GATE CE 2023 Set 2 — Question 15
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Question
M20 concrete as per IS 456: 2000 refers to concrete with a design mix having _________________
Correct answer
(C) a 5-percentile cube strength of 20 MPa
Solution
According to IS 456: 2000, the grade of concrete (e.g., M20) is designated based on its characteristic compressive strength (). The characteristic strength is defined as the strength of the material below which not more than 5% of the test results are expected to fall (i.e., the 5th percentile). In the Indian standard, this is determined using cubes tested at 28 days. Thus, M20 refers to concrete with a characteristic (5-percentile) cube strength of .
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