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Influence of autogenous shrinkage on early age behaviour of structural elements consisting of concretes of different ages

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Abstract

In structural elements consisting of concretes of different ages, physical and chemical deformations induced by heat release and autogenous shrinkage during the hydration of new concrete are restrained by the old concrete. Depending on the amplitude of these deformations and on the degree of restraint of the hybrid element, full-depth cracks can be induced in the new concrete layer at an early age. An experimental investigation on four hybrid elements was conducted to study this early age behaviour. The temperature evalution and global strains (measured using optical fiber sensors) during hydration are presented. Comparison of the experimental results with a numerical model shows that autogenous shrinkage has the most important influence on the evolution of the strains and internal stresses in the tested hybrid elements at early age.

Résumé

Lors de la construction d'éléments de structure formés de bétons d'âges différents, les déformations physico-chimiques induites par le dégagement de chaleur et par le retrait endogène au cours de l'hydratation du nouveau béton sont entravées par le vieux béton. En fonction de l'amplitude de ces déformations et du degré d'entrave de la structure hybride, des fissures traversantes peuvent être induites au jeune âge dans la nouvelle couche. Des mesures de température et de déformations globales obtenues à l'aide de capteurs à fibres optiques durant l'hydratation de la nouvelle couche de quatre éléments hybrides sont présentées. Lors de la validation de la modélisation numérique proposée, l'influence prépondérante du retrait endogène sur l'évolution des déformations et des autocontraintes induites dans les éléments hybrides testés a pu être confirmée.

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Authors and Affiliations

  1. Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, Cambridge, USA

    O. Bernard

  2. OXAND, Ingénierie et Technologie, Montigny sur Loing, France

    O. Bernard

  3. Department of Civil Engineering, Swiss Federal Institute of Technology, Lausanne, Switzerland

    E. Brühwiler

Authors
  1. O. Bernard
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  2. E. Brühwiler
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Additional information

Editorial Note Dr. Olivier Bernard is a RILEM Affiliate Member. He participates in RILEM TC 181-EAS ‘Early age shrinkage induced stresses and cracking in cementitious systems’. Prof. Eugen Brühwiler is a RILEM Senior Member and Staff Member. He works at EPFL, a RILEM Titular Member and participates as a corresponding member in RILEM TC NEC ‘Non-destructive evaluation of the “covercrete” (concrete cover)’.

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Bernard, O., Brühwiler, E. Influence of autogenous shrinkage on early age behaviour of structural elements consisting of concretes of different ages. Mat. Struct. 35, 550–556 (2002). https://doi.org/10.1007/BF02483123

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  • DOI: https://doi.org/10.1007/BF02483123

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