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I am building a curb that will be 26 feet long, 6.5 inches wide and 4 inches deep. How much cement do I need?
It depends on the thickness and the density. One ton should be about 15 cubic feet when compacted, so it would cover 30 square feet 6 inches thick or 45 square feet 4 inches thick or 60 square feet 3 inches thick. It would make a driveway four inches thick, 9 feet wide and 5 feet long or a footpath 3 inches thick, three feet wide and 20 feet long.
Not square yards, but Approx. 5.24 cubic yards 54'2" = 650" x 7'10" = 94" x 4" = 4" = 244,400 cubic inches / 46,656 cubic inches = 1 cubic yard (36" x 36" x 36")= 5.24 cubic yards
Well, you make a sidewalk from concrete, not just cement. Concrete consists of cement, sand, gravel and water. You will need 5.5 cubic feet of concrete. A standard sidewalk grade of concrete would be 1 part cement, 2 parts sand, 3 parts gravel- so the sidewalk needs 0.91 cu ft of cement- about 87 pounds worth- plus sand and gravel. If you want to buy the premixed bags of concrete (like Sacrete), you will need about 17 of the 40 pounds bags. And you did not ask, but 3 inches is kind of skinny- I would go for at least a 4 inch thick sidewalk.
using those dimensions, 38.89 cubic feet not square feet
128
87.5 cubic feet
you would need 37.33 yards of concrete or 38 to be safe
147 cubic feet of cement are required.
Volume = 12 cubic feet = (12 / 27 ) 0.444 cubic yard
(60 x 1.5 x 13/12) / 27 = 3.61 cubic yards
26 square feet.
Essentially, you need three and a third cubic yards of concrete to replace that quantity to those measurements - so if the cost of a cubic yard of concrete is 30, multiply it by 3.333 and you get 100
Volume of concrete required, in square feet = 27 x 4 x 0.5 = 54 cu ft, which is 2 cubic yards, so 80 dollars/pounds/yen/ringgit or whatever.
about 18 cubic feet.
6,400 ft3
14.6944... sq ft = 46x46/144