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Influence of temperature and composition upon drying of concretes

type de publication      communication internationale avec actes publiés
date de publication 23-05-2010
auteur(s) Brue Flore; Liang Yue; Burlion Nicolas; Skoczylas Frédéric; Bourbon Xavier; Camps Guillaume
  
conférence 7th International Conference on Fracture Mechanics of Concrete and Concrete Structures, FraMCoS-7
     dates de 23-05-2010 à 27-05-2010
     lieu Seoul, South Korea
     nom des actes Proceedings of the International Conference on on Fracture Mechanics of Concrete and Concrete Structures FRAMCOS7, Edited by B. H. Oh et al.
  
pages 745 – 750
ISBN / ISSN 978-89-5708-181-5
résumé The French long-term repository for intermediate level/long lived nuclear wastes consists in a network of underground concrete tunnels in deep geological medium. Various loadings will occur during the repository service-life. Among the physical constraints, especially de-saturation/re-saturation processes, pore pressure variations and temperature changes will affect the concrete properties. The de-saturation process is linked to relative humidity decreases, and in relation to temperature variations. De-saturation leads to shrink-age strains that often induce micro-cracking. Micro-cracks can increase the concrete permeability and decrease the mechanical properties. This experimental study focuses on the drying process and its consequences. The studied materials are concretes, based on CEM I or CEM V/A-type cements. The influence of temperature and cement composition upon drying shrinkage is shown to be important. Due to this, transport properties depend on cement composition. An increase in temperature of up to 80°C accelerates drying mechanisms by means of thermal activation.
mots clés drying shrinkage, temperature, relative humidity, desaturation
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