Problem areas such as low spots, alligatored areas, potholes, water flow problems, humps, and the other problem areas can be fixed four different ways:
- Remove and Replace
- Mill and Replace
- Overlay (Skin Patching)
- Infrared Patching
Remove and Replace
This is the traditional way of repairing asphalt when sub base failure is the problem. This method requires saw cutting the failed area, removing the old asphalt and replacing with new asphalt. This method is performed so the contractor can check the sub base beneath the asphalt to determine the cause of the asphalt failure. This is the most time consuming and expensive way to patch asphalt as it requires additional labor, equipment, and materials.
Mill and Replace
This method is similar to the remove and replace method, except not all of the existing asphalt has to be removed. The section to be patched is milled to a depth of 1” to 2”, the old material is removed, a tack coat is applied to the asphalt for adhesion between the layers, then new asphalt is installed bringing the failed area up to grade.
This method is installing asphalt above the existing asphalt grade. Generally this type of repair is the least expensive and a temporary fix to the problem. This method is commonly used when the asphalt sinks next to garage doors or any other concrete slab to bring the asphalt back up to the grade. This is when wedges are installed.
Infrared patching is a way to recycle the existing asphalt through the use of infrared rays. This repair is done by heating the asphalt from the inside out allowing us to heat the asphalt to 325° degrees without burning the asphalt. When the patch is completed, you will have a repair that is level with the original grade. This process can save time and money when patching a large amount of areas.
One disadvantage to infrared patching is that you are limited to patching areas the size of the burner.