Geo-Environmental copmatibility of clay liners

Clay fillers as a base sealing of hazardous waste deposits are vulnerable tointensive attack by different chemical species in/or leachates. The successful designand construction of clay liners must consider tile compatibility of the differentmaterials used in constr ucting clay liners with different chemical species in/orleachates. The impacts of the chemical attack of the clay liners are widely differentand depend upon a multitude of environmental and boundary conditions. Theproblem under study i ” what is the impact,of chemical attack of clay liners on’heir effectiveness, Geotechnically and Environmentally (Geo-Environmentaily)during the liner’s life?”.11,e main objective of this study was to examine the compatibility ofacompacted soil (can be used as a clay liner) with certain chemical species (can befound in leachates). 804-- and Cl- were the chemical species employed in thepresent study. Kaolinite, blended with fine sand (1 : 2 by dry weight), was the soilinvestigated ill this study. Tile laboratory investigating program conducted inthis study, consisted of two main phases:(1) Permeating the prepared soil samples with the selected chemical fluidsindividually using triaxial pressure flexible wall permeameters to simulate thetrue field conditions. Then, measuring the alterations in the soil’s hydraulicconductivity either with concentration of the applied chemical species in thepermeant fluid or with the elapsed time.(2) Investigating the impact of chemical permeation on both the strength propertiesand consolidation characteristics of soil.