UFC 3-270-01
15 March 2001
CHAPTER 3
FULL-DEPTH AND PARTIAL-DEPTH PATCHES
3.1. Introduction. Various distresses (see Paragraph 2.2.) can be repaired by using full-depth
or partial-depth patches. A graphic presentation for the emplacement of a full-depth patch and
utility cut repair on an ACC pavement is shown in Figures 3.1. and 3.2., respectively. Full-depth
repairs involve removal of the complete pavement down to the subgrade or to an intermediate
base or subbase layer that is intact. Partial-depth repairs usually involve removing the failed
bituminous surface excluding the base course and replacing the surface layer with hot-asphalt
plant mix.
3.2. Procedural Steps (Full-Depth Patch). The following steps should be conducted for the
placement of a full-depth patch.
3.2.1. Mark the repair area. A string line or straight edge should be used to mark straight lines
around the repair area. The lines should be marked with spray paint so they are easily visible
when sawing the pavement. Repair areas should be marked to form a square or rectangle with at
least 12 inches (300 millimeters) beyond the distressed area (Figure 3.3.).
3.2.2. Saw the pavement. A concrete saw equipped with a diamond-tip or abrasive blade
(Figures 3.4. and 3.5.) is used to saw the pavement. Saw cuts shall overlap so that a vertical and
square corner is formed (Figure 3.6.). Since diamond-tip blades usually require water, the repair
area should be completely dry before it is repaired. However, there are some types of
diamond-tip blades designed to dry cut asphalt pavements. The abrasive saw blade has
advantages of lower cost and does not require water when sawing. A disadvantage is that the
abrasive blade tends to wear quickly. One should make sure that the saw blade is the correct
diameter to allow cutting to the full depth of the pavement. Make sure that the saw blade is rated
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