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www.reference.com/world-view/many-square-feet-can-60-lb-bag-pre-mixed-concrete-751fd28825b849d4

The amount of concrete that comes from a 60-lb. bad of pre-mixed concrete depends on what depth in which the slab is being poured. The Quikrete concrete calculator can help builders determine how much concrete they'll need to perform a given job based on the size of the slab desired.

To pour a 4-inch slab that measures 1 square yard, use six 80-pound bags of concrete, and for a 6-inch slab, use eight 80-pound bags of concrete. One 80-pound bag of concrete covers 4 square feet at a thickness of 2 inches.

www.reference.com/world-view/many-cubic-feet-80-pound-bag-concrete-d47f0e31b26a3479

An 80-pound bag of concrete yields 0.60 cubic feet of wet concrete when mixed with the proper amount of water. Concrete consists of portland cement, sand, stone, gravel and additives that make the substance cure when it dries. An 80-pound bag needs about 6 pints of water to mix properly.

It will take 60 60-pound bags of ready-mix concrete to make one cubic yard of concrete. This yield is approximate and does not include allowance for uneven subgrade, waste, etc.

www.reference.com/article/mix-concrete-hand-f90a903e6df47409

To mix concrete by hand, pour half of the ballast on the working surface, and make a crater in the middle. Pour cement into the crater, pour the remaining ballast over the cement, and mix with a shovel. Add water, and mix until the mixture is smooth and plastic.

www.reference.com/article/many-90-pound-bags-concrete-needed-3-cubic-feet-7d27ab07847f0cf9

It requires two 80-pound bags of standard concrete mix for a 4- to 6-inch-thick concrete slab that is 2.0801 square feet, which is equal to 3 cubic feet. So, two 90-pound bags of concrete should get the job done.

www.reference.com/world-view/many-bags-concrete-cubic-yard-a3ff3c2e7b4184d7

There are 45 80-pound bags and about 60 60-pound bags of concrete in a cubic yard. Each 80-pound bag of concrete covers about 0.6 cubic feet. There are 27 cubic feet in a cubic yard: 27/.6 = 45.