Concrete Maturity — Post-Tension Stressing
Nurse-Saul maturity index (°C·h) for a post-tension stressing against a required threshold.
Stressing tendons too early crushes anchorage zones — PT specs demand a verified in-place strength (often 20–25 MPa) before the jacks arrive. Maturity sensors at the anchorages, not midspan, govern: that local concrete is what the wedge plate bears on.
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.
Nurse-Saul maturity index (°C·h) for a post-tension stressing against a required threshold. A free concrete curing, maturity & strength tool — no sign-up, no upload, instant results in your browser.
About Concrete Maturity — Post-Tension Stressing
Concrete Maturity — Post-Tension Stressing computes the governing relationship M = Σ (T − T₀) · Δt [Nurse-Saul, ASTM C1074] live as you type. Stressing tendons too early crushes anchorage zones — PT specs demand a verified in-place strength (often 20–25 MPa) before the jacks arrive. Maturity sensors at the anchorages, not midspan, govern: that local concrete is what the wedge plate bears on. 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 Concrete Maturity — Post-Tension Stressing
- 1Enter your values — Average concrete temperature, Datum temperature T₀, Elapsed time, Required maturity (sensible defaults are pre-filled).
- 2Read the live results: Maturity index, Share of requirement, Hours remaining at this temp.
- 3Check the "with your numbers" line to see M = Σ (T − T₀) · Δt [Nurse-Saul, ASTM C1074] substituted step by step.
- 4Adjust inputs until the scenario matches yours, then copy or share the result.
Why use Concrete Maturity — Post-Tension Stressing?
- ✓Instant, free and private — every calculation runs client-side in your browser; nothing is uploaded
- ✓Built on the stated formula M = Σ (T − T₀) · Δt [Nurse-Saul, ASTM C1074] with authoritative sources cited on the page (ASTM C1074 — Estimating concrete strength by the maturity method; Neville, A.M., Properties of Concrete, 5th ed.)
- ✓Stressing tendons too early crushes anchorage zones — PT specs demand a verified in-place strength (often 20–25 MPa) before the jacks arrive.
- ✓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 concrete maturity — post-tension stressing use?+
It evaluates M = Σ (T − T₀) · Δt [Nurse-Saul, ASTM C1074], exactly as published. Sources: ASTM C1074 — Estimating concrete strength by the maturity method; 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?+
Stressing tendons too early crushes anchorage zones — PT specs demand a verified in-place strength (often 20–25 MPa) before the jacks arrive. 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?+
Nurse-Saul maturity index (°C·h) for a post-tension stressing against a required threshold. A free concrete curing, maturity & strength tool. Maturity sensors at the anchorages, not midspan, govern: that local concrete is what the wedge plate bears on. 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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