What technique is used to eliminate potential reflective cracking in an overlay?

The appropriate technique to eliminate potential reflective cracking in an overlay involves both cracking and seating as well as rubblizing of PCC (Portland Cement Concrete) pavements.

Cracking and seating is a method applied to existing concrete pavements where the concrete is intentionally cracked into smaller sections, and these sections are then seated or compacted down. This process effectively reduces stress transfer from the underlying concrete slab into the overlay, thereby minimizing the potential for reflective cracking.

Rubblizing, on the other hand, transforms the existing concrete pavement into smaller fragments or rubble. This creates a more flexible base for the new asphalt overlay, significantly reducing the likelihood of reflective cracks forming since the rubble behaves more like a granular material rather than a rigid slab. The combination of these techniques helps to ensure that the overlay is better supported and reduces the stresses that can lead to cracking.

By integrating both approaches, the likelihood of reflective cracking is greatly diminished, making option C the most comprehensive and effective answer to the question. This highlights the importance of using well-established techniques in pavement rehabilitation to enhance the longevity and integrity of asphalt overlays.