Cold-Weather Cooling — Unprotected Slab (What-If)
Concrete temperature vs time for a unprotected slab (what-if) (Newton cooling with hydration offset) against the 5 °C danger line.
The cautionary variant: bare concrete at −5 °C falls through the 5 °C danger line in hours, and fresh concrete that FREEZES before reaching ~3.5 MPa loses up to half its ultimate strength permanently. Run this before deciding blankets are too much trouble.
Formula
Note: Planning estimate only — strength for structural decisions (formwork striking, post-tensioning, loading) must be verified by site-cured specimens or a calibrated maturity system per the project specification.
Concrete temperature vs time for a unprotected slab (what-if) (Newton cooling with hydration offset) against the 5 °C danger line. A free concrete curing, maturity & strength tool — no sign-up, no upload, instant results in your browser.
About Cold-Weather Cooling — Unprotected Slab (What-If)
Cold-Weather Cooling — Unprotected Slab (What-If) computes the governing relationship T(t) = T_eq + (T₀ − T_eq)·e^(−kt), T_eq = T_ambient + ΔT_hydration live as you type. The cautionary variant: bare concrete at −5 °C falls through the 5 °C danger line in hours, and fresh concrete that FREEZES before reaching ~3.5 MPa loses up to half its ultimate strength permanently. Run this before deciding blankets are too much trouble. 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 Cold-Weather Cooling — Unprotected Slab (What-If)
- 1Enter your values — Placement temperature, Ambient temperature, Cooling constant k, Hydration heat offset and more (sensible defaults are pre-filled).
- 2Read the live results: Temperature at horizon, Hours until 5 °C.
- 3Check the "with your numbers" line to see T(t) = T_eq + (T₀ − T_eq)·e^(−kt), T_eq = T_ambient + ΔT_hydration substituted step by step.
- 4Adjust inputs until the scenario matches yours, then copy or share the result.
Why use Cold-Weather Cooling — Unprotected Slab (What-If)?
- ✓Instant, free and private — every calculation runs client-side in your browser; nothing is uploaded
- ✓Built on the stated formula T(t) = T_eq + (T₀ − T_eq)·e^(−kt), T_eq = T_ambient + ΔT_hydration with authoritative sources cited on the page (ACI 306R — Cold weather concreting; Neville, A.M., Properties of Concrete, 5th ed.)
- ✓The cautionary variant: bare concrete at −5 °C falls through the 5 °C danger line in hours, and fresh concrete that FREEZES before reaching ~3.5 MPa loses up to half its ultimate strength permanently.
- ✓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 cold-weather cooling — unprotected slab (what-if) use?+
It evaluates T(t) = T_eq + (T₀ − T_eq)·e^(−kt), T_eq = T_ambient + ΔT_hydration, exactly as published. Sources: ACI 306R — Cold weather concreting; Neville, A.M., Properties of Concrete, 5th ed.. 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 cautionary variant: bare concrete at −5 °C falls through the 5 °C danger line in hours, and fresh concrete that FREEZES before reaching ~3.5 MPa loses up to half its ultimate strength permanently. Planning estimate only — strength for structural decisions (formwork striking, post-tensioning, loading) must be verified by site-cured specimens or a calibrated maturity system per the project specification.
When is this calculator the right tool for the job?+
Concrete temperature vs time for a unprotected slab (what-if) (Newton cooling with hydration offset) against the 5 °C danger line. A free concrete curing, maturity & strength tool. Run this before deciding blankets are too much trouble. 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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