Want this question answered?
You need to specify the slab's width and the length as well.
11.852 cubic yards
That depends on the size of your bags! My bags are 25 kg (20 l) 5 inches is 120 mm I would use 2 bags of cement and 4 bags of sand and 6 bags of gravel (well I do not buy my gravel in bags but the equivalent volume). I would mix with as little water as necessary to get a pourable consistency.
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.
129
18 bags (80 pounds) of quikrete for a 4 inch thick slab.
3.95 cubic yards of cement are needed for a slab that size.
20
A 15' x 20' x 4" slab needs at least 3.7 cubic yards.
1.19 Cubic Yards
You need to specify the slab's width and the length as well.
You will need 3.1 cubic yards or 139 80lb bags. This assumes a waste of about 5% which is typical.
You need to specify the slab's width and the length as well.
You will need 27.6 cubic yards of cement.
8 square yards
If your talking about 4'x4'x4" thick it will take about 12 bags. Most 60# bags will do .45 cubic feet and that slab would be about 5.3 cubic feet wich equals 11.77 bags.. Mike