What should be done after filling a hole with patch mix during core sampling patching?

After filling a hole with patch mix during core sampling patching, it is essential to tamp each lift if the patching material is placed in layers. This process is crucial because tamping compacts the material, ensuring better adhesion between the patch and the existing pavement, reducing air voids, and increasing the overall strength of the repair. Proper compaction also helps to prevent future settlement or cracking in the patched area, which could occur if the material is not adequately consolidated.

Layers are often used to control the thickness of the patch and manage the curing process, and tamping them effectively creates a dense and stable surface. This ultimately contributes to the longevity and durability of the patch, ensuring it integrates well with the surrounding pavement.

The other options present alternative approaches but do not address the critical aspect of compaction necessary for an effective repair. For example, leaving it untouched for a day may result in inadequate bonding and potential issues with the integrity of the patch. Covering with plastic may help in moisture retention but doesn't ensure proper compaction. Similarly, painting the surface, while it can protect the surface, does not address the requirement for void reduction through tamping. Therefore, the necessity of tamping each lift is vital for achieving a successful and durable patch repair