As per IS 456:2000, the minimum number of samples of concrete to be taken per day's pour for a structure is:
Choose the correct answer
1 sample per 5 m³ — no minimum frequency
1 sample per 50 m³ but not less than 4 samples per day of pour
2 samples per day regardless of volume
1 sample per batch regardless of volume
Correct Answer
B. 1 sample per 50 m³ but not less than 4 samples per day of pour
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IS 456:2000 Cl. 15.2.2: Minimum frequency of sampling = 1 sample per 50 m³ or per day of pour, whichever requires more samples, but not less than 4 samples for a day's pour when volume > 30 m³. Each sample = 3 cubes (tested at 7 days, 28 days). This ensures statistical validity.
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