Page 72 - Masonry and Concrete

Concrete Construction Techniques
71
CONCRETE CONSTRUCTION TECHNIQUES

ing occurs, wait until the concrete has
cured a little longer. After the initial
brushing, brush the surface again while
simultaneously washing away the loos-
ened concrete with a garden hose. The
water spray should be strong enough to
remove the loosened concrete, but not so
strong as to blast the aggregate loose or
gouge the surface. Continue washing and
brushing the surface until the runoff water
is clear and the top one-third to one-half of
the aggregate is uniformly exposed.
To produce a flagstone pattern, bend a
3
1
length of 2-in. or 4-in. diameter copper FIGURE 3-32
pipe into an “S” shape. After the concrete
Steel finishing trowel.
has been bull floated or darbied, use the
pipe to cut a random flagstone pattern
1
into the concrete surface, forming grooves that are about 2-in. deep
(Figure 3-35). When the surface water has evaporated, float the sur-
face and retool the grooves. When you are finished, brush out the

FIGURE 3-33
Knee boards. (Photo courtesy PCA).

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