Formwork Striking Time — Slab Soffit (Props Remain)
Days to reach the striking strength for slab soffit (props remain) from the strength-gain curve at your site temperature.
Stripping slab forms while leaving reshores lets the form cycle to the next floor days earlier — the entire economics of high-rise work. The 50% target assumes props genuinely carry the slab: a reshore that's snug-but-not-loaded is theatre, not structure.
Formula
Note: Striking decisions are safety-critical: this estimate must be confirmed by site-cured cubes/cylinders or a calibrated maturity system, and by the temporary-works engineer.
Days to reach the striking strength for slab soffit (props remain) from the strength-gain curve at your site temperature. A free concrete curing, maturity & strength tool — no sign-up, no upload, instant results in your browser.
About Formwork Striking Time — Slab Soffit (Props Remain)
Formwork Striking Time — Slab Soffit (Props Remain) computes the governing relationship t₂₀ = a·x/(1−b·x) from f(t)=f₂₈·t/(a+bt); site time = t₂₀ ÷ [(T+10)/30] live as you type. Stripping slab forms while leaving reshores lets the form cycle to the next floor days earlier — the entire economics of high-rise work. The 50% target assumes props genuinely carry the slab: a reshore that's snug-but-not-loaded is theatre, not structure. Defaults are pre-filled with realistic values for this exact scenario, and the worked example substitutes your numbers step by step so the math is never a black box.
How to use Formwork Striking Time — Slab Soffit (Props Remain)
- 1Enter your values — Mix 28-day strength, Required strength, Mean curing temperature (sensible defaults are pre-filled).
- 2Read the live results: Required strength, Estimated striking age, Equivalent at 20 °C.
- 3Check the "with your numbers" line to see t₂₀ = a·x/(1−b·x) from f(t)=f₂₈·t/(a+bt); site time = t₂₀ ÷ [(T+10)/30] substituted step by step.
- 4Adjust inputs until the scenario matches yours, then copy or share the result.
Why use Formwork Striking Time — Slab Soffit (Props Remain)?
- ✓Instant, free and private — every calculation runs client-side in your browser; nothing is uploaded
- ✓Built on the stated formula t₂₀ = a·x/(1−b·x) from f(t)=f₂₈·t/(a+bt); site time = t₂₀ ÷ [(T+10)/30] with authoritative sources cited on the page (ACI 347R — Guide to formwork for concrete; IS 456:2000 — Plain and reinforced concrete code of practice; ACI 209R — Prediction of creep, shrinkage and temperature effects)
- ✓Stripping slab forms while leaving reshores lets the form cycle to the next floor days earlier — the entire economics of high-rise work.
- ✓SI ⇄ Imperial toggle converts your inputs in place, so you can work in the units your drawings use
Frequently asked questions
What formula does the formwork striking time — slab soffit (props remain) use?+
It evaluates t₂₀ = a·x/(1−b·x) from f(t)=f₂₈·t/(a+bt); site time = t₂₀ ÷ [(T+10)/30], exactly as published. Sources: ACI 347R — Guide to formwork for concrete; IS 456:2000 — Plain and reinforced concrete code of practice; ACI 209R — Prediction of creep, shrinkage and temperature effects. The substituted worked example on the page lets you verify every step against the textbook.
How should I read the result — and how far can I trust it?+
Stripping slab forms while leaving reshores lets the form cycle to the next floor days earlier — the entire economics of high-rise work. Striking decisions are safety-critical: this estimate must be confirmed by site-cured cubes/cylinders or a calibrated maturity system, and by the temporary-works engineer.
When is this calculator the right tool for the job?+
Days to reach the striking strength for slab soffit (props remain) from the strength-gain curve at your site temperature. A free concrete curing, maturity & strength tool. The 50% target assumes props genuinely carry the slab: a reshore that's snug-but-not-loaded is theatre, not structure. For neighbouring scenarios, the related tools below cover the same engine with different presets.
Does it support both metric and imperial units?+
Yes — the SI ⇄ Imperial toggle converts the values already in the fields, preserving the physical quantity, so you can flip mid-calculation without re-entering anything.
Related tools
- Formwork Striking Time — Beam Soffit (Props Remain)
- Formwork Striking Time — Full Striking (No Reshores)
- Formwork Striking Time — Cantilever Soffit
- Formwork Striking Time — Winter Striking (5 °C)
- Formwork Striking Time — Accelerated Form Cycle (Type III + heat)
- Formwork Striking Time — PT Slab (Strike After Stressing)
- Formwork Striking Time — Bridge Deck Soffit
- Wind Force on Load — Precast Wall Panel
- Gas Dilution — Nitrogen Dioxide (NO₂)
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