alleryStart learning →In a compression test on a concrete cube using a UTM, at what uniform rate is the uniaxial compressive load applied until destruction?
A7 N/mm² per minute
B14 N/mm² per minute
C10 N/mm² per minute
D21 N/mm² per minute
Answer & Solution
Correct answer: B. 14 N/mm² per minute
1. The IS code prescribes a uniform compression rate so strain-rate effects are controlled.
2. For cube testing the rate is 14 N/mm² per minute applied until the specimen crushes.
3. The peak load at crushing divided by the cross-sectional area gives the cube strength.
4. The 7 N/mm² value belongs to flexure (rate of extreme-fibre stress), not cube compression.
5. Rates of 10 or 21 N/mm² per minute are not specified.
_Source: IGNOU ET-522 Concrete Technology, Block 2 Unit 9 "Testing of Concrete"._
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Related questions
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