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In carrying out compression test for concrete, should test cubes or test cylinders be adopted?

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Basically, the results of compression test carried out by using cubes are higher than that by cylinders. In compression test, the failure mode is in the form of tensile splitting induced by uniaxial compression.

However, since the concrete samples tend to expand laterally under compression, the friction developed at the concrete-machine interface generates forces which apparently increase the compressive strength of concrete. However, when the ratio of height to width of sample increases, the effect of shear on compressive strength becomes smaller. This explains why the results of compression test by cylinders are lower than that of cubes. Reference is made to Longman Scientific and Technical (1987).

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This question is taken from book named – A Self Learning Manual – Mastering Different Fields of Civil Engineering Works (VC-Q-A-Method) by Vincent T. H. CHU.

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Comments
  • Femi ologbonyo September 16, 2010 at 7:56 am

    Sir, i realy appreciate the importance of this site. Pls, i want to know about the cube test to determine concrete strenght. Can you send me the complete procedure with a sample

  • J.C.Sharma May 19, 2016 at 3:15 am

    Sir, I am very happy to study content of this site. Pls. tell me in detail acceptance criteria as new amendment in IS 456.Complete procedure of cube testing. Complete procedure to determine flexural strength of concrete
    Pls. tell us heat of hydration of OPC.

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