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Influence de la lyophilisation sur la structure d'une argile sensible du Québec

  • P. Delage (a1) and F. M. Pellerin (a1)

Resume

L' étude de la structure d' une argile sensible du Québec est abordée en porosimétrie au mercure après lyophilisation et en microscopie électronique à balayage sur une surface obtenue par fracture de l' échantillon congelé (système Cryoscan). On observe une structure en agrégats définissant deux classes de pores. A grande vitesse de congélation, la cristallisation de la glace semble surtout affecter les points faibles de la structure, qui sont les ponts de plaquettes reliant les agrégats les uns aux autres.

Abstract

The structure of a sensitive Québec clay was investigated using mercury intrusion porosimetry and scanning electron microscopy on a freeze-fractured sample (Cryoscan apparatus). An aggregated structure containing two pore populations was observed. Ice crystallization appeared to affect preferentially the points of weakness of the structure, which comprised inter-aggregate bridges formed by accumulations of clay platelets.

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Influence de la lyophilisation sur la structure d'une argile sensible du Québec

  • P. Delage (a1) and F. M. Pellerin (a1)

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