Sodium Bentonite Waterproof Geotextile (GCL)

Waterproof mechanism

Sodium bentonite features high swelling capacity (bentonite particles can expand to 10-30 times their original volume when absorbing water). When the bentonite waterproof mat comes into contact with water, the sodium bentonite within it absorbs water and swells. Under the action of certain compressive forces (such as the building's base, protective layer, and internal fiber tension of the waterproof mat), the molecules interlock and rearrange, reducing the internal voids and forming a dense gel structure. Water molecules cannot pass through, thereby providing waterproofing, with a permeability coefficient as low as 10.-9cm/s。

Key Features

Excellent waterproof and seepage prevention performance: static water pressure resistance up to 0.4MPa or more, permeability coefficient less than 5×10-9cm/s;

◎Easy Installation: The product width is nearly 6 meters, the length can reach 40 meters, with low foundation requirements. Simply connect as per instructions during installation, offering quick construction and a short project timeline.

No impact from construction environment temperature: Construction is possible below -32℃.

Easily repairable: In case of accidental damage to the waterproof layer, it is easy to repair and reinforce.

Excellent self-healing properties: Even after being pierced, it can heal itself upon contact with water.

Durable and Eco-friendly: Natural inorganic materials, non-aging, non-toxic, and environmentally friendly with excellent durability.

Standard Specifications

Width: 6.0m; Length: 30m; Gram Weight: 4500g/m².

Note: The company can produce bentonite waterproof geomembranes in other specifications, sizes, and different technical specifications as per the buyer's requirements.

Application Range

Geosynthetic Clay Liners (GCLs) are used for underground waterproofing and seepage prevention in municipal, highway, railway, water conservancy, environmental protection, and civil and industrial construction projects. During construction, GCLs can be used individually as needed for the project or in combination with other geosynthetic materials or waterproofing materials.

◎ Municipal Traffic: Waterproofing and seepage prevention for subway construction; for road subgrade and embankments, U-shaped channels, and bridge foundations; can be used to improve road performance, prevent mud splashing, and enhance the load-bearing capacity and service life of the road surface and subgrade.

◎Environmental Protection Engineering: Effective in preventing seepage during the construction of landfill sites and wastewater treatment plants, it enhances the strength of embankments and mitigates/avoids soil and water erosion.

In underground waterproofing projects for both industrial and civil construction, it enhances the reliability and durability of waterproofing, accelerates construction progress, and reduces construction costs.

◎Other: Aquaculture farms, artificial lakes, tunnels, cave storages, mines, and other construction requiring waterproofing and seepage prevention.

Construction Method

On a flat and solid subgrade, lay the bentonite waterproof geomembrane (GCL) according to the waterproof design specifications. During installation, the non-woven fabric should face the upstream side, and the joints should be sealed with bentonite sealing powder (or paste). Ensure the construction of the protective layer is completed before the waterproofing mat gets wet.

Key Product Technical Specifications

Standard: (JG/T193-2006)