The
composite geomembrane is composed of a geotextile layer and an HDPE geomembrane layer or two HDPE geomembrane layers, and the geomembrane is an HDPE film layer. What is the difference between the two? Geotextiles only require hot-melt welding materials, while composite geomembranes require stitched geotextiles.
1. Test procedure for composite geomembrane
On-site cleaning materials and equipment enter the on-site material design, base fabric joints, external temperature measurement, welding parameter selection, welder inspection and debugging, welding, welding inspection, cloth joint surface, quality inspection, and filling in experimental records.
2. Test process
The parameters of the geomembrane welding machine include: temperature, pressure and speed. These three parameters need to be adjusted and combined to ensure that the geomembrane is welded firmly and firmly, which is a key factor in ensuring the quality of geomembrane welding. Therefore, in the implementation process, the following measures were taken:
(1) Do the test welding of the geomembrane, take a small film not less than 900mm*300mm as the test weld, and then perform the cutting and peeling test of the weld on the traction of the test machine. If the test fails, adjust the parameters and continue testing the weld. If the weldment passes the test, record the values of the three parameters as the welder parameter settings during the formal welding process;
(2) Clean the dust, dirt, oil and other debris on the welding surface of the geomembrane before welding, and keep the welding surface clean and dry. In order to ensure the reliable anti-seepage effect of the geomembrane welded joint, the geomembrane welding adopts double welding.
(3) The width of the double welds is 2*10mm, the overlap width is not less than 10cm, and there is a cavity of 1cm between the welds. All geomembrane welds must be inflated in strict accordance with the design requirements.
