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Calculating Concrete Cure Times & Formwork Removal
When to safely strip horizontal panels and beams based on structural strength benchmarks.
The Mechanics of Concrete Curing
Concrete does not cure simply by drying; it undergoes a chemical hydration process that builds structural strength over time. To strip formwork safely, the slab must reach sufficient compressive strength to carry its own weight and any construction loads.
Concrete Maturity and Testing Protocols
Key concrete compressive strength benchmarks to verify before stripping or re-shoring:
| Pour Progress | Required Compressive Strength | Maturity Sensor Methods | Permissible Action |
|---|---|---|---|
| Active Placement | 0 to 500 PSI (Green concrete) | Fresh pour temperature logs | Do not disturb formwork |
| 36 Hours Post-Pour | 1,500 to 2,000 PSI | Cylinder compress check or sensor logging | Release dropheads & recover panels; keep shoring props loaded |
| 7 Days Post-Pour | 3,000 PSI (Typical 75% point) | Cylinder crack testing (ASTM C39) | Begin progressive re-shoring removal under peer review |
| 28 Days Post-Pour | 4,000+ PSI (Full characteristic) | Standard design criteria audit | Slab fully cured; all temporary shoring removed |
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