Composite geomembrane application

Composite geomembrane is a synthetic material widely used in the field of civil engineering. It is composed of geotextile and geomembrane, and has many excellent properties and a wide range of uses. The following is a detailed introduction to composite geomembrane:

1. Definition and classification
Composite geomembrane, also known as anti-seepage geotextile, is a synthetic material made by bonding geotextile (woven fabric or plastic woven fabric) and PE film (polyethylene film) and other membrane materials through thermal compounding or laminating processes. According to different structures, composite geomembranes can be divided into one cloth and one membrane, two cloths and one membrane, two membranes and one cloth and other forms. Among them, one cloth and one membrane refers to a layer of geotextile attached to a layer of PE film, and two cloths and one membrane refers to a layer of PE film sandwiched between two layers of geotextile.

2. Excellent characteristics
High anti-seepage coefficient: Composite geomembrane has an anti-seepage effect that ordinary waterproof materials cannot match, and is suitable for various projects that require anti-seepage treatment.
Good chemical stability: Composite geomembrane has good chemical stability and can resist the erosion of chemical substances such as acid, alkali, and corrosion. Therefore, it is widely used in sewage treatment, chemical reaction tanks, landfills and other occasions.
Strong aging resistance: Due to the selection of polymer materials and the addition of anti-aging agents in the production process, the composite geomembrane has anti-aging, anti-ultraviolet and anti-decomposition capabilities, and the material service life can reach 50~70 years.
High mechanical strength: The composite geomembrane has good mechanical strength, can withstand certain tensile and tearing forces, and is suitable for various complex geological conditions.
Fast construction speed: The composite geomembrane has high flexibility and can be cut and spliced ​​according to the needs of the project, making the construction convenient and fast.
Environmental protection and non-toxicity: The materials used in the composite geomembrane are all non-toxic and environmentally friendly materials, which will not pollute the environment.
3. Main uses
Water conservancy projects: Composite geomembranes can be used for anti-seepage, plugging, reinforcement of dams of rivers, lakes and reservoirs, and anti-seepage of canals.
Environmental protection projects: In landfills, sewage treatment plants, power plant regulating pools and other occasions, composite geomembranes can provide good anti-seepage effects.
Garden projects: In garden facilities such as artificial lakes, rivers, reservoirs, and golf course ponds, composite geomembranes can be used for waterproofing and moisture-proofing.
Municipal engineering: In municipal engineering such as subways, underground engineering of buildings, planted roofs, roof gardens, etc., composite geomembranes can be used for anti-seepage and reinforcement.
Mining engineering: In mining facilities such as washing pools, heap leaching pools, and ash yards, composite geomembranes can be used as bottom lining anti-seepage materials.
Petrochemical engineering: In petrochemical, chemical plants, refineries and other occasions, composite geomembranes can be used for oil storage tank anti-seepage, chemical reaction pools and sedimentation pool linings, etc.
Aquaculture: In intensive, factory-based aquaculture ponds, fish ponds, shrimp ponds and other aquaculture industries, composite geomembranes can be used for lining and slope protection.
4. Construction precautions
Base surface treatment: Before laying the composite geomembrane, the base surface needs to be cleaned and leveled to ensure that there are no sharp objects, stones and other debris.
Laying method: The composite geomembrane should be laid in a wavy relaxation method to avoid damage caused by pulling too tight. The parts buried in the soil at both ends should be corrugated.
Welding quality: The splicing of composite geomembrane should be welded with a special welding machine to ensure high weld strength and good sealing.
Protective layer construction: After laying, a protective layer such as sand cushion or block stone should be laid on top of the composite geomembrane to prevent ultraviolet radiation and mechanical damage.
In summary, composite geomembrane is a synthetic material with many excellent properties and a wide range of uses. It plays an important role in water conservancy projects, environmental protection projects, garden projects, municipal projects, mining projects, petrochemical projects, and aquaculture.

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