A slab placement has enough volume to require regular strength testing. Which sampling frequency statement matches ACI 318 for each concrete mixture placed on a day?
Correct Answer
C) At least once per day, once for each 150 yd3, and once for each 5000 ft2 of slab or wall surface area
ACI 318-19 26.12.2.1 uses the most restrictive of the listed frequency checks: at least once per day, at least once for each 150 yd3, and at least once for each 5000 ft2 of slab or wall surface area. Other choices: 500 yd3 is too loose, start/end sampling alone misses the volume and area triggers, and slump does not replace strength-test frequency.
Why This Is the Correct Answer
ACI 318-19 26.12.2.1 uses the most restrictive of the listed frequency checks: at least once per day, at least once for each 150 yd3, and at least once for each 5000 ft2 of slab or wall surface area. Other choices: 500 yd3 is too loose, start/end sampling alone misses the volume and area triggers, and slump does not replace strength-test frequency.
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