What is Crocodile Cracking?

The study of pavement fatigue evolved alongside the growth of the automotive industry. Engineers utilized empirical data to model how asphalt layers respond to cyclic loading, leading to modern pavement design standards.

Commonly found in flexible pavements where the subgrade support is inadequate or where the asphalt thickness is insufficient for the volume of heavy vehicle traffic.

Crocodile cracking, or alligator cracking, refers to a pattern of interconnected cracks resulting from the fatigue failure of the asphalt surface layer under repeated traffic loading.

This phenomenon serves as a diagnostic tool for pavement management systems. By quantifying the extent of cracking, engineers can determine whether a road requires simple surface sealing or a complete structural reconstruction.

The mechanism involves tensile stress at the bottom of the asphalt layer. As the pavement undergoes cyclic loading, these stresses exceed the material's fatigue limit, initiating cracks that propagate upward to the surface.