Landfill Bentonite Waterproof Blanket

Landfill Bentonite Waterproof Blanket

Sodium bentonite waterproof blanket (GCL) is a new type of environmentally friendly flexible geosynthetic material. It is mainly used for artificial lake water feature, landfill pond liner, underground garage, roof garden, pool and oil depot and chemical storage yards projects.

GCL is made by filling high expansion sodium bentonite with special composite plastic flat silk geotextile and non-woven fabric. Its needle embroidering method can make the bentonite particles not flow unidirectional and it will form a rubber head water layer with uniform high density when meets water to prevent water leakage.

Waterproof Performance

The key to bentonite’s waterproof performance is its ability to swell up to more than 400 times its dry weight when it becomes wet. This expansion creates a tight seal that keeps water from seeping through. Because the expansion is mechanical and not chemical, the blanket can withstand extreme weather conditions, including freezing and thawing cycles.

Bentonite waterproof blankets are constructed from a bentonite clay laminated to both sides of a virgin HDPE membrane. This creates a strong, durable and watertight barrier that prevents the migration of water between building layers. This is important, as it helps reduce potential damage to the structure and prevents the spread of contamination between different areas of a project.

Compared with traditional organic waterproof materials, bentonite is less likely to deteriorate due to ageing or environmental changes. Landfill Bentonite Waterproof Blanket In addition, bentonite is resistant to most acids and alkalis, making it suitable for use in a variety of environments and applications.

Sodium bentonite swells when it is in contact with water, which means that the blanket can adapt to uneven settlement and repair cracks on the surface within 2mm. This makes it a perfect choice for landfill, underground garage, water scenery and contaminated ground engineering waterproofing. The bentonite in the blanket also helps to protect against pollution and contaminant penetration. This helps to reduce the cost and improve the overall construction efficiency.


The high swelling properties of sodium bentonite make it an ideal material for landfill liners. It can seal the waste from the surrounding soil, preventing infiltration and helping prevent harmful chemicals from leaching into groundwater. It can also reduce the number of pests that can access the waste, such as birds, rats, mice, and insects.

The bentonite layer is encapsulated in a composite of woven and non-woven geotextiles. A proprietary needle punch process interlocks the fabrics together, creating a strong, durable, and effective composite that is resistant to puncture and damage from construction activities. It is not susceptible to deterioration due to UV degradation, aging or deformation, making it a long-term, sustainable cover material for landfills.

The sodium bentonite swells to up to 15 times its volume when wet, forming a dense, impermeable membrane that protects the landfill from water infiltration. The swell action can even self-seal small concrete cracks in the landfill diaphragm wall, caused by ground settlement or seismic activity.

Environmentally Friendly

The bentonite waterproof blanket can be used in a variety of environments such as artificial lake waterscapes, garbage landfills, underground garages, rooftop gardens, water pools, and oil depots. It also can be used in the lining of chemical storage yards. Compared with traditional materials such as sand or concrete, it is safer and more environmentally friendly. Moreover, it can be constructed quickly and easily, and its construction does not require welding.

Sodium-based bentonite swells under water pressure and forms a high-density diaphragm with a water permeability of a x10 – 11 m/sec, equivalent to the compactness of 30cm thick clay. Its strong self-protection performance ensures the waterproof effect, preventing leakage even after a long time or environmental changes.

In addition, the bentonite waterproof blanket can be easily constructed because it does not need a separate drainage layer and can be laid directly on the wet foundation. Moreover, the bentonite waterproof blanket is not affected by cold wind, making it an ideal choice for winter projects.

Yingfan’s bentonite composite waterproof blanket (GCL) is a high-end new geosynthetic material, which can prevent leakage in artificial lake waterscapes, landfills, underground garages, rooftop gardens, pools, oil depots, and chemical storage yards. It is filled with high expansion sodium based bentonite between special composite geotextiles and non-woven fabrics, using the needle punching method. The needle punching can form many small fiber spaces, preventing the bentonite particles from flowing in one direction. When it meets water, a uniform high-density adhesive waterproof layer is formed, and it effectively prevents the leakage of soil.

Easy to Install

The bentonite waterproof blanket is a geosynthetic material used for preventing leakage in artificial lake waterscape, garbage landfill, underground garage, pond, chemical storage yards in oil depots and so on. It consists of composite geotextiles and non-woven fabrics filled with high expansion sodium based bentonite. Sodium bentonite forms a high-density diaphragm in a hydraulic state, has excellent impermeability performance and is easy to install.

In addition, the blanket can be installed using either the blanket method or granular seal. Both methods produce satisfactory results, but the Geosynthetic clay liner blanket method is more labor intensive and requires a greater degree of care.

The waterproof blanket should be firmly anchored in place. It must not be exposed to moisture, which could impair the bonding of the patching materials and reduce its waterproofing efficiency. Do not allow stones and other debris to enter the waterproof blanket. Also, the surface must be free of voids and cracks.

Do not expose the GCL to direct sunlight, which can damage it. The coiled bentonite waterproof blanket must be pressed with a material that will not harm it and should be retained until it is ready to be laid. The blanket should be kept clean, dry and free of oil stains and splashed chemicals. The GCL should not be touched by open flames and cigarette butts, which can damage it and affect its water resistance.