Freezing Induced Bulk Volume Changes in Compacted Clay Soils

Daryl F. Dagesse

In the proceedings of: GEO2010 Calgary: 63rd Canadian Geotechnical Conference & 6th Canadian Permafrost Conference

Session: M1-B

ABSTRACT: Overall soil shrinkage may occur during the freezing of non-rigid clay soils if the air filled pore volume is sufficient to accommodate ice growth. Bulk soil volume change was measured for seven soils, with clay contents ranging from 0.11 kg kg-1 to 0.75 kg kg-1, and frozen at water contents of 10% to 95% saturation. Polynomial curve fitting revealed zones dominated by volumetric decreases and maximum shrinkage at water contents of 63% to 70% saturation, zero volume change at percent saturations of 74% to 90% and expansion at water contents above this level.

RÉSUMÉ: Dans l'ensemble, la contraction du sol peut survenir pendant le gel des sols argileux non rigides si le volume d'air des pores est suffisant pour contenir l'élargissement de la glace. La modification du volume brut du sol a été calculée pour sept sols dont les teneurs en argile oscillent entre 0,11 kg kg-1 et 0,75 kg kg-1 et congelés à des teneurs d'eau variant entre 10% et 95% de saturation. La courbe polynomiale adaptée a révélé des zones dominées par des diminutions volumétriques et un rétrécissement maximum en teneur d'eau de 63% à 70% de saturation, un volume de changement nul à des pourcentages de saturation de 74% à 90% et une expansion à des pourcentages de saturation supérieurs à ce niveau.

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