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A micromechanical approach to ASR-induced damage in concrete

type de publication      communication internationale avec actes publiés
date de publication 2005
auteur(s) Lemarchand Eric; Dormieux Luc; Fairbairn Eduardo
  
conférence Third Biot Conference on Poromechanics
     dates de 24-05-2005 à 27-05-2005
     lieu University of Oklahoma, Norman, Oklahoma, USA
     nom des actes Poromechanics III, Proceedings of the 3rd Biot Conference on Poromechanics, Balkema Publishers
  
pages 821 – 826
ISBN / ISSN 04-1538-041-3
résumé The alkali-silica reaction takes place in the microstructure of concrete. In the presence of hydroxyl ions, the poorly cristallized silica of the aggregates dissolves into the pore water where it combines with alkali coming from the cement paste. The product is a gel that progressively fills a part of the available pore space and is responsible for swelling and microcracking. The present paper aims at modelling this chemically-induced damage in a micromechanical framework. Special attention is devoted to the effect of macroscopic stresses on the development of microcracks at the interface between aggregates and cement paste. For a given crack family, a micromechanics estimate of the driving force of crack propagation is derived as a function of the principal stresses and of their orientation. This allows to predict the damage rate and the evolution of the material stiffness.
mots clés Alkali-Silica Reaction, Micromechanics, Concrete, Damage
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