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The Geosynthetic Clay Liner (GCL) are produced in three types: Stitch bond, Needle punch and Resin bond, which is needle punching type is often used in sealing of underground structures. These types of GCLs consist of two layers, One woven and one not woven geotextiles, which are joined together in a Specific method called needle punching. Between these two layers of geotextile, natural sodium bentonite is used, which, in addition to very low permeability, as soon as the soil is contacted with water, it is swollen and does not allow water to penetrate. Bentonite sodium clay, which is obtained from the erosion of volcanic rocks, which is a branch of the Montmorillonite clay, and with very low permeability and a very high inflation index, provides good conditions for sealing in buried conditions. Among the advantages of Geosynthetic Clay liner, the following can be mentioned:

• Geosynthetic Clay Liner are capable of self-repair due to clay bentonite Swelling.
• Geosynthetic Clay Liner are compatible with fresh concrete.
• Ability to use in underground structures, agricultural ponds, landfills and …

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