Abstract
An important component of modern landfills is the liner system for the prevention of leachate contamination of surrounding ground. Among landfill liner systems, geosynthetic clay liner (GCL) has gained widespread popularity across the world because of its lower hydraulic conductivity as well as its ability to self-heal local damage, which is almost unavoidable in the field. Over the past few decades, numerous studies have been conducted to examine the performance of GCLs, particularly in regard to hydraulic conductivity, chemical compatibility, water-swelling, self-healing capacity, diffusion characteristics, gas migration, and mechanical behavior. In this paper, a brief introduction on modern GCL products is firstly given. Subsequently, the main findings of previous publications on the critical properties influencing the long-term performance of GCLs are summarized in a comprehensive manner. Finally, further research perspectives on polymer-treated GCLs are presented. This paper provides general insights that help readers gain a state-of-the-art overview of GCLs and trends for future development.
Highlights
Solid waste, which includes waste generated from mining, industrial and agricultural operations, urban construction [1,2,3], and community activities, commonly contains a variety of contaminants that may pose significant hazards to public health and the environment
Compared with GM sheared against normal geotextiles, what makes the geosynthetic clay liner (GCL)-GM interface specific is the presence of extruded bentonite, which can significantly reduce interface friction [23,24,110]
Due to the low hydraulic conductivity and high swelling potential, a macromolecule resin in GCL as a substituted material of bentonite has been explored in Japan
Summary
Solid waste, which includes waste generated from mining, industrial and agricultural operations, urban construction [1,2,3], and community activities, commonly contains a variety of contaminants that may pose significant hazards to public health and the environment. Over the past three decades, extensive studies have been conducted on the physical and mechanical mechanical properties of GCL and/or bentonite-based barriers in geoenvironmental applications [22–. (e.g., due heap to theleach increased application of GCLhave materials in miningtoand industrial processes pads etc.), many studies been conducted investigate theprocesses effect of (e.g., heaptoleach padsenvironments etc.), many studies have been(i.e., conducted to cold, investigate the heat, effecthyper-salinity, of exposure to exposure extreme and conditions excessive excessive extreme environments and conditions cold, heat, hyper-salinity, strongly acidic, strongly acidic, strongly alkaline, etc.).(i.e., To excessive better deal withexcessive these effects, the modification of bentonite strongly alkaline, etc.).hotspot.
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