Which method is commonly used to repair reflective cracking in asphalt overlays?

Placing a stress-relief layer is an effective method for repairing reflective cracking in asphalt overlays because this technique specifically addresses the tension and movement caused by underlying cracks. Reflective cracking occurs when stress from the existing pavement is transmitted through the overlay, leading to visible cracks that follow the pattern of the underlying surface.

The stress-relief layer, often consisting of a flexible material such as geotextile or a rubberized asphalt, helps to accommodate the movement of the pavement beneath it. This layer can dissipate the stresses that would otherwise lead to further cracking, thus prolonging the life of the overlay and maintaining a smooth surface.

In contrast, adding more asphalt layers without addressing the underlying issue may only mask the problem temporarily and not provide a long-term solution. A grinding technique might aid in the appearance of the surface, but it does not address the root cause of cracking. Removing the entire overlay is a more invasive and costly approach that may not be necessary if a stress-relief layer can effectively mitigate the cracking.