15 March 2001
PATCHING (FILLING RUTS AND DEPRESSIONS)
7.1. Introduction. Ruts and depressions are frequently repaired by filling the distressed areas
with layers of asphalt. The procedure is usually a temporary repair. If the rut or depression area
is accompanied by alligator cracking, full- or partial-depth repairs should be conducted.
7.2. Procedural Steps. The following steps should be conducted to repair a rut or depression.
7.2.1. Determine repair boundaries. If a depression or rut is to be repaired, the repair area
should extend to where the area is the same elevation as the surrounding pavement. For repair
of other distresses, the repair should extend beyond the distress (usually 1 foot (300 millimeters))
and into sound pavement.
7.2.2. Cut the patch and remove pavement. For repair of depressions and ruts, the edges shall
be sawed or a grinder can be used to grind down the pavement. A vertical edge should be at
least 2 inches (50 millimeters) deep. If the edges are saw cut, a lightweight jackhammer should
be used to remove the pavement along the edges by placing the jackhammer about 3 inches (75
millimeters) inside the patch area with the hammer toward the edge. This will avoid damaging the
7.2.3. Prepare area. After removal of the pavement from the patch area, the area should be
thoroughly cleaned with high-pressure air, brooms, water, or combinations of these. The area
should also be dry before applying the tack coat. After the repair area is clean and dry, a tack
coat is applied to the edges and bottom of the patch area. Apply the tack as discussed in
Paragraph 4.5.2. The tack shall be allowed to cure.