NON-WOVEN GEOTEXTILE
Introduction:
Non-Woven Geotextile are needle punched fabrics made from polypropylene. The dry laid needle punch technology is based on a two step process. Firstly, polypropylene resin is extruded into fibres. Secondly, the fibres are carded and needlepunched. Finally, some types are added thermal treatment. Weights range from 100 g/m2 up to 1200 g/m2.
Functions of Non-Woven Geotextile:
Primary Functions:
Separation
The durability and mechanical properties of Non-Woven Geotextiles make them ideal as separating layers in construction works.
- To prevent mixing of construction layers.
- To improve the compaction properties of the aggregate layer.
- To increase bearing capacity by avoiding material loss into the subgrade.
- To provide long-term stability of foundation layers.
Filtration
The characteristic opening size of Non-Woven Geotextiles is designed to retain particles while
allowing free movement of water, making it possible to separate two layers during intense hydraulic activity.
- To avoid migration of fine material into coarse material as a result of water flow in the soil.
- To maintain the water flow in the soil with minimum pressure loss.
- To prevent migration of fine material as a result of pump effects from dynamic loads such as traffic.
Protection
When placing a Non-Woven Geotextile on both sides of a waterproof membrane, the thickness and strength of the geotextile protect the membrane from puncture.
- To ensure the integrity of a sealing material when fill material and/or loads are applied.
- To protect a membrane and at the same time, drain water in its plane.
Secondary Function:
Drainage
Excess water is drained off the construction - not by passing through the Non-Woven Geotextile as when used for filtration - but by flowing in the plane of the geotextile leading it away from the construction.
- To ensure that water and/or other fluids are drained with minimum pressure loss.
- To ensure an ongoing drainage.
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