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Concrete strength acceptance (running average of three)

ACI 318 · ACI 301 · ASTM C39 · C94
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Concrete strength acceptance (running average of three)

ACI 318 · ACI 301 · ASTM C39 · C94

Checks a run of cylinder strength tests against f′c: every average of three consecutive tests, and every single test against the low-test limit.

Units
Strength tests, in the order they were made
TestCylinder 1, psiCylinder 2, psiCylinder 3, psi
1
2
3
4
5
6
7
8

One row per sample: each cylinder’s strength at the test age (two 6 × 12 in. or three 4 × 8 in.). Leave the third column blank for pairs.

Specification

The low-test limit follows from it: f′c − 500 psi (3.5 MPa) up to 5,000 psi (35 MPa), 0.90 f′c above.

Example values from the acceptable run in NRMCA CIP 9 (f′c 4,000 psi).

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