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Abstract

To investigate the effect of heterogeneity of cement mortar on the micro-cracking behavior of cement-stabilized macadam (CSM) material, this paper built a circular aggregate micro-fracture model based on the finite element method (FEM). Meanwhile, the micro-cracking behavior of the material was simulated by embedding a zero-thickness cohesive element with a bilinear cohesive zone model, and the material random field with Weibull distribution was introduced to characterize the heterogeneity characteristics of the mortar matrix and interface transition zone (ITZ). Based on virtual semicircular bending (SCB) tests, this paper simulated the micro-cracking process and analyzed the influence of material homogeneity on the micro-cracking behavior of CSM. The results reveal that the built heterogeneous micro-fracture model can achieve accurate simulation of micro-fractures. The generation of macroscopic cracks in CSM material undergoes the process of micro-crack initiation and rapid penetration, and interface and pore defects are the weak areas for micro-crack propagation. The crack resistance of CSM material decreases with the increasing non-uniformity of the random field. It is recommended that effective measures should be taken to improve the mixing uniformity of cement mortar in the actual construction process to enhance the crack resistance of CSM material.

Publication Date

1-18-2024

DOI

10.14048/j.issn.1671-2579.2023.06.046

First Page

290

Last Page

297

Submission Date

March 2025

Reference

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