Analysis of Flexural Fatigue Failure and Degradation Reliability of Cement Concrete for Highway Pavements

This paper analyzes the fatigue failure and model degradation reliability of cement concrete for highway pavement. The fatigue test results were investigated and analyzed through the Weibull distribution. The distribution parameters were estimated by several numerical methods. The average parameters were used to incorporate probability distribution into the cumulative process of flexural fatigue damage. A new calculating method of the reliability was proposed. The reliability of concrete in pavement was calculated. The results show that the flexural fatigue life of cement concrete in pavements follows the two-parameter Weibull distribution. The Weibull parameters obtained are close to each other. The dispersion of flexural fatigue life decreased with the increase of applied stress level. The evolution of reliability for concrete in pavement consists of three stages and may correspond to different stages of cracking.