These specifications govern the repair of existing bituminous pavements damaged by settling, rutting, alligator cracking, or aggregate raveling.

Infrared Thermal Bond Bituminous Pavement Patching is a method of blending new bituminous concrete material with infrared heated existing material to form a joint free integral mix.

Equipment

1. Pavement Restoration Vehicle (PRV) shall be a truck mounted, self contained pavement maintenance heating system equipped with a fuel system and a heated chamber capable of maintaining the fresh blacktop at a temperature of 275 degrees or higher.
2. The adjustable height infrared heating unit may be truck or trailer mounted to the PRV. The unit shall be equipped with a chamber or chambers capable of heating the existing bituminous pavement to a workable condition without oxidation or burning. There shall be no flame in direct contact with the existing bituminous surface.
3. Compaction shall be achieved with a self-propelled vibratory roller of sufficient size to provide complete compaction to the full heated depth of the patched area. Minimum of 36" wide roller drum wheels.

Materials

New bituminous concrete material for patching shall conform to Department of Transportation specifications. A minimum of 20 percent of new material shall be added to all patched areas.

Construction

1. The infrared heating unit shall be lowered to within six (6) inches of the existing pavement. The heated area must extend at least six (6) inches outside the area of repair. Apply heat to the area continuously until the surface is heated to a depth of approximately two (2) inches. When the blacktop can be worked with a rake, proper heat penetration has been achieved.
2. Etch an outline of the perimeter of the repair area with the back of a rake at least three (3) inches beyond the edges of the repair area. Scarify the existing bituminous surface within the repair area to the full heated depth.
3. Remove enough existing bituminous material (as required by adjacent grades) to allow for the addition of 20 percent new bituminous mix to achieve a blend of 20 percent new/80 percent existing heated material within the area of the patch.
4. Reshape patched area by hand with rake and lute to match grade of existing adjacent pavement.
5. Compact new paving with the specified roller to the full depth of the heated patch. Compacted surface shall be smooth, in texture and shall have positive drainage matching the slope of the existing adjacent pavement.
6. Clean-up site after paving. Remove all debris resulting from patching operation to the satisfaction of the owner.