How many cubic yards of concrete should you order for the job?

U-R preparing to order concrete for some footings at the plant where you work. Each of the cylindrical holes for the footings is 24 inches deep and 7.5 inches in diameter. The concrete company delivers concrete in multiples of one half a cubic yard. How many cubic yards of concrete should you order for the job?

How many cubic yards of concrete should you order for the job?
27 cu feet in 1 cu yd. One cubic yard is equal to 27 ft X 1 ft X 1 ft., so 1/2 cu yard is equal to 13.5 ft X 1 ft X 1 ft. Footing is 24 inches deep so now we have 6.75 ft X 1 ft X 2 ft. To calculate area of a circle, formula is a=pi (r X r).

r = 3.75

3.14 X 3.75 X 3.75 = 44.156 sq inches. 144 sq inches in a sq foot, so approximately .3 sq ft for area.



Each 1/2 yard should do about 20 holes.
Reply:Do your own homework.
Reply:you forgot to mention how many piers you are pouring. find the area of each cylinder in cu. inches. convert to cu. ft. times the number of holes. then convert this to cu. yds.
Reply:Determine the cubic yards needed. Or go purchase a few sacks of quik-creik and diy.

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