Using a waste factor of 7 percent, determine the number of cubic yards of concrete needed to pour the continuous footings shown in Figures 11.36 and 11.37. Assume that the wall is centered over the footing.
What will be an ideal response?
The footings extend 11 inches beyond the wall on both sides. The lengths of the footings are shown in Figure 11-1.
Length of Footing (ft) = 22?10? + 5? + 15? + 16?10? + 37?10? + 21?10? = 119.33?
Cross-sectional area (sf) = 2?6? × 1? = 2.5 sf
Volume of concrete (cy) = 2.5 sf × 119.33? = 298 cf / 27 cf per cy = 11.04 cy
Add 7% waste and round off.
Volume of concrete (cy) = 11.04 cy × 1.07 = 11.81 cy – Use 12 cy
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