The Effect of Different Mixtures on Desiccation Crack Behaviour and Hydraulic Stability of Compacted Liner

Abstract

Landfill is always equipped with a leachate retaining system (lining system). This layer has low permeability (<10-6 m/s), preventing leachate from entering the soil and causing groundwater and environmental pollution. In this study, composites made from textile industry, added with bentonite, lime, and rice husk ash, were tested to determine their physical ability as a landfill liner. The results showed that the composites with the addition of bentonite to dewatered sludge as much as 40% or more could meet the landfill permeability standards. However, when lime as much as 1%, and rice husk ash as much as 8% were added in the composite, the permeability was reduced. The addition of bentonite tends to increase the cohesion value and decrease the inner shear angle. Meanwhile, the addition of lime and rice husk ash tends to show an increase in the internal shear angle and fluctuating cohesion results.