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

The structure of a sensitive Quebec 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.