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The individual variation between test strength of sample should not be...

This question belongs to Civil Engineering Concrete Technology And Design Of Concrete Structures
Concrete Technology and Design of Concrete Structures
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The individual variation between test strength of sample should not be more than

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Correct Answer: Option C
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Hoor Pari
Hoor Pari 5 years ago
Concept:

The smaller the size of the cube, the closer to its parent geometry.

Explanation:

For cube test, two types of specimens either cubes of 15 cm × 15 cm × 15 cm or 10 cm × 10 cm × 10 cm depending upon the size of aggregate are used.
For most of the works cubical moulds of size, 15 cm × 15 cm × 15 cm are commonly used.
This concrete is poured into the mould and tempered properly so as not to have any voids.
After 24 hours these moulds are removed and test specimens are put in water for curing.
The top surface of these specimen should be made even and smooth.
This is done by putting cement paste and spreading smoothly on the whole area of the specimen.
As per Clause 15.4 of IS 456-2000, the test results of the sample shall be the average of the strength of three specimens. The individual variation should not be more ± 15% of average than of the average. If more, the test results of the sample are invalid.
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