Some Factors Influencing Effect of Core Diameter on Measured Concrete Compressive Strength

This paper presents research on concrete mixtures that are produced using crushed limestone and river gravels having four different maximum sizes, including 10, 15, 22, and 30 mm (or 0.39, 0.59, 0.87, and 1.18 in., respectively). The research investigates the 28-day cube strength of these concrete mixtures, ranging between 28 and 43 MPa (4061 and 6236.6 psi). Compressive strength tests are performed on 2268 core and cube specimens as they age—at 7, 28, and 90 days—along with tests to determine the effect of core diameter on concrete core strength. Strength correction factors are also considered, with results showing that maximum aggregate size increases as core strength decreases. As a consequence, correction factors increase. The authors observe that correction factors are measurably higher for cores that are drilled from river gravel concrete. And in smaller diameter cores, a more pronounced effect is observed, both for correction factors and for results observed in length-to-diameter ratio tests. Another significant observation concerns the age of the concrete, which affects strength correction in different diameter cores. As concrete ages, it has a lower correction factor. However, the authors note that pitting the age of materials against their correction factor is difficult to achieve on a practical level.

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  • Authors:
    • Arioz, Omer
    • Ramyar, Kambiz
    • Tuncan, Mustafa
    • Tuncan, Ahmet
    • Cil, Ismail
  • Publication Date: 2007-5

Language

  • English

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Filing Info

  • Accession Number: 01053983
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jul 11 2007 7:14AM