After low cylinder results for a 5,000 psi member, three cores are evaluated under ACI 318-19 Section 26.12.6.1(e). Which option states its paired minimum strength criterion for the represented area?
Correct Answer
D) Average at least 85% of f'c, with no core below 75%
The stated pair is a three-core average of at least 85% of specified strength with no core below 75%. For 5,000 psi, those nominal thresholds are 4,250 and 3,750 psi. All cores reaching 5,000 psi would also satisfy this strength criterion, but that is not the stated minimum pair. One strong core cannot establish both conditions. Source: https://ascconline.org/Portals/ASCC/Compressive-strength-of-cores.pdf
Why This Is the Correct Answer
The stated pair is a three-core average of at least 85% of specified strength with no core below 75%. For 5,000 psi, those nominal thresholds are 4,250 and 3,750 psi. All cores reaching 5,000 psi would also satisfy this strength criterion, but that is not the stated minimum pair. One strong core cannot establish both conditions. Source: https://ascconline.org/Portals/ASCC/Compressive-strength-of-cores.pdf
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