Effect of weathering cycles on strength and swell potential of fly ash stabilized expansive soil subbases

Sazzad Bin-Shafique, Ireen Azfar, K. Rahman

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

Session: W3-C

ABSTRACT: An experimental study was conducted to investigate the effect of weathering cycles on the performance of fly ash stabilized expansive soil subbases. Specimens prepared from two high plasticity expansive clay soils were subjected to 36 wet-dry cycles (with tap water and saline water) and 36 freeze-thaw cycles (good drainage and poor drainage) in a laboratory controlled environment to simulate the weathering action. The detrimental effect of wet-dry cycles on stabilized soils is less significant compared to that of freeze-thaw cycles. The swell potential of stabilized expansive soils increased significantly with poor drainage condition due to freeze-thaw cycles. The vertical swell increases rapidly for first four to five cycles and then increases very slowly.

RÉSUMÉ: Une étude expérimentale a été menée pour étudier les effets des cycles météorologiques sur la performance des sols expansifs sous-bases stabilisés par des cendres volantes. Des spécimens préparés à partir de deux sols argileux à haute plasticité expansive ont été soumis à 36 cycles humides-secs (avec de l'eau du robinet et de l'eau salée) et 36 cycles gel-dégel (bon drainage et mauvais drainage) dans un environnement contrôlé de laboratoire pour simuler l'action météorologique. L'effet des cycles humides-secs sur les sols stabilisés est moins significatif comparé aux cycles gel-dégel. Le gonflement potentiel des sols expansifs stabilisés croît significativement avec les conditions de mauvais drainage causé par les cycles gel-dégel. Le gonflement vertical augmente rapidement lors des 4 à 5 premiers cycles puis ne s'accroît plus que très lentement.

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