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Sodium Bentonite Waterproof Blanket

The mineralogical name of bentonite is montmorillonite, and natural bentonite is mainly divided into two categories: sodium-based and calcium-based according to its chemical composition. Bentonite has the characteristics of swelling with water. Generally, when calcium-based bentonite expands, its expansion is only about 3 times of its own volume, while sodium-based bentonite absorbs five times of its own weight of water when it meets water, and its volume expands to more than 15-17 times of the original. Sodium-based bentonite is locked between two layers of geosynthetics to protect and reinforce GCL, so that GCL has a certain overall shear strength.

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  • Bentonite waterproof blanket

      The mineralogical name of bentonite is montmorillonite, and natural bentonite is mainly divided into two categories: sodium-based and calcium-based according to its chemical composition. Bentonite has the characteristics of swelling with water. Generally, when calcium-based bentonite expands, its expansion is only about 3 times of its own volume, while sodium-based bentonite absorbs five times of its own weight when it meets water, and its volume expands to more than 15-17 times of the original. Sodium-based bentonite is locked between two layers of geosynthetics, which plays a role of protection and reinforcement, so that GCL has a certain overall shear strength.

    GCL is a kind of impermeable liner between GCL (on-site thick compacted clay impermeable liner) and polymer material-geomembrane. It is mainly used in waste landfills, underground reservoirs, underground infrastructure construction and other projects in environmental engineering to solve the problems of sealing, isolation and leakage prevention, with good effect and strong anti-destruction.

    Bentonite waterproof blanket according to the production process can be divided into: needle method sodium bentonite waterproof blanket, needle coating method sodium bentonite waterproof blanket and adhesive method sodium bentonite waterproof blanket. The needle-punched coating method sodium bentonite waterproof blanket is to compound a layer of high density polyethylene geomembrane on the outer surface of the non-woven geotextile of the needle-punched sodium bentonite waterproof blanket. Adhesive method sodium bentonite waterproof blanket is a kind of sodium bentonite produced by bonding bentonite particles to high density polyethylene plates with adhesives.

    Features of Bentonite Waterproof Blanket

    Compactness

    Sodium bentonite forms a high-density diaphragm under water pressure. When the thickness is about 3mm, its water permeability is less than & × 10 ˉ 11m/sec, which is equivalent to 100 times the compactness of clay with a thickness of 30cm, and has strong self-retaining water performance.

    With permanent waterproof performance

    Because sodium bentonite is a natural inorganic material, it will not undergo aging or corrosion even after a long time or changes in the surrounding environment, so the waterproof performance is durable.

    Simple construction and short construction period

    Compared with other waterproof materials, the construction is relatively simple and does not require heating and pasting. Just use bentonite powder and nails, washers, etc. to connect and fix. No special inspection is required after construction, and it is easy to repair if waterproof defects are found. GCL is the shortest construction period of existing waterproof materials.

    Not affected by temperature

    It will not break in cold climates.

    Integration

    Integration of waterproof materials and objects: sodium-based bentonite has 20-28 times of expansion capacity when exposed to water. Even if concrete structures vibrate and settle, bentonite in GCL can repair cracks on concrete surfaces within 2mm.

    green environmental protection

    Bentonite is a natural inorganic material, which is harmless to the human body, has no special impact on the environment, and has good environmental performance.

    Product Features

    The performance price ratio is high, and the use is very extensive. The product range can reach 6 meters, which greatly improves the construction efficiency.

    Scope of application and application conditions: applicable to municipal (landfill), water conservancy, environmental protection, artificial lake and building underground waterproof, anti-seepage engineering.

    It can still be constructed under negative temperature (-20 ℃) when traditional waterproof materials cannot be constructed. It can also be constructed on wet base (without open water); It cannot be constructed in rainy and snowy weather; It is not suitable for anti-seepage of strong acid and strong alkaline solution. Because bentonite is an inorganic material, its durability is better than that of organic waterproof material.

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