Page 291 - Masonry and Concrete

Paving

290 CHAPTER EIGHT

allow for the thickness of the driveway slab and the drainage layer,
plus the height of the curb. The concrete thickness tapers down from
the edge of the curb to the flat surface of the driveway.
Start pouring concrete in the farthest corner of the forms. As soon as
the first few feet of the driveway are poured, begin striking off or screeding
the surface level with the top of the forms. Use a length of 2 4 that is
slightly wider than the forms. For wide driveways, a 2 6 will be
stronger, and a temporary screed may be needed down the middle for
striking and leveling drives wider than 20 ft. Continue transporting and
dumping and screeding the concrete until the forms are full. The easiest
way to do the apron at a street with existing curbs is to set the formwork
in two parts. Set temporary formwork at the sides of the flat center section
of the apron to use as strike off boards (Figure 8-12). These will be
removed as soon as the concrete in the center section is poured and
struck, and the concrete in the side sections can be poured immediately
afterwards. Shape the tapered concrete at the edges of the driveway apron
by hand or with a wood float, tapering it from the top of the street curb
and sloping it down into the flat surface of the driveway (Figure 8-13).

STRIKE CENTER
SECTION OF
TEMPORARY
CONCRETE
SIDE FORM
LEVEL WITH
SIDE FORMS
FIGURE 8-12
Driveway apron forms.

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