You can't express a volume of concrete in yards.
How deep? Are you talking about dry mix weight or finished weight? Concrete weighs 150 pounds per cubic foot. So if you have a 6" slab, that's 150# for 2 square feet. For a 4" slab, the same amount will cover 3 square feet. For a 3" slab, 4 square feet. Concrete mix is commonly sold in 80 pound bags. The finished weight is the mix plus the water that gets chemically bound to it. There's a guide on the bag telling how many bags you need for a given area and thickness.
4.074 cubic yards for every foot the slab is thick.
Concrete is man-made.
You need to specify the slab's width and the length as well.
18 bags (80 pounds) of quikrete for a 4 inch thick slab.
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A 14'x14'x4" inch slab will require 2.42 cubic yards of cement.
You can't express a volume of concrete in yards.
A 6-inch concrete slab can typically support around 150 pounds per square foot.
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The pipe usually goes under the slab.
At least 3 cubic yards for a 4-inch slab. You'll need 4.75 cubic yards for a 6-inch slab.
1.25 cubic yards for a 4-inch slab. 2 cubic yards (1.85) for a 6-inch slab.
A two-inch slab is fundamentally unsound because it's not thick enough. So...go with at least a three inch slab. For a 16-foot x 14-foot x 3-inch slab: The slab is 224 square feet. Divide by four and you get 56 cubic feet. Add 10 percent (because the bottom isn't flat) and you come up with 61.6 cubic feet. There are 0.6 cubic feet in an 80-pound bag, so you need 103 bags. Do not do it this way. It will cost you more money and the pour will be weak and look terrible. You need 2-1/2 yards of concrete from a concrete company. If you make the slab 4 inches thick, you will need 3 yards and that's better because concrete companies don't like to deal in half-yard increments.
2,000,000,000,000,000,000,000,000,000,000,000,000 sacks
1.5 cubic yards of cement are needed for an 11' x 11' x 4" slab.