Rheological properties of cement-stabilised kaolin
Résumé
Deep soil mixing is a process used to improve the mechanical properties of soft soils by mixing dry or wet binders with the existing soil. The strength and deformation properties of the treated soils depend on the initial soil conditions, the type and amount of binder used and the curing conditions. The homogeneity and strength of soils stabilised by deep mixing also depend on the mixing mechanisms that occur during construction. These mixing mechanisms are directly related to the rheological properties of the materials being mixed. Therefore, rheology is the starting point in understanding the processes involved in deep soil mixing although knowledge of the rheological characteristics of stabilised clays is very limited. The aim of the research presented in this paper is to investigate the effects of cement stabilisation on the rheological properties of kaolin clay. The flow properties of kaolin, cement slurries and kaolin–cement mixtures at various moisture contents were measured using a rheometer with two different geometries:
parallel plates and the ball measuring system. For all mixtures tested, the shear stresses increase as the moisture content decreases. A good agreement was found between the stresses measured using the parallel plates and the ball measuring system for kaolin suspensions, validating the use of this shear geometry for subsequent studies on coarse grained soils. The results are discussed with respect to in situ soil mixing processes. It is proposed that observations made in the field on the relation between blade rotation speed and strength and homogeneity of treated soils can be explained by the shear-thinning behaviour of clays. The yield stress may be a relevant tool to study the workability of soil-cement mixtures.
Domaines
Sciences de l'ingénieur [physics]
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2012-guimond-barrett-touati-pantet-reiffsteck-le-kouby-rheological-property-cement-kaolin.pdf (380.02 Ko)
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