HDPE geomembranes for artificial lakes

u HDPE geomembrane Introduction:

1、Material and composition: HDPE geomembrane is a waterproof and impermeable material made of high-density polyethylene resin as the main raw material. High density polyethylene (HDPE) is a highly crystalline, non-polar thermoplastic resin, which makes HDPE geomembrane have good chemical stability.

2、Performance characteristics:

u Excellent impermeability: With very low permeability, the impermeability coefficient can reach 1×10⁻¹⁷cm/s or lower, can effectively prevent liquid leakage, is the ideal impermeability material.

u Good chemical stability: It can resist the erosion of acid, alkali, salt and other chemical substances, and can be used in sewage treatment, landfill and other projects with high chemical stability requirements.

u High mechanical strength: high tensile strength, generally above 10-30MPa, tear strength is also good, can withstand various external forces in the construction and use process.

u Strong weather resistance: It has good anti-ultraviolet and anti-aging properties, and can still maintain good performance under long-term outdoor exposure, and the service life can reach 30-50 years.

u Good temperature adaptability: the use of a wide temperature range, can be used in the environment of -60℃ to +60℃.

3、Production process: mainly blow molding method and calender method. The blow molding method is to extrude the molten resin raw material into a tube blank, and then pass compressed air to expand it and cool it close to the mold wall. Calendering is the process of pressing molten resin into thin sheets through a series of calendering rollers.

4、Application fields: Widely used in water conservancy projects (such as artificial lakes, reservoirs, channels, etc.), environmental protection projects (landfill, sewage treatment ponds, etc.), civil engineering (buildings underground waterproof, roof greening waterproof, etc.) and mining, agriculture and other fields.

5、HDPE geomembrane Price:

u The price of HDPE geomembrane is affected by a variety of factors, such as thickness, quality, raw material price, production process, market supply and demand relations, and the price difference is large. Here are some rough price ranges for reference:

u Thinner specifications: HDPE geomembranes between 0.2mm and 0.75mm are often used in the aquaculture industry, and the price is generally about 1-2 yuan/square meter.

u Medium thickness specifications: 1.0mm-1.5mm HDPE geomemofilm is suitable for impermeable projects such as reservoirs and artificial lakes, and the price is about 6-10 yuan/square meter.

u Thicker specifications: HDPE geomemofilm above 1.5mm is often used in projects with higher impermeability requirements such as regulating ponds, tailings, and landfill sites, and the price may be more than 15 yuan/square meter

HDPE geomembrane life and maintenance

1、Service life

u Under normal use and maintenance conditions, the service life of HDPE geomembrane can reach 30-50 years. Its service life is mainly affected by factors such as material quality, use environment and laying quality.

2、Maintenance measures

u Regular inspection is the key to maintenance. Check whether the surface of the geomembrane is damaged, cracked, perforated, etc. At the same time, attention should be paid to protecting the vegetation and soil around the artificial lake to prevent soil erosion from damaging the geomembrane. If it is found that there is water around the geomembrane, it is necessary to find the cause in time, it may be that the geomembrane leaks or the drainage system is not smooth, and it should be treated in time.

Application advantages of HDPE geomembrane in artificial lakes

1、Excellent anti-seepage performance

u HDPE (High density polyethylene) geomembranes have extremely low permeability. Its permeability coefficient can reach 1×10⁻¹³ cm/s or lower, which means that water can hardly penetrate the geomemofilm. In the application of artificial lakes, it can effectively prevent the leakage of lake water and maintain the water volume of lake water.

2、Good chemical stability

u It can resist the attack of many chemicals. The water in the artificial lake may contain various chemicals, such as disinfectants (such as chlorine) used for water purification, and salts dissolved in the water. HDPE geomembrane has a strong tolerance to these chemicals, and will not decompose or deteriorate due to contact with these chemicals.

3、Strong mechanical properties

u HDPE geomembrane has high tensile strength and tear strength. During the installation and use of artificial lakes, they may be subjected to various external forces. HDPE geomembrane can withstand these external forces, not easy to rupture and other damage, its tensile strength can generally reach more than 10-30MPa, tear strength is also high, to ensure long-term anti-seepage effect.

u Good weather resistance

u Whether in the environment of sun exposure, wind and rain or temperature change, HDPE geomembrane can maintain good performance. In different climate regions, such as cold north and hot south, it can be applied to artificial lake construction.

 HDPE geomembrane in the artificial lake laying points

1、Site preparation

u First of all, the base of the artificial lake should be leveled. Remove sharp stones, roots and other objects that may puncture the soil diaphragm. For uneven ground, compaction and leveling should be carried out to ensure that the slope of the base meets the design requirements.

2、Splicing method

u The splicing of HDPE geomembrae mainly has two ways: hot melt welding and extrusion welding. Hot melt welding uses hot air to heat the edges of the geomembrane to the melting point, and then fuses them together by pressure. Extrusion welding is to melt the welding rod through the extruder and fill in the splicing gap of the geomemofilm, which is suitable for some complex shapes of splicing. During the splicing process, parameters such as welding temperature, speed and pressure should be strictly controlled to ensure the splicing quality.

3、Laying sequence

u It is generally laid from the bottom of the artificial lake, and then gradually laid towards the lake shore and slope. The laying of geomembrane should ensure a certain degree of relaxation to adapt to the settlement and deformation of the foundation.  

The national standard for polyethylene geomembrane is GB/T17643-2011. The standard specifies the terminology and definition of polyethylene geomembrane, basic raw materials, product classification, code and naming, requirements, test methods, inspection rules and marking, packaging, storage and transportation

Comparison of 1.5mm smooth high density polyethylene geomembrane standard

Note: The test methods of GB/T17643 and GM13 are different, but the test data of the two are comparable according to the shape of the sample.

Comparison of 1.5mm rough high-density polyethylene geomembrane standards

Note: The test methods of GB/T17643 and GM13 are different, but the test data of the two are comparable according to the shape of the sample.