Abstract
In some projects where cement is used to stabilize soft soil foundations, it is found that the organic matter influences the stabilization effect. As a consequence, extra admixtures are added to accelerate the reactions of cement and improve the stabilization effect. In this study, different kinds of extra admixtures were used with cement to stabilize a soft soil with a high organic content. Direct shear and unconfined compression tests were undertaken and the mechanical indices in different conditions obtained. The total amount and components of the organic matter in every sample were also determined. The results show that the addition of extra admixtures improves the properties of cement-stabilized soils and that different extra admixtures play a different role.
Résumé
La matière organique a une forte influence sur l’efficacité des traitements au ciment visant à augmenter la résistance des sols. En conséquence, des ajouts de substances particulières sont souvent réalisés pour accélérer/améliorer les processus en cause. Dans cette étude, différents produits ont été ajoutés au ciment pour stabiliser des sols mous contenant une forte teneur en matière organique. Des essais de cisaillement direct et de compression simple ont été réalisés. Les résultats montrent que ces ajouts améliorent les propriétés des mélanges sol-ciment et que leurs effets dépendent du type de sol et de la nature de la matière organique présente. Des suggestions sont faites pour adapter au mieux le type d’ajout en fonction de la nature de la matière organique et de la minéralogie du sol, avec l’objectif d’améliorer la résistance de sols mous.
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Chen, H., Wang, Q. The behaviour of organic matter in the process of soft soil stabilization using cement. Bull Eng Geol Environ 65, 445–448 (2006). https://doi.org/10.1007/s10064-005-0030-1
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DOI: https://doi.org/10.1007/s10064-005-0030-1