UFC 4-150-07
19 June 2001
CPM-2: DRY PACK
Description: Packing a stiff mortar into a confined hole or cavity.
Uses: Filling narrow slots cut during repair of dormant cracks, and filling
cavities/small holes in cross-sectional area that are relatively deep.
Restrictions/Cautions:
a. Use for holes no larger than 225 cm2 (35 inches2) in cross-sectional
area.
b. The depth of the cavity should be equal to or greater than the
smallest surface dimension.
c. DO NOT use for:
1.
Shallow depressions where lateral restraint is not obtained.
2.
Filling behind exposed reinforcing steel.
3.
Holes that extend through the structure.
d. Maintain water content of mortar carefully.
Preparation:
a. Thoroughly clean cavity.
b. Remove all loose or cracked aggregate.
c. Allow to dry at least 2 days before packing.
Portland cement; 1 part clean, dry fine sand; and enough water for a consistency
of thick cream.
Dry Pack Mix: 1 part cement, 2.5 parts sand passing No. 16 sieve, only enough
water so mortar sticks together when squeezed with slight pressure. Take careful
measures to minimize drying shrinkage by selecting a material mix design with a
maximum allowable shortage of 0.05 percent and proper curing.
Placement:
a. Place and compact in layers 10 mm (2/5 inches) thick.
b. Scratch surface of each layer for good bond of next layer.
7-9
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