1905.6.3.4 Evaluation of results.
BC § 1905.6.3.4
The strength level of an individual class of concrete shall be considered satisfactory if both of the following requirements are met: 1. Every arithmetic average of any three consecutive strength tests equals or exceeds f 'c .
2.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).













