Page 358 - Masonry and Concrete

Retaining Walls
357
RETAINING WALLS

4" PERFORATED
DRAIN PIPE

FIGURE 10-12

Perforated pipe drain.

contraction that accompanies variable moisture content. In climates
subject to freezing, a waterproof membrane can prevent the potentially
destructive action of freeze-thaw cycles when moisture is present in
the units. Walls should cure for at least three weeks before backfilling
begins.

10.2.5 Construction
Concrete retaining walls are formed, poured, and cured in the same
way as concrete foundation walls. The footing should be poured and
formed first, and then the wall formed and poured in a second opera-
tion. Wall forms must incorporate snap ties or spreaders to keep the
sides from bowing. Forms can be stripped after two or three days, the
protruding wire of the snap ties broken off, and the plastic cones pried
out. Since the wall will be exposed to view on one side, the holes left
by the cones should be patched with cement paste.
Joint reinforcement should be installed every 8 in. on center in con-
crete masonry walls and every 16 in. on center in multiwythe brick

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