Abstract
Sand-bentonite (SB) mixtures have been used successfully for construction of hydraulic barriers when clayey soils are not available. Compacted layers of SB mixtures have been proposed and used in a variety of geotechnical structures as engineered barriers for the enhancement of impervious landfill liners. In the practice we will try to get an economical mixture that satisfies the hydraulic and mechanical requirements.The effects of the bentonite additions are reflected in lower water permeability, and acceptable shear strength. In order to get an adequate dune sand bentonite mixtures, an investigation relative to the hydraulic and mechanical behavior is carried out in this study for different mixtures. According to the results obtained, the adequate percentage of bentonite should be between 12% and 15 %, which result in a hydraulic conductivity less than 10E–6 cm/s, and good shear strength.
Highlights
Rapid technological advances and population needs lead to the generation of increasingly hazardous wastes
The dune sand is classified as poorly graded fine sand according to the unified soil classification system (USCS)
In this research study we have shown that it is possible to obtain an adequate mixture intended for insulation barriers, using dune sand and a small amount of bentonite addition
Summary
Rapid technological advances and population needs lead to the generation of increasingly hazardous wastes. One of the actual solutions, for handling these contamination problems, is by enclosing the wastes in a specific location, using insulated barriers. The efficiency of these insulated barriers depends largely on their hydraulic and mechanical behavior along with their capacities of attenuation and retention of the contaminant. Compacted sandy soils with small additions of bentonite, known by sand-bentonite (SB) mixtures, have been proposed and used as an adequate material for these insulation layers. (2015) 2: 10-17 groundwater pollution and environment degradation, an insulation barrier using dune sand, which is an available and economical local material, enhanced by small addition of bentonite is proposed. In searching for an adequate mixture, an investigation study is carried out on several dune sand calcium bentonite mixtures with different percentages of bentonite additions, which varies between 3% and 15%
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