Plan the Pour
2-4 hoursReview structural drawings, determine concrete strength (PSI/MPa), identify pour sections, and schedule delivery or batch plant timing.
Field context
This workflow is part of 3 niche fields
Professional concrete work planning with volume calculation, mix ratios, formwork guidance, and curing tips for slabs, footings, and foundations.
Review structural drawings, determine concrete strength (PSI/MPa), identify pour sections, and schedule delivery or batch plant timing.
Compute cubic yards or cubic meters of concrete needed, factoring in form thickness, waste (5–10%), and pump line priming volume.
Build and brace formwork, set rebar or mesh per engineering specs, install vapor barriers, and verify elevation and slope before the truck arrives.
Place concrete continuously, vibrate to eliminate voids, screed to grade, float the surface, and apply desired finish (broom, trowel, or stamped).
Cover with curing compound or wet burlap, maintain temperature above 10°C (50°F), keep moist for 7 days minimum, and avoid loading until design strength is reached.
Calculate slab footprint area as the base input for volume estimation. · Calculate formwork surface area for release agent and plywood estimates. · Verify form dimensions and rebar mat coverage area before pour day.
Estimate total concrete volume and bag count for the planned pour. · Compute exact cubic yards/meters including thickness and waste allowance. · Track delivered volume against calculated estimate during the pour.
Convert between cubic yards, cubic meters, and cubic feet for supplier orders. · Convert truck ticket volumes (usually cubic yards) to project units.
Estimate strength gain percentage at 3, 7, and 28 days for scheduling follow-on work.
Standard volume ratios for common residential and light commercial applications.
| Application | Cement : Sand : Gravel | Strength (PSI) | Strength (MPa) |
|---|---|---|---|
| Fence posts, non-structural fill | 1 : 3 : 3 | 2,500 | 17 |
| Sidewalks, patios, driveways | 1 : 2 : 3 | 3,000 | 21 |
| Garage slabs, footings | 1 : 2 : 2.5 | 3,500 | 24 |
| Structural columns, beams | 1 : 1.5 : 2 | 4,000+ | 28+ |
Schedule pours for early morning. Use chilled water or ice in the mix, add retarder admixture, and have enough crew to finish before the surface sets. Hot concrete loses slump rapidly and finishes poorly.
Do not pour on frozen ground. Use heated water, Type III cement, or accelerator admixtures. Maintain concrete above 10°C (50°F) for 48 hours using insulated blankets.
Install isolation joints where slabs meet walls and columns. Control joints at 24–30× slab thickness in feet (e.g., 4" slab → joints every 8–10 feet). Cut joints 25% of slab depth within 24 hours of finishing.
Insert vibrator vertically, penetrate previous lift, and withdraw slowly. Over-vibration causes segregation; under-vibration leaves honeycomb voids. One pass per spot — do not vibrate in a circle.
Every extra liter of water per cubic meter reduces strength by approximately 1.5 MPa (220 PSI). Maintain the designed w/c ratio — add water only with approval and a proportional cement increase.