Sustainability and implementation of the Soil-Mixing material.

PAREDES MARINO

Type de document
RAPPORT DE STAGE
Langue
anglais
Auteur
PAREDES MARINO
Résumé / Abstract
The Soil-Mixing is a technique which consists in mixing the soil with a hydraulic binder, in place, in order to improve its mechanical properties. Its economic attractiveness and its low environmental impact have made of this method a competitive alternative to traditional methods of soil reinforcement, retaining structures (temporary or final), foundations and waterproofing works. This study focuses on the implementation of the material and the characterization of its durability, and in this way have a better understanding on the properties of clayey soil-mix materials, how the type of clay affects these properties and to assess potential factors affecting the durability of treated soils, and make a database with the behavior of different types of clays treated with the Deep Mixing Method. Five different types of clays were implemented and a type f sand: Kaolinite Armoricaine, Kaolinite de Provins, Montmorillonite Arvel, Illite Arvel and Illite du Puy, in addition Fontainebleau Sand, used as a proxy. The plan of study to accomplish the objectives encompasses a extensive mechanical characterization of the mixed material to compare the answer to the treatment of the different clays. The cement content used for all the clays was the same and slightly variation of the water content answer to the value of liquid limit of each material. The mechanical categorization was carried out along with with microstructural measurements (XRD, MPI). In parallel, it was determinated the durability of the material by evaluating the action of pollutants or disruptors, as chlorides and sulphates that were introduced in the mixtures. The final coupling of the mechanicals and microstructural studies yield the following results: ' The study of the mechanical behaviour of soil mixed materials demonstrated the importance of the nature of the soil, the cement content and the curing time.' 'The measurements of porosity and XRD give exhibit evidences on the dissolution of the clay phases specially, due to the attack of cement upon them; and on the other hand how the presence of disruptor affect widely the porosity of the sample, being the sulphate the one that reduce the porosity the most, which it is not necessary a bad consequence on mechanical terms. 'The comparison between laboratory and field data done is a bit empirical, since the soil treated are not the same, but eventhought is clear that the values of strength reached by mixtures of natural soil done in situ are lower than the values throw for the mixed prepared in the laboratory, factor that is very important to consider this difference when mixtures on the laboratory are performed, to investigate the effect of different binders on different soils. It was concluded the need of carrying out the microstructural characterization for longer times of curing times, as long as enriched this multiparameter study with new tests as determination of cation exchange capacity (CEC), and controlling on pH conditions.
Editeur
UNIVERSITE DE POITIERS

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