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Water retention and gas migration of two high performance concretes after damage

type de publication      communication internationale avec actes publiés
date de publication 05-12-2012
auteur(s) M'Jahad Sofia; Zhang Yao; Davy Catherine A.; Burlion Nicolas; Dubois Thierry; Bourbon Xavier; Talandier Jean; Skoczylas Frédéric
  
conférence conférence internationale PLSE2012 (First International Conference on Performance-Based and Life Cycle Structural Engineering)
     dates de 05-12-2012 à 07-12-2012
     lieu Hong Kong, Chine
     nom des actes Actes de la conférence internationale PLSE2012 (First International Conference on Performance-Based and Life Cycle Structural Engineering)
  
  Sous presse
résumé In the context of long term repository of high-level and long-lived nuclear waste, the aim of this study is to investigate the gas migration properties (gas breakthrough pressure), water retention curves and gas permeability of two Andra concretes (based on CEMI or CEMV-type cements), before and after a dedicated damage procedure aimed at micro-cracking them. Gas breakthrough pressures (GBP) are assessed rather than gas entry, by accurately measuring gas presence on the downstream side of a confined sample subjected to slowly increasing gas pressure on its upstream side. Prior to this, concrete is damaged first by several successive freeze/thawing cycles (-18/+18°C). For three different batches, the initial concrete microstructure is assessed by MIP and SEM observations: nanometric pores are predominant to explain water retention and gas transport properties. It is shown that concrete damage affects significantly water retention curves and gas breakthrough pressures, yet it has no effect on the relationship between relative gas permeability vs. water saturation. Also, for low damage levels, gas breakthrough measurements detect concrete damage, where gas permeability does not.
mots clés High performance concrete, microstructure, durability, permeability, water retention, gas breakthrough.
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