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Solidification et stabilisation de REFIOM en matrice cimentaire adjuvantée

Abstract : The aim of this work is to characterize a fly ashes solidification-stabilization process with hydraulic binders. First, new additives were choosen for their capacity to trap the two sorts of pollutants present in wastes : solubles salts and metallic species. After a description of different materials used (wastes, cement, additives). The different stabilized wastes have been leached according to a procedure based on a standard AFNOR x31-210. Samples are studied by optical microscopy, SEM, electron microprobe, elementary analyses in order to control efficiency of pollutants immobilization into CSH phases). The second part deals with time evolution of stabilized products. Two leaching tests have been used to study environmental attacks in short experimental times. First one is a soxhlet and simulates the streaming of pure water on samples. Second one is a batch test where samples are immerged into solutions of different nature (water, solutions doped with complexing agents). Stabilized waste leaching depends on different parameters including time. The simple model of pollutants diffusion through cement matrix is inadequate because precipitations modified quickly solubility and materials porosity. In order to connect hydratation reactions to textural modifications of stabilized wastes during their leaching, 1H NMR is used to complement two methods of porosity envestigation :mercury porosimetry and tomodensitometry. Results show that porosity is decreasing at long term and pollutants lixiviations is more and more limited. Evolution of stabilized wastes involved a more efficient immobilization
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Submitted on : Thursday, March 29, 2018 - 1:41:04 PM
Last modification on : Tuesday, March 2, 2021 - 1:48:33 PM

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  • HAL Id : tel-01752329, version 1



Lise Châtelet. Solidification et stabilisation de REFIOM en matrice cimentaire adjuvantée. Autre. Institut National Polytechnique de Lorraine, 1995. Français. ⟨NNT : 1995INPL113N⟩. ⟨tel-01752329⟩



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