A building requires 20 feet of the grade beam whose cross section is shown in Figure 11.42. Using a waste factor of 8 percent, determine the number of cubic yards of concrete needed to pour the grade beam.
What will be an ideal response?
First, find the cross-sectional area:
Cross-sectional area (sf) = 12? × 14? /(12 in per ft)2 = 1.167 sf
Volume in grade beam (cy) = 20? × 1.167 sf = 23.34 cf / 27 cf per cy = 0.86 cy
Add 8% waste and round off.
Volume in piers (cy) = 0.86 cy × 1.08 = 0.93 cy – Use 1 cy
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What will be an ideal response?
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