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A micromechanical analysis of the observed kinetics of ASR-induced swelling in concrete

type de publication      communication internationale avec actes publiés
date de publication 2003
auteur(s) Lemarchand Eric; Dormieux Luc; Kondo Djimédo
  
conférence EURO-C Computational Modelling of Concrete Structures
     dates de 17-03-2003 à 20-03-2003
     lieu Saint Johann im Pongau, Austria
     nom des actes Proceedings of EURO-C 2003
  
ISBN / ISSN 90 5809 536 3
résumé Alkali-Silica Reaction induced macroscopic swelling is one of the leading research activity in Durability Mechanics of concrete structures. This phenomenon, resulting from a chemical reaction occuring in the vicinity of the aggregates, is characterized by the pressurization of a gel filling the porosity directly available. Based on experimental evidences, we consider that the ASR gel is trapped in randomly distributed cracks surrounding aggregates. Therefore, our purpose is to develop a micromechanical approach capable to explain the very first (elastic) part of the observed macroscopic swelling kinetics. For a set of cracks of identical radii, we show that the gel pressure rate is uniform in the saturated cracks when considering an isotropic macroscopic state of stress. Besides, the crucial effect of the kinetics of the filling process on the observed swelling kinetics is emphasized. At last, we study the consequences of an isotropic macroscopic stress on the initial distribution of the cracks. The resulting macroscopic swelling is discussed.
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