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Composite geomembrane

Keyword: Composite geomembrane

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　　Composite geomembrane performance characteristics:

　　Composite geomembrane is a geotechnical anti-seepage material made of plastic film as the anti-seepage base material and non-woven fabric. Its anti-seepage performance mainly depends on the anti-seepage performance of the plastic film. At present, the plastic films used for anti-seepage at home and abroad are mainly polyvinyl chloride (PVC) and polyethylene (PE). They are a kind of polymer chemical flexible material with a small specific gravity, strong elongation and high adaptability to deformation. It is corrosion-resistant, low-temperature-resistant and has good anti-freeze performance. Its main mechanism is to use the impermeability of plastic film to block the leakage channel of earth dam, and to withstand water pressure and adapt to the deformation of dam body with its large tensile strength and elongation; non-woven fabric is also a kind of polymer short fiber chemical material, which has high tensile strength and elongation through needle punching or hot-bonding molding. After it is combined with plastic film, it not only increases the tensile strength and puncture resistance of plastic film, but also increases the friction coefficient of contact surface due to the rough surface of non-woven fabric, which is conducive to the stability of composite geomembrane and protective layer. At the same time, they have good corrosion resistance to bacteria and chemical effects, and are not afraid of corrosion by acids, alkalis, and salts.

　　Product structure:

　　One cloth and one membrane, two cloths and one membrane, multiple membranes and multiple cloths, etc.

　　Application range:

　　Geotechnical dam, rockfill dam, crisp stone dam and roller compacted concrete dam; horizontal anti-seepage blanket in front of embankments and dams, vertical anti-seepage layer of foundations; tailings dams, sewage reservoirs and reservoir areas; construction cofferdams; channels, liquid storage tanks (pits, graves); waste yards; anti-seepage linings of subways, basements, tunnels, and tunnels; roadbeds of highways, expressways, and railways; road mats and other foundation salt prevention and control; waterproof layers of expansive soils and collapsible loess; roof leak prevention.

Performance indicators of composite geomembrane (GB/T17642-2008)

Serial number	Project	Indicators	Tolerance, %	Remarks
1	Unit area mass (g/m2)	As per design or contract provisions	-10
2	Width (cm)	As per design or contract provisions	-1.0
3	Breaking strength (KN/m)	As per design or contract provisions	-5	Vertical and horizontal
4	Elongation at break (%)	30-100	Meet design requirements	Vertical and horizontal
5	Tear strength (KN)	According to design or contract provisions	-8	Vertical and horizontal
6	CBR breaking strength (KN)	As per design or contract provisions	-5
7	Peel strength (N/cm)	6	No less than standard	Vertical and horizontal
8	Hydrostatic pressure resistance (MPa)	As per table 3	No less than standard
9	Permeability coefficient (cm/s)	According to the design or contract provisions	Meet the design requirements