NV C-5 Concrete Practice Questions - Nevada C-5 Concrete Contractor Examination Exam

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Three ASTM C42 cores from a questioned 4000 psi wall test at 3480, 3360, and 3510 psi. Using ACI 318-14 26.12.6.1, what is the correct evaluation?

Fail — every core is below 4000 psi Fail — the lowest core is below 0.75 f'c Pass — the average is 3450 psi (≥ 0.85 f'c = 3400 psi) and the lowest core is 3360 psi (≥ 0.75 f'c = 3000 psi) Pass only if a fourth core reaches 4000 psi

Correct Answer:

Pass — the average is 3450 psi (≥ 0.85 f'c = 3400 psi) and the lowest core is 3360 psi (≥ 0.75 f'c = 3000 psi)

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