While all concretes are extremely strong, Quikrete is designed to reach a high degree of strength faster than typical concrete, hence the name. In fact, when installed at a minimum thickness of 2 inches, it can be ready for people to walk on in as little as 10 to 12 hours.
Bag Size and Yield
Quikrete sells its commercial-grade Quikrete 5000 concrete mix in 60- and 80-pound bags. The 60-pound bag makes approximately 0.45 cubic feet of concrete when mixed, while the 80-pound bag yields approximately 0.6 cubic feet when mixed with water.
Although Quikrete can be walked on after just 12 hours, letting it cure for one day allows it to reach up to 1,500 pounds per square inch. As it cures longer, its strength increases. At three days, it can withstand 2,500 psi, and after a week it can handle up to 3,500 psi of pressure. When fully cured after 28 days, Quikrete can withstand a load of 5,000 psi.
Whether you're using a mixing barrel or hand-mixing Quikrete, an 80-pound bag should be combined with 6 pints of water to start. You can add water, as necessary, up to a total of 10 pints per 80-pounds bag. A 60-pound bag starts with 4.5 pints and can go up to 7 pints. You should plan to have at least 1 cubic foot of space in your mixer for each 80-pound, as well.
In warm weather, defined as 70 degrees Fahrenheit or above, Quikrete needs five days to cure. If temperatures are between 50 and 70, it will need seven days. It must be kept above 32 degrees for the first 48 hours after it is first applied. Quikrete recommends adding ice to the mix water on very warm days, and using warmed water on cooler days.
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