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Caractérisation et quantification des éléments perturbateurs de prise lors du traitement des sols

Abstract : To improve soils with poor mechanical properties, it is possible to use a treatment with lime and/or hydraulic binder. But, in some cases, this type of treatment can be totally ineffective. For example, deleterious chemical compounds in the ground can alter the hardening reactions of the binder. However, except in the case of sulphate, there are few studies dealing with the potential influence of other chemical compounds like, for example, agricultural fertilizers. In this context, the aim of this paper is to characterise the effects of chloride, phosphate, nitrate, and sulphate on soil treatment. A suitable soil for stabilisation was mixed with one deleterious compound at a given concentration, similar to its concentration in a soil. The geotechnical and physicochemical parameters were determined, both for the disturbed and the undisturbed soils, allowing the quantification of the influence of each compound taken separately. The action of each supposed deleterious compound was evaluated by determining the swelling, the diametral compression strength, and the unconfined compression strength. These experiments were supplemented by microstructural, mineralogical, and chemical observations. Such evaluation was performed with two soils, a silt and a sand, and two different hydraulic binders. The results showed that fertilizers tend to lower the mechanical characteristics of the silt, but, the soils are still suitable for soil stabilisation. The study do not evidenced any impact of chloride on the mechanical behaviour of the tested soils. The presence of a given chemical compound at a given concentration in the soil is not sufficient enough to determine the suitability of the soil for a treatment.
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Submitted on : Friday, April 30, 2010 - 1:13:36 PM
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Tangi Le Borgne. Caractérisation et quantification des éléments perturbateurs de prise lors du traitement des sols. Sciences de l'ingénieur [physics]. Institut National Polytechnique de Lorraine, 2010. Français. ⟨NNT : 2010INPL002N⟩. ⟨tel-01748817v2⟩

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