Formwork Striking Time — Winter Striking (5 °C)
Days to reach the striking strength for winter striking (5 °c) from the strength-gain curve at your site temperature.
The same 50% slab target takes three to four times longer at 5 °C — this variant simply tells the truth about January. Watch the model's assumption that temperature is constant: a frost night can stall hydration entirely while the calendar keeps counting.
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 winter striking (5 °c) 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 — Winter Striking (5 °C)
Formwork Striking Time — Winter Striking (5 °C) 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. The same 50% slab target takes three to four times longer at 5 °C — this variant simply tells the truth about January. Watch the model's assumption that temperature is constant: a frost night can stall hydration entirely while the calendar keeps counting. 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 — Winter Striking (5 °C)
- 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 — Winter Striking (5 °C)?
- ✓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)
- ✓The same 50% slab target takes three to four times longer at 5 °C — this variant simply tells the truth about January.
- ✓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 — winter striking (5 °c) 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?+
The same 50% slab target takes three to four times longer at 5 °C — this variant simply tells the truth about January. 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 winter striking (5 °c) from the strength-gain curve at your site temperature. A free concrete curing, maturity & strength tool. Watch the model's assumption that temperature is constant: a frost night can stall hydration entirely while the calendar keeps counting. 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.
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