Using a waste factor of 12 percent, determine the amount of concrete needed to pour the slab shown in Figure 11.44. The slab is 4 inches thick.

What will be an ideal response?


Find the area of the slab as follows:

Area of slab (sf) = 25? × 30? + 15? × 20? = 1,050 sf

Quantity of concrete (cy) = 1,050 sf × 4? / 12 in per ft = 350 cf / 27 cf per cy = 13.0 cy

Add 12% waste.

Quantity of concrete (cy) = 13.0 cy × 1.12 = 14.6 cy – Use 14.75 cy

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