Plastic Shrinkage Risk — Fogging System Trigger
ACI 305 evaporation rate for a fogging system trigger with the standard cracking-risk thresholds.
Fog nozzles don't cool — they raise the local RH until the air above the slab can't take more water. This variant is the go/no-go arithmetic: when the rate passes 1.0 (or 0.5 for low-bleed mixes), fogging or an evaporation retarder stops being optional.
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 fogging system trigger 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 — Fogging System Trigger
Plastic Shrinkage Risk — Fogging System Trigger 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. Fog nozzles don't cool — they raise the local RH until the air above the slab can't take more water. This variant is the go/no-go arithmetic: when the rate passes 1.0 (or 0.5 for low-bleed mixes), fogging or an evaporation retarder stops being optional. 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 — Fogging System Trigger
- 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 — Fogging System Trigger?
- ✓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))
- ✓Fog nozzles don't cool — they raise the local RH until the air above the slab can't take more water.
- ✓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 — fogging system trigger 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?+
Fog nozzles don't cool — they raise the local RH until the air above the slab can't take more water. 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 fogging system trigger with the standard cracking-risk thresholds. A free concrete curing, maturity & strength tool. This variant is the go/no-go arithmetic: when the rate passes 1.0 (or 0.5 for low-bleed mixes), fogging or an evaporation retarder stops being optional. 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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