Journal of Jilin University(Engineering and Technology Edition) ›› 2021, Vol. 51 ›› Issue (3): 956-964.doi: 10.13229/j.cnki.jdxbgxb20200154

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Effect of void characteristics on virtual shear fatigue life of asphalt mixtures using discrete element method

Yong PENG1(),Han-duo YANG1,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:2020-03-13 Online:2021-05-01 Published:2021-05-07

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Abstract:

This paper aims to investigate the effect of void characteristics on the virtual shear fatigue life of asphalt mixtures. Using image techniques and three-dimensional （3D） Discrete Element Method （DEM）， the micromechanical models for the shear fatigue life of asphalt mixtures were established considering the real void size and distribution and random void size and distribution. The shear fatigue lives of asphalt mixtures with different aggregate sizes， binder contents， and temperatures were simulated based on these models. Some simulation results were compared with the experimental results. Research results show that the shear fatigue life of asphalt mixtures can be simulated using 3D DEM， and void characteristics significantly affect the virtual shear fatigue life. With the same model parameters， the shear fatigue life considering the real void size and distribution is less than that considering the random void size and distribution， but is closer to the experimental results. Furthermore， aggregate size and binder content also remarkably affect the shear fatigue life of asphalt mixtures. The shear fatigue life increases with the nominal maximum aggregate size （NMAS）. Under the same conditions of NMAS and temperature， the shear fatigue life is the lonest with the optimal binder content. Under the same conditions of NMAS and binder content， the shear fatigue life decreases as the temperature increases.

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

CLC Number: 

  • U414

Fig.1

Repeated uniaxial penetration test"

Table 1

Aggregate gradations"

级配类型通过方筛孔(mm)的质量分数/%
26.519.016.013.29.54.752.361.180.60.30.150.075
AC1310010010094.084.758.625.622.417.512.69.27.0
AC1610010093.984.264.940.925.818.515.510.17.86.2
AC2010095.382.970.360.639.018.215.912.38.96.54.9

Fig.2

3D discrete element model for the repeateduniaxial penetration test"

Table 2

Parameters of the Burgers model"

混合料类型沥青含量/%温度/℃麦克斯韦尔模型开尔文模型
E1/MPaη1/(MPa·s)E2/MPaη2/(MPa·s)
AC134.4600.6083.130.050.81
4.7600.87109.400.101.54
4.9600.3970.300.040.60
4.7402.89294.650.369.74
AC164.4600.43112.080.051.18
AC204.2600.54115.880.121.72

Fig.3

Number of load repetitions-displacement curves in the virtual shear fatigue test for asphalt mixtures"

Table 3

Virtual shear fatigue life of asphalt mixtures"

混合料类型沥青含量/%温度/℃模型中空隙剪切疲劳寿命/次

平均值

/次

1#2#
AC134.460真实6 4715 9446 208
随机7 6156 6237 119
4.760真实7 9437 3387 641
随机8 1777 7417 959
4.960真实5 5314 4775 004
随机6 1124 5335 323
4.740真实157 731138 642148 187
随机162 684143 679153 182
AC164.460真实12 75712 97112 864
随机13 02413 41713 221
AC204.260真实15 47816 54416 011
随机18 17320 25419 224

Fig.4

Number of load repetitions-displacement curves in the laboratory shear fatigue test for asphalt mixtures"

Table 4

Fatigue life in the laboratory shear fatigue test for asphalt mixtures"

混合料类型沥青含量%温度/℃剪切疲劳寿命/次平均值/次
1#2#3#4#5#
AC134.4605 9945 7575 2335 0654 7965 369
4.7608 0186 5569 2268 2788 2368 063
4.9604 7984 4243 7584 0784 1314 238
4.740140 022146 148150 876157 284151 920149 250
AC164.46012 99813 12211 21812 19915 03812 915
AC204.26015 56216 61414 15415 95715 99615 657
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