Standard Concrete Mix Batching Ratios
This reference chart lists standard volumetric batching ratios (Portland Cement : Clean Sand : Coarse Aggregate) and water ratios required for various structural compressive strength targets.
| Target Strength (PSI) | Volume Ratio (Cement:Sand:Stone) | Water Ratio (Gal / 94lb Bag) | Common Application |
|---|---|---|---|
| 2500 PSI | 1 : 2.5 : 3.5 | 6.5 gallons | Residential walkways, fence posts |
| 3000 PSI | 1 : 2 : 3 (Rule of Thumb) | 6.0 gallons | Patios, driveways, house footings |
| 3500 PSI | 1 : 1.5 : 2.5 | 5.5 gallons | Commercial slabs, heavy vehicle pads |
| 4000 PSI | 1 : 1 : 2 | 5.0 gallons | Structural columns, bridge decks, retaining walls |