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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.
1 Order concrete with a compressive strength that meets your needs. 2  Make sure the aggregate is appropriate to the thickness of the slab you are pouring. 3  Order the mix with a Plasticizer or a Super Plasticizer, and make sure that the water:cement ratio is not over .55:1.trength: Most contractors know that they can specify the STRENGTH of the concrete. Strength of concrete is measured in PSI, or Pounds per Square Inch (or MPa, MegaPascals, the metric version of PSI). A normal strength of concrete for residential driveways is between 3000 and 4000psi (20 â 27 MPa).