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A concrete mixture ratio of 1 part cement, 3 parts sand, and 3 parts aggregate will produce a concrete mix of approximately 3000 psi. Mixing water with the cement, sand, and stone will form a paste that will bind the materials together until the mix hardens.
4000 psi, 3500 psi and 3000 psi all refer to the compression strength of the concrete (resistance to downward force in pounds per square inch), usually at 28 days of curing. Ready-mix suppliers sell their concrete based on itâs rated psi and the higher the psi, the more it will cost. In general, 3000 psi is usually used for concrete walls and footings and 3500 psi is used for flat work such as floors and walkways. However, a good contractor who wants to avoid call-backs will use at least a 4000 psi mix for a driveway.