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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 Divide the water in one cubic yard of the mix (weight in pounds) by the cement in the mix (also in pounds). 2  If the mix has the water listed in gallons instead of pounds, multiply the gallons by 8.33 to figure out the pounds.  The result in decimals is the water ratio. If a cubic yard of the mix has 200 pounds of water and 400 pounds of cement, the water ratio is .50, which is the highest ratio you want if the concrete will experience freezing and thawing in moist conditions.