Basée sur les essais préliminaires sous l'effet de l'eau et du lixiviat pour satisfaire les critères de conductivité hydraulique (ksat), de résistance au cisaillement, de résistance à ...
Des essais de consolidation sous des contraintes élevées (jusqu'à 30 MPa) ont été réalisés sur des boues constituées de trois bentonites considérées comme des constituants possibles de barrières ouvragées pour l'entreposage de déchets nucléaires à grande profondeur (Na Kunigel, Na-Ca MX80 Wyoming clay et Ca Fourges clay).
The pellets were prepared for the EB project ( ENRESA, 2005) using a 100-t batch of bentonite extracted in 2001 also from the Cortijo de Archidona deposit. To manufacture the pellets the bentonite was dried and milled in a multi-step process to produce a fine grade powder with a water content of between 3.0 and 4.5%.
Bontoux, J., Rambaud, A. and Reboul, B. (1972) Essais de floculation de sols de bentonite par un polyélectrolyte anionique: Trav. Soc. Pharm. Montpellier 32(1), 51–58. Google Scholar ... Détermination du champ de force de valence et des modes normaux de vibration de l'acétamide: J. Chim. Phys. 71(2), 149–154.
In this study, one-dimensional free swelling tests were conducted on densely compacted GMZ01 bentonite specimens, which has an initial dry density of 1.7 Mg/m 3, with cyclically infiltration of NaCl, CaCl 2 or KCl solution at different concentrations and de-ionized water. Results show that the volume change of the compacted clay could be ...
Bentonite, especially sodium bentonite, is used extensively either by itself or as a component of soil mixtures in many geoenvironmental engineering applications, including the construction of waste-containment barriers. An important aspect of the design of such barriers is the compatibility assessment of the soil barrier with the intended waste. A …
Compacted bentonite and sand–bentonite mixtures are attracting greater attention as buffer material for repositories of high-level nuclear waste. This buffer material is expected to fill up the space between the canisters containing the waste and the surrounding ground by swelling. To produce the specifications, such as dry density, sand–bentonite mass ratio, …
It was also determined that the hydraulic conductivity of 30% ZBM (i.e., 30% bentonite and 70% zeolite) was still higher than that of 10% SBM (i.e., 10% bentonite and 90% sand). The higher hydraulic conductivity of ZBMs with respect to SBMs is attributed to the porous structure of zeolite. Zeolite grains form a network in ZBMs that helps ...
Angiokeratoma. Enlarged capillaries can form angiokeratomas, wart-like bumps, under your skin. The most common type — angiokeratoma of Fordyce — forms red or black bumps on your scrotum or vulva. It may resemble genital warts. Angiokeratomas aren't contagious. Some people opt for treatment if the bumps bleed, cause pain or affect appearance.
The results show that the compaction characteristics were affected by the addition of bentonite, the optimum water content increased and the maximum dry unit weight decreased in the presence of a large amount of bentonite. ... (1998) Sols: Reconnaissance et essais - Détermination de la teneur pondérale en matières …
Ces essais consistent à mesurer la variation de la perméabilité et la rétention des métaux lourds à savoir le cadmium à travers le mélange de sable-6%bentonite. Le but de ces expériences est d'une part mesurer la perméabilité à l'eau, d'autre part, poursuivre, au bout du 15eme jour, l'essai de perméabilité sur les mêmes ...
Principe. La valeur au bleu du sol (VBS) est un essai géotechnique qui permet d'identifier et de classifier un sol selon sa proportion en fines.On utilise le bleu de méthylène car ce colorant a la propriété de se fixer sur la surface spécifique des particules d'un échantillon de sol. Le but de cet essai est donc de mesurer la quantité de bleu adsorbé par les …