UFC 4-150-07
19 June 2001
b. Use rounded coarse (10 mm (2/5 inch) minimum) aggregate when
possible.
c. Sand should have a higher proportion of finer sizes.
d. Avoid porous aggregates such as expanded clay, foamed slag, and
pumice.
Placement: The principles of placing tremie concrete apply. Also:
a. Before filling hopper, lubricate the pipe with water, then a cement-
water slurry.
b. Take all precautions to avoid separation of the mix.
c. Always keep discharge buried in the fresh concrete.
d. Control discharge to keep lateral flow of concrete within 0.7 to 1
meter.
Curing: Not applicable underwater. If above water, use wet burlap for 7 days or
use a curing compound.
7-18
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