Résumé - Abstract
The sealing layer has a key role in engineered multilayer cover to prevent oxygen diffusion to mine waste, thanks to its high water retention capacity and low hydraulic conductivity, which enable the layer to remain near water saturation and effectively hindering oxygen diffusion. When adequate material is not available for the construction of the sealing layer, improvement of local soil material with a sealing agent is often the only option to produce adequate sealing layer material. Apart from bentonite clay, Green Liquor Dregs (GLD), a waste from the pulp and paper industry, have the ability to reduce the oxygen diffusion when mixed to granular soil, improving the water retention capacity of the blend.
Experience from the development of Till/GLD-blends for the construction of sealing layers is compiled to address issue related to soil amelioration using waste with focus on material variation and quality control. The presentation focuses on the opportunities and challenges for the establishment of a circular system based on reutilization of a waste, herein GLD for improvement of soil’s geotechnical property.