What is geomembrane? Construction specifications and standards of geomembrane?

Geomembrane is a geoimpermeable material composed of plastic film as impermeable substrate and non-woven fabric, and its impermeable performance mainly depends on the impermeable performance of plastic film. At present, plastic films for impermeable applications at home and abroad, mainly polyvinyl chloride (PVC) and polyethylene (PE), EVA (ethylene/vinyl acetate copolymer), tunnel applications are also designed to use ECB (ethylene acetate vinyl modified asphalt blend geomembrane), they are a kind of polymer chemical flexible materials, small specific gravity, strong extensibility, high ability to adapt to deformation. Corrosion resistance, low temperature resistance, good freezing resistance.

Geomembrane is a kind of waterproof barrier material based on high polymer. Mainly divided into: low ** density polyethylene (LDPE) geomembrane, high density polyethylene (HDPE) geomembrane and EVA geomembrane.

Construction code for geomembrane

1) The joint treatment of geomembrane is a key procedure of construction, which directly affects the operation life of the project. According to the quality inspection, the thermal welding method is ideal. (can also be used for special adhesive bonding) The thermal welding method is the surface heating treatment of PE geomembrane, so that the surface is melted, and then fused into one through pressure.

(2) The geomembrane should be laid in a certain direction, and a certain PE film and PET non-bonding layer should be reserved on both sides of the geomembrane, and the direction of each unit geomembrane should be adjusted when laying, so as to facilitate the welding of the two units of geomembrane.

(3) After the geomembrane is laid, it is necessary to press with sand bags to prevent wind movement, and there is no dirt, water, dust and so on at the edge joints.

(4) Before welding, it is necessary to adjust the two sides of the joint PE single film, so that it is bonded to a certain broadband, and it is flat and without wrinkles.

(5) When welding, it is necessary to have a certain experience of technical personnel welding, welding using a special welding machine for welding. To adjust the temperature and speed, (can also be glued).

According to years of practice, the thickness of geomembrane is not less than 0.25mm, too thin may produce porosity, and easy to be damaged in construction and reduce the anti-seepage effect. In the construction of geomembrane, special attention should be paid to the laying should not be too tight, should not be wrinkled, and the splicing should be firm. Construction should be strictly in accordance with technical specifications, and five quality passes such as preparation, laying, splicing, inspection and backfilling should be prepared

The standard of geomembrane;

GB/T 17643-1998 Geosynthetic materials polyethylene geomembrane GBT 17643-1998 geosynthetic materials polyethylene geomembrane This standard specifies the classification and naming, technical requirements, test methods, inspection rules, marking, packaging, transportation and storage of polyethylene geomembranes. This standard is applicable to polyethylene-rare earth film produced by adding various additives to polyethylene resin and ethylene copolymer as raw materials.