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For a 6000 psi concrete mixture, the superintendent checks the low-test limit in the ACI acceptance criteria. Ignoring the three-test average for a moment, which individual test value is the minimum allowed by that branch?

Correct Answer

C) 5400 psi

ACI 318-19 26.12.3.1 uses a 0.10 f'c limit for specified strengths greater than 5000 psi, so a 6000 psi mix may not have an individual strength test below 5400 psi by that branch. Other choices: 5000 psi and 5200 psi are too low, while 5700 psi is stricter than the ACI 10 percent allowance.

Answer Options
A
5000 psi
B
5200 psi
C
5400 psi
D
5700 psi

Why This Is the Correct Answer

ACI 318-19 26.12.3.1 uses a 0.10 f'c limit for specified strengths greater than 5000 psi, so a 6000 psi mix may not have an individual strength test below 5400 psi by that branch. Other choices: 5000 psi and 5200 psi are too low, while 5700 psi is stricter than the ACI 10 percent allowance.

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