1. Improved leakage performance 2. Permanent waterproof performance 3. Simple construction and short time limit for a project.

Geosynthetic clay liners (GCLs) are high performance needle punched environmental reinforced composites which combine two durable geotextile outer layers with a uniform core of natural sodium bentonite clay to form a hydraulic barrier. Fibers from the non-woven geotextile are needle punched through the layer of bentonite and incorporated into the other geotextile (either a woven or non-woven).when hydrated under a confining load, the bentonite swells to form a low permeability clay layer with the equivalent hydraulic protection of several feet of compacted clay.

Disposal of subgrades:1.the subgrades must be tamped before paving the GCLs, the surface should be smooth. And itshould not have the obvious hollow space.2.the surface should be dry.3.the minimum angle of land surface exposed to the sun should be more than 30cm.4.the construction of GCLs should be begin until checking out the foundation Preparation before paving the GCLs:1.drawing the GCLs paving order 2.examining the GCLs appearance quality 3.the construction of GCLs should be processed under the weather with no rain and snowGCLs paving :1.when paving the GCLs, it can use the machine and also the manpower.2.paving the GCLs according to the stated order and way. 3.paving the GCLs, seaming overlapping between mat and mat should be staggered. 4.there should not be sand and soil, hydrocele and so on impurity, to avoid affecting on theoverlappingquality.5.to avoid the GCLs gliding, had best to fix it with nails when installing in vertical andbevel. Such asdrawing 6.both sides of the GCLs are geotextile and woven geotextile, when paving, the geotextileshould be nextto the water 7.when paving, examine the GCLs appearance at any moment Backfill :1.GCLs paved must be backfilled on the day. 2.the sand or the sifted soil is the best choice, and the soil should not have impurity withmore than10mm. 3.the soil must be tamped every backfilling 50cm, and the degree of density should be more than85%. 4.pay attention to the GCLs when tamping, it can not be damaged.5.when backfilling in the planar surface, the thickness should be 30cm at least.

Geo synthetic Clay Liner (GCL)