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Bentonite Geosynthetic Clay Liner GCL

  • Wholesale
  • Waterproof
  • Polyester geotextile
  • Sodium bentonite clay liner
  • Used for landfill, artificial lake, underground garage etc


The Geosynthetic clay liner--GCL is punched together with non-woven geotextile, woven geotextile and bentonite. Width of the geosynthetic clay liners can be up to 6m and length of 60m. The middle level is bentonite grains, which are carefully selected crude and filled in between the two levels after 

special processing. The bentonite grain in GCL made by this method does not flow in a fixed direction. 

It distributes evenly and forms waterprooflayer, owning excellent waterproof effect. 

This GCL is a kind of waterproof materials, which are widely applied in many waterproof construction projects. GCL can be applied separately, or combined with high density polyethylene (HDPE).




Geosynthetic clay liners’ weight is uniform, permeability is strong, flexible is good, and can be suitable for the uneven foundation settlement, and to prevent the soil loss, cracks and other defects with a good healing. It is mainly used in municipal services, roads, railways, water conservancy, landfill, environmental protection and industrial and civil buildings in the construction of underground seepage control. Our GCL combines the two advantages together, not only containing all the properties of geotextile materials, but also bearing of double waterproof property.



1. Environment friendly

It is raw and natural materials,;aging and corrosion seldom happen. It can keep its quality and then it does not cause any injuries and pollution for human and the environment. It is not only waterproof, but also has good ventilation performance. It can stick up for the exchange of the ecological environment. It is a pure natural, new, green waterproof material.

2. Permanent waterproof, excellent performance

Its waterproof properties are much more durable than that of the buildings. Sodium bentonite would transform to high density septum under hydro pressure. When The thickness is 3mm, the permeability is below a*10-11/sec(a=1~9), which equals to the density of 100 times of the clay with 30 mm thickness. Water retention performance is evident.

3. Easy to construct

Bentonite powder, nails and washers are enough for connection and fixation. Construction is not constrained by weather conditions and it could be taken under cold or wet conditions. Bentonite powder is spread on overlap point. When water comes, GCL would be overlapped automatically. It is so far the only material that starts the waterproof effect by water in the world. It is not necessary to take additional examination when the construction is completed. The repair works are easy in case of waterproof defects. Among the existing waterproof materials, GCLs construction period is the shortest and its operation is the easiest. It has an eminent effect on shortening the construction period as well as saving the cost.

4. Strong self-restore capacity

The integration between waterproof material and its target enables GCL a 20~28 times swelling volume. Even if concrete structure trembles or subsides, the bentonite in GCL would restore the crack of 2mm or below on the concrete structure immediately. Even if the diameter of perforation reaches 30 mm, the restoration will be finished within 15 days completely.


Installation Methods:

Disposal of subgrades:

1.The subgrades must be tamped before paving the GCLs, the surface should be smooth. And it should 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 snow


GCLs 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 the


5.To avoid the GCLs gliding, had best to fix it with nails when installing in vertical and

bevel. Such asdrawing

6.Both sides of the GCLs are geotextile and woven geotextile, when paving, the geotextile

should be nextto the water

7.When paving, examine the GCLs appearance at any moment


Backfill :

1.GCLs(bentonite clay liner )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 with

more than10mm.

3.The soil must be tamped every backfilling 50cm, and the degree of density should be more than


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.


 Technical data:

 Testing Item

Testing Methods

Technical Indexes

Expansion Coefficient

 ASTM  D  5890 


Fluid Loss

 ASTM  D  5891 


Bentonite quality in Unit area

 ASTM  D  5993 


Tension Strength

 ASTM  D  4632 


 Peeling Strength

 ASTM  D  4632


 Indicating flow

 ASTM  D  5887 



 ASTM  D  5887 


 Tension Strength after Wetting

 ASTM  D  5321 

 ≥24Kpa typical







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