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.
Concrete is used for floors, foundations, sidewalks, roads, curbs, steps, footings, ramps, patios and driveways. For small applications, concrete should be poured to a thickness of at least 2 inches.
There are approximately 5,500 ready-mix concrete plants in the United States, with about 55,000 trucks able to deliver the product. The industry produces nearly $30 billion of concrete annually.