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1905.1.3 Basis of F'c
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Unless otherwise specified, f'c shall be based on 28-day tests. If other than 28 days, test age for f'c shall be as indicated in construction documents. If at any time during the concrete operations, the concrete is not in conformance with ASTM C 94 or is otherwise compromised, it shall be rejected. If it is placed, the location of the load shall be recorded and a pair of cylinders shall be molded from the load per ASTM C 31 and included in the average f'c.
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