UFC 3-270-07
12 August 2002
operations, or 152 millimeters (6 inches) thick to support C-130 operations. Place the
material in lifts approximately 152 millimeters (6 inches) thick. Compact each lift of
crushed stone using a minimum of four passes of a single drum vibratory roller or two
passes with a 10-ton vibratory roller. One pass of a roller means traveling across and
back in the same lane. If the crushed stone material is placed upon soft subgrade
materials, it may be beneficial to separate the crushed stone from the subgrade with a
geomembrane and to place the crushed stone material in thicker lifts. In any case, the
crushed stone should be compacted with a minimum of four passes of a single drum
vibratory roller or two passes of a 10-ton vibratory roller per each 152 millimeters (6
inches) of thickness. This crushed stone must be compacted to a minimum of 25 CBR.
2-2.4.5.12 The final 304 millimeters (12 inches) is filled with concrete and leveled with
the existing pavement surface.
Figure 2-4. Concrete Cap Repair
304 mm (12 in) concrete cap
Crushed stone, 25 CBR
152 mm (6 in) for C-130; 406 mm (16 in) for C-17
Backfill debris, 4 CBR
2-2.4.5.13 For craters smaller than 9.1 meters (30 feet) in diameter, screeding can
generally be performed by hand. When single craters or overlapping craters form a
damaged area greater than 9.1 meters (30 feet) in diameter, a screed method using a
concrete pedestal is recommended. See Figure 2-5.
2-13
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