5 sacks of cement per 1 yard of concrete
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3000 psi 3500?
4500
500psi
3000 psi concrete weighs Approx 3900 Lb/yd3
The strength of concrete on the 28th day is considered full strength with regard to the engineering calculations for its use. Concrete continues to get hard for 100 years or more, as long as it has water on it now and then. For a 6-sack concrete mix, its 28 day compressive strength should be at 4,000 psi or greater.