According to California Building Code requirements for concrete testing, what is the minimum frequency for taking compression test specimens during concrete placement?
Correct Answer
C) One set for every 100 cubic yards placed
CBC Section 1905.6.2.4 requires compression test specimens to be taken at a rate of not less than one set for every 100 cubic yards of concrete placed, with at least one set per day. This testing frequency ensures adequate quality control and compliance with specified concrete strength requirements throughout the project.
Why This Is the Correct Answer
CBC Section 1905.6.2.4 requires compression test specimens at a minimum frequency of one set per 100 cubic yards of concrete placed, with at least one set per day of placement. This ensures ongoing quality verification throughout a pour and across the project duration.
Why the Other Options Are Wrong
Option A: One set for every 50 cubic yards placed
One set per 50 cubic yards is twice as frequent as required — it exceeds the minimum and would add unnecessary cost and testing burden. The CBC specifies 100 cubic yards as the threshold.
Option B: One set for every 150 cubic yards placed
One set per 150 cubic yards is less frequent than the 100-cubic-yard minimum requirement and would not meet CBC testing standards. Using this frequency could result in inadequate quality control.
Option D: One set per day of placement
One set per day of placement alone is insufficient as a standalone rule. While the CBC does include a one-set-per-day minimum, the primary frequency requirement is one set per 100 cubic yards. Large pours require more frequent sampling than once daily.
Memory Technique
100 yards, one set — every 100 cubic yards of concrete must be sampled. Think of a football field: 100 yards means time to test. And at minimum, test once per day no matter the volume.
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