Abdel-Mohsen O. Mohamed

Bio: Abdel-Mohsen O. Mohamed is an academic researcher from Zayed University. The author has contributed to research in topics: Soil water & Water content. The author has an hindex of 18, co-authored 100 publications receiving 1512 citations. Previous affiliations of Abdel-Mohsen O. Mohamed include McGill University & United Arab Emirates University.

Principles of Contaminant Transport in Soils

Abstract: Preface. 1. Waste Generation and Disposal. Waste and waste management. Hazardous waste classification. Waste, and its lethality. Regulated, non-regulated waste and 4 R's. Requirements and problems in land disposal. Concluding remarks. 2. Soil Composition. Soil material. Soil surfaces. Electric charge. Soil organics. Concluding remarks. 3. Wastes and Contaminants. Introduction. Hazardous wastes and toxic substances. Sources of wastes. Chemically reactive groups. Contaminant characteristics and properties. Some typical wastes. Concluding remarks. 4. Soil-Water Interaction and Relations. Introduction. Interaction with water. Energies of interaction. Bonding and interactions. Soil-water potential. Water movement in clay soils. Summary and general observations. 5. Contaminant-Soil Interaction. Introduction. Interaction by chemically reactive groups. Contaminant-soil interaction mechanisms. Sorption of contaminants. Sorption by soil constituents. Soil interaction with organic chemicals. Concluding remarks. 6. Soil Permeability: Characteristics and Laboratory Measurements. Introduction. Laboratory methods for permeability testing. Clay soil permeability. Influence of contaminants on clay permeability. Summary and concluding remarks. 7. Evaluation of Adsorption and Diffusion. Introduction. Batch equilibrium and column leaching tests. Selective sequential extraction. Estimation of transport parameters. Field evaluation. Concluding remarks. 8. Contaminant Transport Modelling: Solute Transport. Nature of the problem. Contaminant transport models. Modelling for physico-chemical forces. Calibration and validation of models. Concluding remarks. 9. Contaminant Transport Modelling: Transport of Non-Aqueous Phase Liquids. Introduction. NAPL pathways in substrate soil. NAPL fate and transport. Model development. Concluding remarks. References and Suggested Reading. Index.

Hydro-mechanical behavior of a newly developed sulfur polymer concrete

Abstract: This study has focused on evaluating the durability of the newly manufactured sulfur polymer concrete (SPC) from recycled waste materials such as sulfur (by-product from oil industry), fly ash (recovered from the gases of burning coal during the production of electricity) and desert sand from abundant sand dunes quarries. The first step in such manufacturing process is the sulfur modification using polymeric additives to control sulfur crystallization and to prevent macro-crystals growth. In a controlled temperature surroundings, modified sulfur was mixed with elemental sulfur, fly ash and desert sand to form the newly SPC. The durability of the SPC was evaluated in: de-ionized water, acidic solutions of 20, 40, 70, and 98 wt% H2SO4 solutions, and saline solutions of 0.5, 1, 2, 3, 4, and 5 wt% NaCl, at different temperatures for different periods of time. To compare the SPC results with known material, normal Portland cement concrete (PCC) mortars were also studied. The results indicated that the manufactured SPC material has high compressive strength, low hydraulic conductivity, and high resistance to permeation of water, and particularly resistant to corrosion in acid and salt environments.

A study of particle interaction energies in wetting of unsaturated expensive; clays

Abstract: The results of infiltration (wetting) experiments conducted on expansive soils demonstrate several requirements and constraints to the techniques used for the study of wetting performance of such s...

Extractive Metallurgy of Rare Earths

Abstract: A comprehensive review is presented of the extractive metallurgy of rare earths. The topics covered are: world rare earth resources and production; ore processing and separation of individual rare earths; reduction, refining, and ultrapurification of rare earth elements; methods for rare earth materials analysis; and a selection of the numerous rare earth applications. World rare earth reserves are abundant and would last for well beyond the next century. However, all of the 16 naturally occurring rare earth elements are not equally distributed in the ore minerals. This, compounded with the problems specific to the isolation and recovery of each of the rare earths, sets the stage for an unequal rare earth availability. The close chemical similarity of rare earths looses its importance when divergent physical properties determine the processes for rare earth element reduction and refining. The rare earth metals, alloys, and compounds have been as pure as could be determined. Finally, the commercial...