TM 5-822-11/AFP 88-6, Chap. 7
(2) Small cracks ( to inch) should be
cleaned using compressed air. In some instances,
widened to a nominal width of c inch greater than
it may be necessary to use a sandblaster or wire
the existing nominal or average width using a
brushes to remove debris that cannot be removed
router. Widening the cracks c inch will help
by compressed air.
eliminate the potential for raveling of the pave-
(1) If sandblasting equipment is used, a
ment along the edges of the crack and will provide
technique that enables both faces of the crack to be
a sealant reservoir that has vertical faces. The
cleaned should be established. A multiple pass
depth of the routed crack should be approximately
technique, as described for cleaning joints and
inch.
cracks in PCC, should be used. The pavement
(3) Medium Cracks ( to 2 inches)
surface approximately 1 to 2 inches on both sides
generally require no routing, but some repair may
of the crack should also be sandblasted to re move
be required.
debris away from the crack. Extreme care must
(4) Large Cracks (greater than 2 inches) re-
be used to prevent the cracks from being over-
quire crack repair instead of routing. Cracks
blasted.
greater than 3/4 inch with medium or high sever-
(2) Once the crack has been sandblasted or
ity raveling should be repaired in accordance with
wire brushed, the crack should be blown out with
TM 5-624/AFR 85-8.
compressed air to remove sand or any debris that
c. Cleaning. Once the damaged areas have been
was loosened during the cleaning. The compressed
repaired and the cracks routed, the cracks can be
air also aids in the removal of moisture.
4-11
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