Meso-cracking behavior of cement-stabilized macadam materials based on heterogeneous model
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.
road engineeringcement-stabilized macadammesoscopic heterogeneitysemicircle bending testdiscrete element method
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