Plastic Shrinkage Risk — Thin Bonded Topping
ACI 305 evaporation rate for a thin bonded topping with the standard cracking-risk thresholds.
A 50 mm topping has almost no bleed reservoir — its 'safe' threshold sits near 0.5 kg/m²/h, and the base slab sucking water downward doubles the jeopardy. Saturate the substrate first; the calculator only sees the air side of a two-front war.
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.
ACI 305 evaporation rate for a thin bonded topping with the standard cracking-risk thresholds. A free concrete curing, maturity & strength tool — no sign-up, no upload, instant results in your browser.
About Plastic Shrinkage Risk — Thin Bonded Topping
Plastic Shrinkage Risk — Thin Bonded Topping computes the governing relationship E = 5([Tc+18]^2.5 − r[Ta+18]^2.5)(V + 4)×10⁻⁶ [Uno 1998 / ACI 305R] live as you type. A 50 mm topping has almost no bleed reservoir — its 'safe' threshold sits near 0.5 kg/m²/h, and the base slab sucking water downward doubles the jeopardy. Saturate the substrate first; the calculator only sees the air side of a two-front war. 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 Plastic Shrinkage Risk — Thin Bonded Topping
- 1Enter your values — Concrete temperature, Air temperature, Relative humidity, Wind speed (sensible defaults are pre-filled).
- 2Read the live results: Evaporation rate.
- 3Check the "with your numbers" line to see E = 5([Tc+18]^2.5 − r[Ta+18]^2.5)(V + 4)×10⁻⁶ [Uno 1998 / ACI 305R] substituted step by step.
- 4Adjust inputs until the scenario matches yours, then copy or share the result.
Why use Plastic Shrinkage Risk — Thin Bonded Topping?
- ✓Instant, free and private — every calculation runs client-side in your browser; nothing is uploaded
- ✓Built on the stated formula E = 5([Tc+18]^2.5 − r[Ta+18]^2.5)(V + 4)×10⁻⁶ [Uno 1998 / ACI 305R] with authoritative sources cited on the page (ACI 305R — Hot weather concreting; Uno, P.J. (1998), ACI Materials Journal 95(4))
- ✓A 50 mm topping has almost no bleed reservoir — its 'safe' threshold sits near 0.5 kg/m²/h, and the base slab sucking water downward doubles the jeopardy.
- ✓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 plastic shrinkage risk — thin bonded topping use?+
It evaluates E = 5([Tc+18]^2.5 − r[Ta+18]^2.5)(V + 4)×10⁻⁶ [Uno 1998 / ACI 305R], exactly as published. Sources: ACI 305R — Hot weather concreting; Uno, P.J. (1998), ACI Materials Journal 95(4). 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?+
A 50 mm topping has almost no bleed reservoir — its 'safe' threshold sits near 0.5 kg/m²/h, and the base slab sucking water downward doubles the jeopardy. 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?+
ACI 305 evaporation rate for a thin bonded topping with the standard cracking-risk thresholds. A free concrete curing, maturity & strength tool. Saturate the substrate first; the calculator only sees the air side of a two-front war. 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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