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In-pore tensile stress by drying-induced capillary bridges inside porous materials


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Bouzid M., Mercury L., Lassin A., Matray J.-M., Azaroual M. : “In-pore tensile stress by drying-induced capillary bridges inside porous materials.” Journal of Colloid and Interface Science 355 (2011) 494-502

Type de document > *Article de revue

Mots clés > zone non saturée, eau porale, eaux souterraines, comportement poromécanique

Unité de recherche > IRSN/DEI/SARG/LR2S

Auteurs > MERCURY L., MATRAY Jean-Michel, LASSIN A., BOUZID Majda, AZAROUAL M.

Date de publication > 17/12/2010

Résumé

We present here some evidences that capillary liquid bridges are able to deform micrometric cylindrical pores by tensile stress. Brine-soaked filter membranes are submitted to drying conditions leading to NaCl precipitation inside the 5–10 μm pores. A close examination demonstrated that two forms of NaCl crystallites are successively generated. First, primary cubic crystals grow, driven by the permanent evaporation. When this angular primary solid gets near the pore wall, while the evaporation makes the pore volume to be partly invaded by air, capillary liquid can bridge the now-small gap between the halite angles and the pore wall. In a second step, these small capillary bridges are frozen by a secondary precipitation event of concave-shaped NaCl. The proposed interpretation is that the liquid capillary bridges deform the host matrix of the membrane, and the situation is fossilized by the growth of solid capillary bridges. A quantitative interpretation is proposed and the consequences towards the natural media outlined.