alleryStart learning →For a concrete with cube strength of 30 N/mm², the ratio of cylinder strength to cube strength is reported as:
A0.50
B0.91
C0.76
D1.00
Answer & Solution
Correct answer: B. 0.91
1. The cylinder/cube ratio rises with concrete strength.
2. At 15 N/mm² cube strength the ratio is about 0.76.
3. At 30 N/mm² cube strength the ratio reaches 0.91.
4. Within the normal working range the average ratio used is 0.80.
5. A ratio of 1.00 would imply identical cube and cylinder strengths, which is not observed.
_Source: IGNOU ET-522 Concrete Technology, Block 2 Unit 9 "Testing of Concrete"._
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