Constitutive Model of Water Immersion Damage to Cement Stabilized Macadam under Water Weak Effect and Uniaxial Compression

To reveal the damage mechanism of cement-stabilized macadam, the mechanical properties of cement-stabilized aggregates immersed in water for different times were examined by uniaxial compression tests, and the evolution of damage factors of cement-stabilized aggregates specimens was investigated. On the basis of theory of Weibull distribution, the material constitutive relationship suitable for the destruction of cement-stabilized macadam materials immersed in water was proposed. Results show that the strength/elastic modulus of cement-stabilized macadam decreases with the increase in immersion time in water, indicating that water has a weakening effect on cement-stabilized macadam. Linear/nonlinear phases appear in the stress-strain curve. The influence of shape parameters on nonpore compression stage is greater than that on pore compression stage. The damage variable remains constant in the early stage. The stress-strain curve of the damage model is in good agreement with that of the test data. The conclusions obtained in this study provide a significant reference for cement-stabilized macadam engineering.