When patching a core hole, how should the patch mix be applied for best results?

Applying the patch mix in layers, or lifts, and tamping each lift is the recommended method for achieving optimal results when patching a core hole. This technique allows for better compaction, which is essential for ensuring that the patch bonds well with the existing material and maintains structural integrity.

When each layer is tamped, it eliminates air pockets and helps to achieve a denser, lower-permeability patch, reducing the likelihood of moisture infiltration and subsequent damage. Layering also allows for better control over the final elevation and surface smoothness of the patch, ensuring it integrates seamlessly with the surrounding pavement.

Using one solid application without tamping can lead to inadequate compaction, which may cause the patch to settle or fail over time. Similarly, simply pouring the mix in or allowing it to set without proper compaction would not provide the necessary structural stability for the repair. Thus, layering with tamping is key to a durable and effective patch.