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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.
Water/cement ratio. As engineers will tell you, the water/cement ratio is the weight of the water per yard in the mix divided by the weight of cement per yard. Concrete's water/cement ratio is usually somewhere between .4 and .6. As an example, let's take an average yard of concrete, a typical five-bag residential mix.