Question by Govinda D: why we mostly use cylinder and cubes for compressive strength test of concrete?what happen if prism is used?
please wite me about the size effect of testing specimen on its compessive strength.
Answer by Darwin
PRISMS -which we would better call as pyramids, is impractical to use as concrete specimens for testing, because it has no regular cross-section along an axis.
and furthermore, the manufacture of pyramidal concrete specimens is tedious work.. unlike cylinders and cubes.
about the ‘size-effect’ ;it is an ‘unheard-of’ animal in engineering jargon.
testing a concrete specimen for compressive strength is simply applying a specific stress along the centroidal axis of the object under testing.. if the specimen does not fail under such required stress.. it is considered ‘passed’ …a specimen taken from a concrete mixture with the incorrect proportions of ‘cement and aggregates’ is bound to fail this test.
What do you think? Answer below!