Materials and Structures

, Volume 32, Issue 5, pp 383–387 | Cite as

Tensile creep behavior of high strength concretes at early ages

  • K. Kolver
  • S. Igarashi
  • A. Bentur
Scientific Reports

Abstract

Early age tensile creep of high strength concrete loaded during the first day after casting was studied. The effect of silica fume was evaluated, using two types of loading scheme: (i) creep which occurs in a restrained autogenous shrinkage test and (ii) creep measured in a conventional test under constant load. The two methods showed that the addition of silica fume increased the early age tensile creep of high strength concrete, when compared to concrete without silica fume but with similar water/binder ratio. This enhanced creep is of practical significance as it provides a mechanism to relieve some of the restraining stress that develops due to autogenous shrinkage.

Keywords

Silica Fume Creep Strain High Strength Concrete Plain Concrete Autogenous Shrinkage 

Résumé

Dans cet article, on a étudié le fluage en traction d'un béton de haute résistance, pendant le premier jour suivant sa fabrication. On a caractérisé l'effet de la fumée de silice, à partir de deux modes de chargement: (1) fluage dans le cas d'un essai en retrait intrinsèque empêché et (2) fluage mesuré dans un essai conventionnel sous charge constante.

Les deux méthodes indiquent que l'addition de fumée de silice augmente le fluage initial d'un béton de haute résistance, par rapport à celui d'un béton de même rapport eau/liant sans fumée de silice. Cette augmentation du fluage est d'une signification pratique, en fournissant un mécanisme qui compense en partie les contraintes générées par le retrait intrinsèque.

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References

  1. [1]
    Igarashi, S., Bentur, A. and Kovler, K., ‘Autogenous shrinkage and induced restraining stresses in high strength concretes’, submitted for publication.Google Scholar
  2. [2]
    Igarashi, S., Bentur, A. and Kovler, K., ‘Stresses and creep relaxation induced in restrained autogenous shrinkage of high strength pastes and concretes’, submitted for publication.Google Scholar
  3. [3]
    Bissonnette, B. and Pigeon, M., ‘Tensile creep at early ages of ordinary silica fume and fiber reinforced concretes’,Cem. Concr. Res. 25 (5) (1995) 1075–1085.CrossRefGoogle Scholar
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    Altoubat, S. A. and Lange, D. A., ‘Early age shrinkage and creep of fiber reinforced concrete for airfield pavement’, in Proc. Conf. Aircraft/Pavement Technology, F. Hermann, editor (American Society of Civil Engineers, USA 1997) 229–243.Google Scholar
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    Kovler, K., ‘Testing system for determining the mechanical behavior of early age concrete under restrained and free uniaxial shrinkage’,Mat. Struct. 27 (170) (1994) 324–330.CrossRefGoogle Scholar

Copyright information

© RILEM 1999

Authors and Affiliations

  • K. Kolver
    • 1
  • S. Igarashi
    • 1
    • 2
  • A. Bentur
    • 1
  1. 1.National Building Research Institute, Faculty of Civil EngineeringTechnion-Israel Institute of TechnologyHaifaIsrael
  2. 2.National Building Research InstituteIsrael

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