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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.
The recommended ratio of water to cement is 6 gallons of water per sack (one sack = 1 cubic foot) of cement. Concrete mixed with 6 gallons of water per sack will be 40 percent stronger than the same mix made with 8 gallons per sack.Concrete for your basement will probably be delivered to the site by a local ready-mix company in a truck-mounted mixer unit. satisfactory mix for basement walls, footings and floors is a six-sack mix containing 6 gallons of water per sack and a maximum aggregate size of 1 inch. Basement walls should be a minimum of 8 feet high.