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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.
Both concrete calculators make an allowance for the fact that ballast etc losses volume when mixed to make concrete. Two Concrete Calculator are provided for different concrete mixes: 1  General mix - 1:5 cement:all-in ballast or 1:2Â½:3Â½ cement:sharp sand:gravel. 2  and.