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For a test core cut from a structure, the cube-equivalent strength is estimated as cube strength = 1.25 × C1 × C2 × core strength. The factor C2 depends on which property of the core?
Answer & Solution
Correct answer: A.
1. C1 accounts for core strength level and runs from 1.0 to 1.4.
2. C2 is specified in IS 516 and depends on the height-to-diameter ratio of the cut core.
3. When the L/D ratio of the core equals 2, C2 is taken as 1.
4. If the L/D ratio is less than 0.95 the core has to be discarded entirely.
5. Age, cement content and relative diameter are not what C2 corrects for.
_Source: IGNOU ET-522 Concrete Technology, Block 2 Unit 9 "Testing of Concrete"._
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