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Theses

Dessalement de matériaux poreux modèles par la méthode des compresses

Abstract : Poultices, wet adhesive pastes applied to porous materials to draw out salts, are used in the in situ conservation of built heritage. This study aims to better understand the mechanisms of water and ion transport during desalination to improve its efficiency. Sodium chloride crystallization in laboratory-made model porous samples (sintered glass beads) was carried out to master the artificial salting process. Poultices made of kaolin, cellulose, aggregates, and water were characterized to investigate the relationship between their formulation and their properties. Finally, desalination experiments were conducted. Nuclear magnetic resonance imaging was used throughout the studies to obtain the spatial distribution of water in the different elements non-destructively. Desalination efficiency is related to the system drying behavior which, in turn, depends partly on the material microstructure. Drying of the material before the poultice seems to lead to greater desalination efficiency.
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https://pastel.archives-ouvertes.fr/tel-00494321
Contributor : Elsa Bourguignon <>
Submitted on : Tuesday, June 22, 2010 - 5:18:40 PM
Last modification on : Friday, July 17, 2020 - 5:08:35 PM
Long-term archiving on: : Thursday, December 1, 2016 - 5:51:14 PM

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  • HAL Id : tel-00494321, version 1

Citation

Elsa Bourguignon. Dessalement de matériaux poreux modèles par la méthode des compresses. Matériaux. Ecole des Ponts ParisTech, 2009. Français. ⟨tel-00494321⟩

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