Using a waste factor of 5 percent, determine the number of cubic yards of concrete needed to pour the foundation walls shown in Figures 10.36 and 10.37.

What will be an ideal response?


The wall lengths are shown in Figure 11-3.



Length of wall (lf) = 21? + 4?4 ? + 15?8? + 18?8? + 36? + 23?8? = 119.33?



Foundation wall concrete (cy) = 119.33? × 10? × 8? / 12 in per ft = 796 cf / 27 cf per cy



Foundation wall concrete (cy) = 29.48 cy



Add 5% waste and round off.



Foundation wall concrete (cy) = 29.48 cy × 1.05 = 30.95 cy – Use 31 cy

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