HDPE geomembrane is one of the commonly used geosynthetics in landfill engineering. It is made of high quality polyethylene raw resin, mainly composed of 97.5% high density polyethylene, about 2.5% carbon black, anti-aging agent, antioxidant, UV absorber, stabilizer and other excipients.
It has small proportion, strong ductility and high habitual deformation. The main mechanism is to use the impermeability of plastic film to separate the leakage channel, and to bear the pressure and habitual deformation with its large tensile strength and elongation.
Main functions of HDPE geomembrane used in hazardous solid waste landfill
The impermeability of HDPE geomembrane is the main index to measure whether the landfill meets the requirements of environmental protection. The experimental data of water vapor permeation are between 0.5 × 10-10 ~ 0.5 × 10-13 cm / s,
Therefore, the main function of HDPE geomembrane in landfill is to prevent the leakage of leachate and landfill gas, and to prevent harmful substances from polluting the surrounding environment.
First of all, assign surveyors to accurately measure the actual terrain, record the measurement scale in detail, plan the plane according to the measurement scale, select datum point a as the starting point of laying the geomembrane, cut the membrane according to the plan, and prepare the number of each membrane,
Roll the data to the corresponding position of the construction site in turn and carry out the welding test, i.e. test welding. Before welding, the professional welding technicians shall complete the test welding.
Test welding shall be carried out before all the initial stages and shutdown, or when the equipment fails and needs to rest for at least four hours before restart, or when the climatic conditions change. The test mainly includes the stripping and shear test of spline.
All test welding shall be carried out under the same welding conditions as the actual one. Once the test welding quality is confirmed as qualified, the welding parameters shall not be changed during the formal welding process until the next test welding is stopped.