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3 cards from this section. Quick, good the night before a test.
What is the minimum sampling frequency for concrete tests?
Think about how often materials are mixed.
What is the acceptance criterion for individual test results when fck = 30 MPa?
Consider the acceptable range below the characteristic strength.
What is the minimum number of samples required per day according to IS 456:2000?
Consider daily operations during construction.
An average of 31 MPa with a minimum of 27 MPa indicates acceptance based on what criteria?
Think about the rules for averaging test results.
Given test results of 20 MPa, 22 MPa, 24 MPa, and 28 MPa for a concrete mix designed to achieve 25 MPa, determine if the mix should be accepted or rejected.
Check if the average meets the characteristic strength.
You have a concrete mix that yields variable results across several batches. How would you assess the quality and what corrective measures might you implement?
Consider what's causing the variability: materials, mixing, or environmental factors.
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