If a concrete specimen is tested to failure in compression and the machine allows the longitudinal strain in the specimen to be non-uniform over the cross-section of the specimen at its maximum load, then that load is lower than it would be if the strains were uniform. This article reports on an experimental study on the magnitude of the effect of non-uniform straining on apparent concrete strength, showing how it varies for low, medium, and high strength concrete. Measurements of distance between the loading platens of a compression testing machine can be used to determine the extent to which it non-uniformly strains its specimens. Simple theoretical modeling is shown to reproduce the measured results well. The authors note that the correlation between the theory presented and the test measurements is better for normal strength concrete than for high strength concrete. The authors conclude that the effect of non-uniform straining on a concrete specimen's strength can be either prevented by manufacturing testing machines that are adequately stiff in response to an eccentric reaction from the specimen; or compensated for, after measuring strains during the test.

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  • Corporate Authors:

    ASTM International

    100 Barr Harbor Drive
    West Conshohocken, PA  United States  19428-2959
  • Authors:
    • Luker, I
    • Tabsh, S W
  • Publication Date: 2003-12


  • English

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  • Accession Number: 00986555
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Feb 22 2005 12:00AM