Experimental Study on the Influence of the Shape and the Size of the Specimen on Compression Behaviour of High Strength Concrete

  • J. R. Del Viso
  • J. R. Carmona
  • G. Ruiz
Conference paper

Abstract

In this paper we investigate the mechanical behavior of high-strength concrete (around 100 MPa) in compression and tested in strain-control. We are particularly interested in the influence of the shape and the size of the specimens on the compressive strength, fc, of the material. In a previous study [1] we managed to get ductile compressive tests by using small cylinders and by controlling the strain instead of the load. The experiments were tested at four strain rates since the purpose of the research was to check the sensitivity of the whole stress-strain curve to the speed at which the specimen is loaded. Here we address the problem of the effects of the size and the shape of the specimens on their mechanical behavior. We use cylinders and cubes of different sizes: the dimensions of the cylinders are 75 x 150, 100 x 200 and 150 x 300 mm (diameter x height); the edges of the cubes are 33, 50, 66 and 100 mm long. The plane sides of the cylinders and all the cubes were polished to avoid local imperfections and to minimize friction against the loading platens. The standard properties of the material are given in Table 1. By ‘standard’ we mean properties obtained according to well-established procedures, i.e., procedures devised for normal strength concrete. Please, notice that the characteristic length, lch, of this concrete is roughly 150 mm, closely half the lch of normal concrete. This means that, from a Fracture Mechanics standpoint, we expect that high-strength concrete (HSC) is more brittle than NSC for the same specimen size [1, 2, 3, 4].

Keywords

Fatigue Brittle Ductility Cela 

References

  1. 1.
    G. Ruiz, delViso J. R., Carmona J. R., Characterization of the ductility and of the mechanical behaviour at various strain-rates of high-strength concrete (over 100 MPa), 6 Int. Conference Fracture Mechanics of Concrete and Concrete Structures (FraMCoS-6) Catania (Italy). Submitted.Google Scholar
  2. 2.
    Jose Umberto A. Borges, Kolluru V. Subramaniam, W. Jason Weiss, Surendra P. Shah and Túlio N. Bittencourt, Length Effect on Ductility of Concrete in Uniaxial and Flexural Compression, ACI Structural Journal, vol. 101, No. 6, November–December 2004.Google Scholar
  3. 3.
    Shah, S. P., Swartz, S. E., and Ouyang, C. Fracture Mechanics of Concrete. Wiley, New York, 1995.Google Scholar
  4. 4.
    Jansen, D.C., and Shah, S.P., 1997, “Effect of Length on Compressive Strain Softening of Concrete,” Journal of Engineering Mechanics, ASCE, vol. 123, no. 1, pp. 25–35.CrossRefGoogle Scholar

Copyright information

© Springer 2007

Authors and Affiliations

  • J. R. Del Viso
    • 1
  • J. R. Carmona
    • 1
  • G. Ruiz
    • 1
  1. 1.Camilo José Cela s/nCiudad RealSpain

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