Filament Short Fiber Polyester Nonwoven Geotextiles For Mining Pools Landfill

Non woven geotextile is a new type of construction material used in civil engineering. It is made of PP or PET fibers by needle punched processes. The tensile strength of PP non woven geotextile is higher than PET non woven. But both of them has a good tear resistance and also has a good main function: filter, drainage and reinforcement. Specifications range from 150 grams per square meter to 800 grams per square meter.

Geotextile production raw materials of polyester staple fiber, polypropylene staple wire, polyester filament, polypropylene flat wire, glass fiber, synthetic fiber.

Polyester staple fiber needle nonwoven geotextile, also called short silk geotextile, is mainly composed of polyester staple fiber (PET).

Polyester filament spunbonded needled nonwoven geotextile is also called filament geotextile, and its material composition is mainly polyester chip (polyester PET).

Performance of geotextiles in extreme climates

Due to its material properties and process design, geotextiles have shown strong adaptability under extreme climate conditions, as shown below:

High temperature and ultraviolet environment

1. High temperature resistance

Polyester filament geotextile can withstand high temperatures up to 230°C, and can maintain structural integrity in a continuous high temperature environment to avoid functional failure due to thermal deformation. The molecular chain of its polyester material is highly stable and is not easily softened or degraded after long-term exposure to hot areas (such as deserts and arid areas).

2. Anti-ultraviolet ability

Filament geotextile can significantly reduce material aging caused by ultraviolet rays by adding anti-ultraviolet additives or using dark (such as black) surface treatment. For example, after long-term outdoor use, the tensile strength of the SNG-PET20-6-400 model product can still maintain more than 80% of the initial value.

Low temperature and freeze-thaw cycles

1. Low temperature resistance

Geotextiles can still maintain flexibility at low temperatures of -60°C, and the fibers are not easy to become brittle, making them suitable for high-cold areas (such as permafrost zones and polar projects). Its three-dimensional pore structure can buffer ice expansion pressure and reduce soil structure damage during freeze-thaw cycles.

2. Anti-freeze-thaw damage

The three-dimensional mesh structure formed by the needle punching process allows water to be discharged freely, reducing the risk of internal icing caused by repeated freeze-thaw cycles, and effectively protecting the stability of roadbeds and slopes.

Heavy rainfall and flood environment

1. Efficient drainage and anti-scouring

The water permeability of geotextiles can reach 10⁻¹~10⁻³ cm/s. Under heavy rain or snowmelt conditions, it can quickly drain the accumulated water and prevent soil loss caused by hydraulic scouring. For example, in river slope protection projects, its anti-filtration function can intercept fine particles of soil and maintain water and soil balance.

2. Anti-water pressure and anti-seepage synergy

Composite geotextiles (such as geotextiles + geomembranes) can not only relieve water pressure through the drainage layer in flood disasters, but also block penetration through the anti-seepage layer. They are suitable for dam reinforcement and landfill anti-seepage systems.

Wind and sand and saline-alkali corrosion environment

1. Wind erosion resistance

High-strength polyester filament geotextile can resist the impact of sand and gravel carried by strong winds, and is often used for desert highway roadbed protection. Its products with a weight of ≥400g/㎡ have a tear strength of more than 40kN/m.

2. Chemical corrosion resistance

Polyester materials have natural resistance to acids, alkalis, and salts (such as coastal saline-alkali lands). The applicable pH range is 2~12, and the service life can reach more than 20 years in chemical pollution areas or marine engineering.

Construction and maintenance recommendations

1. Selection for extreme climate adaptation

·High temperature and rainy areas: give priority to filament geotextiles with a gram weight of ≥500g/㎡ and containing carbon black anti-aging agent.

·High-cold frozen soil areas: use high-toughness products with elongation at break ≥50%, and increase the thickness of the covering layer to more than 50cm.

2. Construction precautions

·In areas with strong ultraviolet rays, the outdoor storage time should be shortened, and the soil should be covered in time after laying.

·In areas with frequent freezing and thawing, the overlap treatment should be strengthened (sewing width ≥20cm) to avoid cracking of the joints.