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1905.6.3.3 Acceptance of Results
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The strength level of an individual class of concrete shall be considered satisfactory if both of the following requirements are met:
- Every arithmetic average of any three consecutive strength tests equals or exceeds f'c.
- No individual strength test (average of two cylinders) falls below f' c by more than 500 psi (3.45 MPa) when f'c is 5,000 psi (34. 50 MPa) or less, or by more than 0.10 f'c when f'c is more than 5,000 psi (34.50 MPa).
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