhuang 050011，China
    4.Research and Development Center of Transport Industry of Technologies，Materials and Equipments of Highway Construction and Maintenance，Shijiazhuang 050011，China
  • Received:2021-05-31 Online:2023-01-01 Published:2023-07-23

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Abstract:

The main purpose of this study is to investigate the influence of aggregate contact characteristics on shear fatigue life of asphalt mixtures using discrete element method （DEM）. On the basis of the internal structure information of asphalt mixtures that was acquired by CT scanning and imaging technology， the aggregate contact characteristics were obtained using a program written in MATLAB. Three-dimensional （3D） discrete element models for the shear fatigue test of asphalt mixtures were established using a DEM code called Particle Flow Code in Three Dimensions （PFC3D） to simulate the shear fatigue life of asphalt mixtures considering fatigue damage. Simulation results were verified by performing laboratory shear fatigue tests. Research results show that the shear fatigue test of asphalt mixtures can be simulated by 3D DEM considering fatigue damage， and a comparison of simulation and laboratory results shows relatively good agreement. Aggregate contact point and contact length significantly influence the shear fatigue life of asphalt mixtures， and the shear fatigue life increases with the increase in aggregate contact point and contact length. The contact orientation of aggregates on the horizontal cross section marginally influences the shear fatigue life， and the correlation between them is not obvious. Furthermore， aggregate size and void content significantly influence the aggregate contact characteristics in asphalt mixtures. Under the same test conditions， the number of aggregate contact points and total aggregate contact length increase with the increase in aggregate size， while decrease with the increase in void content.

Key words: road engineering, asphalt mixture, aggregate contact characteristics, shear fatigue life, discrete element method

CLC Number: 

  • U414

Table 1

Aggregate gradations"

级配类型通过下列筛孔（方筛孔，mm）的质量分数/%
26.519.016.013.29.54.752.361.180.60.30.150.075
AC1310094.084.758.625.622.417.512.69.27.0
AC1610093.984.264.940.925.818.515.510.17.86.2
AC2010095.382.970.360.639.018.215.912.38.96.54.9

Table 2

Void contents of asphalt mixture specimens"

级配类型

油石比

/%

空隙率 /%平均值
1#2#
AC134.92.32.62.5
4.04.34.1
5.15.85.5
AC164.63.83.33.6
AC204.43.93.73.8

Fig.1

Repeated uniaxial penetration test"

Table 3

Numbers of aggregate contacts in asphalt mixtures"

级配类型油石比/%空隙率/%试件编号接触点数量/个总接触长度/像素接触方位角/（°）
AC134.92.51#7 70369 31845.3
2#7 53868 54044.9
4.11#6 22858 21344.7
2#5 70554 36845.0
5.51#4 43635 06448.4
2#4 27033 22748.5
AC164.63.61#9 04385 00243.7
2#9 53288 94245.8
AC204.43.81#10 70799 42442.9
2#11 667106 08745.9

Table 4

Parameters of Burgers model at 60 °C"

级配类型

油石比

/%

麦克斯韦尔模型开尔文模型
E1/MPaη1/（MPa·s）E2/MPa

η2/

（MPa·s）

AC134.90.87109.400.101.54
AC164.60.43112.080.051.18
AC204.40.54115.880.121.72

Fig.2

Displacement-number of load repetitions curves in virtual shear fatigue test under different working conditions"

Table 5

Shear fatigue life in virtual shear fatigue test of asphalt mixtures"

级配类型

油石比

/%

空隙率

/%

剪切疲劳寿命模拟值/次

平均值

/次

1#2#
AC134.92.511 92511 12311 524
4.17 9317 1227 527
5.54 4993 3973 948
AC164.63.612 72812 97912 854
AC204.43.815 48516 52316 004

Fig.3

Correlation curves between contact characteristics and simulated shear fatigue life"

Fig.4

Displacement-number of load repetitions curves in actual shear fatigue test under different working conditions"

Table 6

Shear fatigue life in actual shear fatigue test ofasphalt mixtures"

级配类型

油石比

/%

空隙率

/%

剪切疲劳寿命试验值/次

平均值

/次

1#2#
AC134.92.512 01411 06211 538
4.18 0186 5567 287
5.54 6634 0794 371
AC164.63.612 99813 12213 060
AC204.43.815 56216 61416 088
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