In the environment, chromium is mainly found in two oxidation states: Cr(VI) and Cr(III). Cr(VI) is relatively mobile in the environment and is extremely toxic, mutagenic [1,2], teratogenic [3] and carcinogenic [4,5]. In contrast, Cr(III) exhibits relatively low toxicity [6] and is a necessary nutrient for humans and animals [7,8]. Therefore, the reduction of Cr(VI) to Cr(III) is...
Samples of phosphorites from different occurrences of the Kotchari deposits, Burkina Faso, were studied. They are phosphorites that are fine-grained with small quantities of clay. The chemical analyses by XRF indicate a CaO content of 35.98 to 41.33 wt%. and a P2O5 contents of 26.85 to 30.75 wt%.
The XRD patterns shows that the major phases are Carbonate-Fluorapatite (Francolite), ...
We present simulation results of the evolution of stresses and strains in an unsaturated low-swell soil road embankment subjected to hydro-mechanical pressures using the finite element code CODE_BRIGHT. We assume that this bitumen-bearing backfill follows the Barcelona thermo-elasto-plastic model (BBM-TEP). This model describes the thermo-hydro-mechanical (THM) behavior of unsaturated fine...
Atmospheric conditions such as air temperature, wind speed, evapotranspiration, and relative humidity have an influence on the surface soil moisture. This communication presents a modelling of water transfers in unsaturated soil, as well as the numerical simulation of these transfers. The model takes into account the physical and hydrodynamic characteristics of unsaturated soils that interact...
