Journal of Jilin University(Engineering and Technology Edition) ›› 2024, Vol. 54 ›› Issue (5): 1258-1266.doi: 10.13229/j.cnki.jdxbgxb.20221156

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Meso-cracking behavior of cement-stabilized macadam materials based on heterogeneous model

Xiao-kang ZHAO(),Zhe HU,Zhen-xing NIU,Jiu-peng ZHANG(),Jian-zhong PEI,Yong WEN   

  1. School of Highway，Chang'an University，Xi'an 710064，China
  • Received:2022-09-07 Online:2024-05-01 Published:2024-06-11
  • Contact: Jiu-peng ZHANG E-mail:zhaoxk@chd.edu.cn;zhjiupeng@chd.edu.cn

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Abstract:

The purpose is to investigate the mesoscopic cracking behavior of heterogeneous cement-stabilized macadam （CSM） materials using the discrete element method （DEM）. According to Weibull distribution material random field， the heterogeneous fracture models with different homogenization levels were established. The virtual semicircular bending （SCB） tests were carried out to simulate the mesoscopic cracking process. The influence of mortar heterogeneity on mesoscopic cracking behavior of CSM was further studied. The results show that the CSM cracks tend to propagate along the weak mortar and the interfacial transition zone， and the fracture of mortar matrix was dominant. The peak strength and failure deformation of CSM material increase with the increase of mortar homogeneity. A small amount of weak mortar matrix is beneficial to improve the structure deformation characteristics and enhance its overall strength. The optimum crack resistance of CSM materials can be obtained by maintaining reasonable homogenization levels of mortar matrix.

Key words: road engineering, cement-stabilized macadam, mesoscopic heterogeneity, semicircle bending test, discrete element method

CLC Number: 

  • U416.214

Fig.1

Mesoscopic model preparation processing"

Fig.2

Particle size distribution of virtual specimen"

Table 1

Material parameters in the DEM model"

细观参数集料内部砂浆内部ITZ集料之间
有效模量 E/Pa55.5e90.17e80.12e855.5e9
刚度比 k5.01.11.15.0
抗拉强度 σ/Pa2.4e70.63e60.42e60
粘结强度 c/Pa2.4e71.26e60.84e60

Fig.3

Relation curve between E(X) and D(X) and homogeneity coefficient α"

Fig.4

Model parameter distribution of the material random field"

Fig.5

SCB loading mode"

Fig.6

Model validation results"

Fig.7

Load-displacement curves of heterogeneous models （α=5）"

Fig.8

Evolution of force chains at different cracking stages"

Fig.9

Meso-cracking evolution"

Fig.10

SCB simulation results of different heterogeneous models"

Fig.11

Number of failed bonds of different heterogeneous models"

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