Composite geomembrane is an impermeable material made by bonding geomembrane with geotextile. It is primarily used for seepage prevention and comes in two types: one-geotextile-one-geomembrane and two-geotextile-one-geomembrane, with widths ranging from 4 to 6 meters and weights between 200 to 1500 grams per square meter. It boasts high physical and mechanical properties such as tensile strength, tear resistance, and puncture resistance, meeting the requirements of civil engineering in water conservancy, municipal, construction, transportation, subway, and tunnel projects. Due to the use of high polymer materials and the addition of anti-aging agents in the production process, it can be used in unconventional temperature environments.

Performance

Composite geomembrane (composite waterproofing membrane) is available in one-bond-one-film and two-bond-one-film configurations, with widths ranging from 4 to 6 meters, and weights from 200 to 1500g per square meter. It boasts high physical and mechanical properties such as tensile strength, tear resistance, and puncture resistance. The product is characterized by its high strength, good elongation, large modulus of deformation, resistance to acids and alkalis, corrosion resistance, aging resistance, and excellent waterproofing performance. It meets the civil engineering needs for waterproofing, isolation, reinforcement, and crack prevention in water conservancy, municipal, construction, transportation, subway, tunnel, and infrastructure projects. Commonly used for waterproofing treatment of embankments and drainage channels, as well as for anti-pollution treatment in waste disposal sites.

Construction

Composite geomembrane is formed by heating one or both sides of the film and pressing the geotextile and geomembrane together through guide rollers. With the advancement of production technology, there is also a casting method for producing composite geomembranes. The configurations include one geotextile and one membrane, two geotextiles and one membrane, and two membranes and one geotextile, etc.

Geotextile, as a protective layer for the geomembrane, ensures the impermeable layer remains undamaged. To reduce UV radiation and enhance aging resistance, it is best to lay it by burial method.

During construction, initially, level the base with smaller diameter sand or clay. Then, lay the geotextile membrane. Do not stretch the membrane too tightly; the ends buried in the soil should be wavy. Finally, lay a 10cm thick layer of fine sand or clay as a transition layer over the laid geotextile membrane. Build a protective layer with 20-30cm stone blocks (or concrete precast blocks). During construction, endeavor to prevent stones from directly striking the geotextile membrane; it's best to perform the protective layer work simultaneously while laying the membrane. To connect the composite geotextile membrane with surrounding structures, use expansion bolts and steel strips to anchor, and brush emulsified asphalt (2mm thick) to bond the connection points to prevent leakage.