Stabilization of sensitive clays for reuse using a chemical process

Kevin Dumberry, Sylvain Roy, Laurent Samson, Patrick Turgeon

In the proceedings of: GeoEdmonton 2018: 71st Canadian Geotechnical Conference; 13th joint with IAH-CNC

Session: Soil Mechanics and Foundations (Ground Improvement)

ABSTRACT: Champlain Sea clays are known to have high plasticity and sensitivity, making it difficult for them to be reused as construction materials. This experimental study was conducted to verify the effect of adding chemical products, such as quicklime and a lime co-product; i.e., the LKD (Lime Kiln Dust), on the geotechnical behavior of clays. The results show that the addition of those products to the clay increases the consistency limits considerably. A mass percentage of quicklime of 1.6% (3.4% corresponding percentage for the LKD) is optimal for generating pozzolanic reactions and obtaining sufficient trafficability (consistency index > 0.75) for the material to be reused. A significant gain in shear strength of the amended clays was obtained over a 17-day period. The permeability of the mixtures obtained is of the order of 10-7 cm/s.

RÉSUMÉ: Les argiles de la Mer de Champlain sont reconnues pour posséder une plasticité et une sensibilité élevées, rendant difficile leur réutilisation comme matériaux de construction. de produits chimiques, tels que la chaux vive et un coproduit de la chaux, le LKD (Lime Kiln Dust), sur le comportement augmentation des limites de consistance. Un pourcentage massique de chaux vive de 1,6 % (3,4 % pour le LKD) est optimal pour engendrer des réactions pouzzolaniques et obtenir une traficabilité suffisante pour la réutilisation (indice de consistance > 0,75). Un gain significatif de la résistance au cisaillement des argiles amendées a été obtenu sur une période de 17 jours. La perméabilité -7 cm/s.

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