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Geotextile Fabric- Geotextile Filter Fabric - Non Woven Fabric Geotextile for Gabion Works - River Bedding Filter and Reinforcing Material
Geotextile is also called Geotextile filter fabric, or Geo Textile, a kind of thermally bonded synthetic non-woven homogeneous sheet from a continuous filament and needle punched, placed on the surfaces under gabion rip rap, stone beaching, retaining walls, drainage backfill as filter cloth material for draining and soil retaining in bank protection gabion works. Geotextile fabrics are supplied both needle punched or woven polymer type, offering excellent tensile strength and UV resisting property to degradation.
General requirements for geotextile filter fabric
The geotextile filter fabric shall meet or exceed the requirements stated hereunder in full. The geotextile filter fabric shall be polymer sheet of woven polypropylene of minimum sheet or non woven. The fabric shall be inert to chemicals commonly encountered in sea water and natural soil conditions. In particular it must be non-biodegradable, resistant to most soil chemicals and bacteria, unaffected by acids and alkalines within a PH range of 3 to 12 and treated during the manufacturing process to withstand prolonged e:xposure to ultraviolet degradation.
Required properties for geotextile filter fabric
The geotextile filter fabric delivered to the site shall meet or exceed the technical values stated below, guided by IS09001.
Properties and approved methods of testing of geotextile filter fabric
|
Geotextile Property |
Min, Average Roll Value |
Approved Method of Testin |
|
Weight (mass per unit area) |
2350 m2 |
EN 965 |
|
Nominal tensile strength at wrap and weft direction |
2 80 kN/m |
EN ISO 10319 |
|
Tensile elongation at nominal strength at wrap and weft direction |
12% |
EN ISO 10319 |
|
CBR puncture resistance |
2 6 kN |
EN ISO 12236 |
|
Characteristic pore size 090 (dry sieved) |
250 pm |
BS 6906 2 or NEN 5168 |
|
Characteristic opening size 090 (wet sieving) |
200 um |
EN ISO 12956 |
|
Water Permeability |
2 0.010 m/sec |
EN-ISO 1 1058 |
|
Ultra Violet resistance (Xenon test) |
2 75% of ultimate tensile stren th |
ASTM D4355-92 |
Note: The UV stability of the fabric shall be such that after 500 hours of accelerated weathering in a Xeri0 test 1200, according to ASTM D4355-92, the fabric shall retain at least 75% of its minimum strip tensile strength.
Delivery requirements for Geo Textile
Geotextiles are delivered in rolls of minimum width 5.00 meters. The length of each roll shall be at least 200 meters. Or custom requirements.
Geotextiles shall be delivered in packaging suitable for the protection of the rolls from degradation by ultra violet light. The labelling shall clearly identify the product supplier in accordance with BS EN 30320.
Transportation and Storage requirements
During all periods of shipment, land transportation and storage the filter fabric shall be protected from direct sunlight, ultra violet rays and temperatures greater than 600 C. Geotextiles shall be protected at all times against physical or chemical damage. Geotextiles shall be kept in the wrappings provided by the manufacturer. The Supervisor shall reject filter fabric if it has been removed from its protective cover for more than 72 hours prior to use, or if it has defects, tears, punctures, shows deterioration, or damage incurred during manufacture, transponation, or storage. The rolls of geotextile shall be stored on level ground and stacked not more than five rolls high and no other materials shall be stacked on top of the geotextiles.
