A building requires 35 feet of the grade beam whose cross section is shown in Figure 11.43. Using a waste factor of 10 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? × 16? = 1.333 sf
Volume in grade beam (cy) = 35? × 1.333 sf = 46.66 cf / 27 cf per cy = 1.73 cy
Add 10% waste and round off.
Volume in piers (cy) = 1.73 cy × 1.10 = 1.90 cy – Use 2 cy
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