A bag of Quickcrete weighs 80 lbs dry. When water is added it can weigh another 1.5 to 2 lbs. when the water evaporates it will sill retain some water; so, about 80.5 lbs. The Quickcrete covers 1/2 cu ft. or 2 sq. ft. @ 3" thick. 21X20= 420 sq ft X 40.25= 16,905 lbs. or there abouts.
about 5 yards if your slab is 4" deep
There are too many variables that are not quantified in the question to answer this. What kind of concrete? (There are different kinds.) Is the concrete reinforced? How is the square of concrete supported? What is the nature of the load and how is it distributed on the slab? We could go on.
20" = 1.666666667' 1.666666667 X 1.666666667 X 15 = 41.66666667^3 41.66666667^3 X 125lbs = 5,208.333334 lbs I an assuming that the 20 is in inchs and not feet. If the 20 is feet, than it would be 20 X 20 x 15 x 125.
20%
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about 5 yards if your slab is 4" deep
how many yards of concrete will i need to do a 20 x20 x4 slab
Your question is missing a verb. Do you want it's weight? It's cost? Something else?
A standard paving slab will weigh approximately 70KG, which is about 154 pounds. Of course, it varies in weight according to the actual size of the slab, but that is what the average standard slab will weigh.
20
4.938 cubic yards.
There are too many variables that are not quantified in the question to answer this. What kind of concrete? (There are different kinds.) Is the concrete reinforced? How is the square of concrete supported? What is the nature of the load and how is it distributed on the slab? We could go on.
For a 9' x 20' by 4" slab you will need 2.22 cubic yards.
14.8 cubic yards will work but round to 15 to be sure.
Nothing. Concrete doesn't come in gallons for measuring. Milk is in gallons.
20" = 1.666666667' 1.666666667 X 1.666666667 X 15 = 41.66666667^3 41.66666667^3 X 125lbs = 5,208.333334 lbs I an assuming that the 20 is in inchs and not feet. If the 20 is feet, than it would be 20 X 20 x 15 x 125.
The area of that slab is (60 x 20) = 1,200 square feet = 1331/3 square yards.But that doesn't tell you how much concrete you'll need in order to pour it.What you really want to know is the cubic yards of volume required. That'swhat the concrete guys are talking about when thery say "yards" of concrete.1 cubic yard = 27 cubic feetVolume = (length) x (width) x (height) = (60 x 20 x 1/2) = 600 cubic feet = 222/9 cubic yards.( 22.22222... )