Concrete maturity: temperature-time factor, equivalent age and strength

ASTM C1074 · Tex-426-A

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Concrete maturity: temperature-time factor, equivalent age and strength

ASTM C1074 · Tex-426-A

Temperature-time factor (Nurse-Saul) or equivalent age (Arrhenius) from a temperature record, and the in-place strength from your mix’s strength-maturity curve.

Units US customary SI (metric)

Maturity

Maturity function

Temperature record
Reading	Age, h	Temperature, °F
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8

Hours since placing and the concrete temperature at the sensor, in time order.

Datum temperature, T₀, °F

FHWA gives −10 °C (14 °F) as the usual value; C1074 explains how to find a mix’s own.

Strength-maturity relationship

Strength-maturity calibration
Break	Temperature-time factor, °F·h	Strength, psi
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The average strength of each set of calibration specimens and its maturity when broken. Leave blank for maturity only.

Specification

Strength needed (opening, form removal), psi (optional)

Optional. The agency’s opening strength, for example.

Minimum R² of the calibration fit (optional)

Tex-426-A requires at least 0.90.

Example values only. A strength-maturity curve belongs to one mix: build your own from calibration breaks.

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