Page 57 - Masonry and Concrete

Concrete Construction Techniques
56 CHAPTER THREE

PLYWOOD FOR SHORT
RADIUS CURVES–GRAIN VERTICAL

STAKES AT
12–24"

1 OR 2 LUMBER FOR
LONG RADIUS CURVES

STAKES AT
2–3 FT

SAW KERF 2 LUMBER
ON INSIDE OF CURVE
FOR BENDING

1
KERFS / 2 TO
2 / 3 OF THICKNESS
FIGURE 3-16
Curved forms (from Portland Cement Association, The Homeowner’s Guide to Building
With Concrete, Brick and Stone, PCA, Skokie, Illinois).

water by one pound. If your sand is “very wet,” increase the quantity of
sand in Table A by one pound and decrease the water by one pound.
The moisture content of sand is more difficult to adjust for when pro-
portioning mixes by volume rather than weight. Up to a point, wet sand
“bulks” to a greater volume than dry sand, and the amount of volume
increase depends not only on the amount of moisture, but also on the

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