Finite Element Method Modeling of Reflective Cracking Initiation and Propagation: Investigation of the Effect of Steel Reinforcement Interlayer on Retarding Reflective Cracking in Hot-Mix Asphalt Overlay

Abstract

In overlaid pavements, working cracks in existing pavement systems propagate upward to the new pavement surface and cause reflective cracking, one of the most serious causes of deterioration in overlay systems. Several techniques to reduce reflective cracking have been introduced. However, the reflective cracking mechanism is not yet well understood. Fracture mechanics have been applied in pavement analysis to investigate crack development. A single-edge notched beam test was simulated with the finite element method with the cohesive zone model, which has been widely used to simulate a cohesive crack. The effects of steel reinforcement, interface, and hot-mix asphalt (HMA) properties on crack initiation time and crack propagation rate were investigated. A damage value, an indication of the degradation of the initial stiffness of the material in cohesive elements, was used to define the degree of softening and to trace crack formation. On the basis of elastic analysis, the crack initiation time for the rei...