Composite geomembrane

A composite geomembrane is a composite waterproofing material formed by combining a polymer geomembrane (such as HDPE, LDPE, PVC, etc.) with geotextiles (such as long-filament or short-filament nonwoven fabrics, woven fabrics) through thermal lamination or calendering processes. It is widely used in various engineering fields including water conservancy, environmental protection, transportation, and municipal infrastructure. Its core functionality integrates "waterproofing, protection, and reinforcement" into a single system, making it an indispensable key material in modern infrastructure construction.

I. Basic Structure and Classification

Composite geomembranes are primarily classified into the following two types based on the number of geotextile layers and their arrangement:

1. One-layer geotextile with one-layer geomembrane (one-textile-one-film): A single layer of geotextile is laminated onto one side of the geomembrane, suitable for projects with relatively flat substrates and moderate anti-seepage requirements, such as small-scale reservoirs and irrigation channels.

2. Two-layer geotextile with one-layer geomembrane (two-textile-one-film): The geomembrane is sandwiched between two layers of geotextile, providing enhanced protection and mechanical performance, suitable for high-load, complex terrain, or long-term exposed environments, such as large reservoirs and landfills.

In addition, by manufacturing process, they can be divided into hot-lamination and slit-film methods; by membrane material type, HDPE (high-density polyethylene), LDPE (low-density polyethylene), EVA (ethylene-vinyl acetate copolymer), and others can be selected to meet different chemical and physical environmental requirements.

II. Core Performance Advantages

1. Superior Impermeability

The impermeable performance of composite geomembranes primarily relies on the central plastic film layer, which has an extremely low permeability coefficient—typically less than 10⁻¹¹ cm/s and even reaching below 10⁻¹³ cm/s. This means it is virtually impermeable to water, effectively blocking the penetration of liquids and gases. It significantly outperforms traditional clay liners, offering more than 30 times higher seepage prevention efficiency.

2. High Strength and Resistance to Damage

· With a tensile strength ranging from 16 to 28 MPa and a CBR puncture resistance of ≥500 N, the material can withstand stresses caused by construction machinery rolling and foundation settlement.

· The geotextile layers above and below greatly enhance resistance to puncture and tearing, preventing the membrane from being pierced by sharp objects such as stones or rebar during installation or operation.

3. Excellent Environmental Adaptability

· Wide temperature tolerance: Capable of stable operation in environments ranging from -40°C to 80°C, suitable for both extremely cold and high-temperature regions.

· Strong corrosion resistance: Resistant to erosion from acids, alkalis, salts, and organic solvents within a pH range of 2–12, making it suitable for harsh environments such as chemical plants and tailings ponds.

· UV resistance and anti-aging properties: With the addition of antioxidants and carbon black, the service life in outdoor conditions can reach 20–50 years.

III. Construction and Quality Control Key Points

1. Subgrade Preparation: The base surface must be flat and compacted, with sharp objects such as stones and tree roots removed. Slopes should be excavated into stepped formations to enhance stability.

2. Laying Direction: Laying should proceed from upstream to downstream to prevent displacement caused by water erosion; when laying on sloped surfaces, the direction of the membrane deployment should be parallel to the line of maximum slope.

3. Welding Process:

· Use dual-track hot-melt welding with an overlap width of 80–100 mm;

· Welding temperature: 280–300 °C, traveling speed: 2–3 m/min;

· Weld seams must be tested using the "air pressure method" at 0.06 MPa, maintaining pressure for 5 minutes withoutleakage.

4. Damage Repair: Localized damage can be repaired by hot-melt welding using the same material, followed by sealing with polyethylene adhesive.

Shandong Yuanpeng Environmental Protection Technology Co., Ltd. was founded in 2022 with a registered capital ofRMB 50 milion. The company employs over 300 people, and its production facility covers 35,000 square metersEquipped with a professional technical and R&D team, the company is a comprehensive company integratingproduction, sales, and after-sales service.

The company has successfully achieved ISO 9001 quality management system certification. Some of its exported products are SGS certified and hold the relevant patent certificates.