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nw NC | "Then 90 more yards in the whole rest of the silo."
You had better recalculate that. My rough calculations show a little more than double that.
30 feet inside diameter with 6 inch thick walls equals 31 feet outside diameter. Multiply by 3.14 to get the circumference ( length of wall) = 97.34 feet. Two feet of wall length 6 inches thick, one foot high takes one cubic foot of concrete. 48.67 cubic feet per foot of height X 100 feet = 4,867 cu ft, divide by 27 cubic feet per yard = 180.26 cu. yds.
Online concrete calculator agrees. Picture below.
Edited by WJKEIGER 3/23/2024 11:14
 (Capture.JPG Concrete calculation. (full).JPG)
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 Capture.JPG Concrete calculation. (full).JPG (25KB - 11 downloads)
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New upright poured concrete silo
