UFC 3-270-07
12 August 2002
2-2.4.2.22 Install and anchor the FRP mat cover. The sand-grid repair must have a
FOD cover installed to be operational.
2-2.4.2.23 Verify that the repair does not exceed surface roughness criteria.
Figure 2-2. Sand Grid Repair
FOD cover (required)
406 mm (16 in), 2 layers of sand-grids,
backfilled and compacted
Backfill debris, 4 CBR
2-2.4.3
Stone and Grout Repair (Above Freezing Temperatures). See Figure 2-3.
2-2.4.3.1 This type of repair is considered a sustainment airfield repair. It may be used
as a replacement for both the crushed stone and sand-grid repairs when additional
resources are available. Uniform compaction of backfill material is critical.
2-2.4.3.2 If upgrading a sand grid or crushed stone repair, try to recycle previous repair
materials.
2-2.4.3.3 Clear debris from around the crater at least 6 meters (20 feet) in all directions
to allow identification of the upheaved pavement surface. Identification and removal of
all upheaved or damaged pavement is critical. It cannot be rolled down flush with
the existing pavement and left. The upheaved pavement will eventually break up and
create additional problems adjacent to the crater.
2-2.4.3.4 Perform a profile measurement and visual inspection to identify and mark
upheaval around the crater.
2-2.4.3.5 Break out the upheaved pavement.
2-2.4.3.6 Square the sides to vertical from the original pavement surface down to a
minimum depth of 406 millimeters (16 inches).
2-2.4.3.7 All debris material in excess of 304 millimeters (12 inches) must be removed
or reduced in size.
2-9
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