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.

Sampling and testing of geotextile filter fabric

Prior to provisional acceptance, samples of the geotextile shall be taken in accordance with the requirements of ISO 9862: 1990 at the rate of one set per 20 number of rolls.

 

Side slope combined protective work of gabions stone cage and Geotextile Fabric

 

Specification the Geotextile Fabric shall comply with the following Data:
(a) Tensile strength(DIN 53857) 225 N/50mm
(b) Elongation at break(DIN 53587) 50%-80%
(c) CBR test resistance(DIN 54307) 1.1kN
(d) Grab strength(ASTM 1682) 0.3kN
(e) Permeability (100mm pressure) 400l/m2/sec
(f) Mass 90 gm/m2

How to Use Geotextile Fabric in Bank Protection Constructions:

Overlay of the fabric shall take place as soon as possible after placement of the fabric. The fabric shall be joined by overlapping with a minimum overlap of 300 mm above water level and 900 mm below water level.

Aerct supplies Geotextile Fabric meeting the construction techniques and that the fabrics are not pierced or damaged during the entire construction period.

The unit of measurement for geotextile fabric shall be in square metres of area shown for coverage. This rate shall cover the supply and installation of the geotextile fabric, inclusive of wastage and overlapping, and includes all plant, labour and materials necessary to carry out the work.

Rock rip rap bank protection with Geotextile lining:

Rock for rip rap protection shall be of the weight and specific gravity approved by the Engineer and shall comprise hard, durable, crushed, quarried or natural stone. The rock shall be free of weak laminations and cleavages.

Preparation of Slopes
Slopes shall be shaped to allow the full thickness of the specified rip rap, and filter material. Slopes shall not be steeper than the slope specified in the Drawings. Where the slopes cannot be excavated to undisturbed material, the underlying material shall be compacted in accordance. A footing trench shall be excavated along the toe of the slope where detailed in the Drawings.

Bedding
Filter fabric shall be placed immediately prior to rock rip rap.
Rock rip rap shall be placed such that the laps in the filter cloth are maintained at all times.

Placing Rip Rap
Rip rap may be placed by hand or by machine and shall be placed to provide a minimum of voids. Stone may be placed by dumping and spreading in layers by bulldozers or other equipment.

Various Applications of Geotextiles:

Filtration
Geotextile can be the filtration layer of the dykes, river canal, seacoast, concrete slope, retaining walls. At the same time of preventing the clay granule from passing, it allows the water and the gas pass through freely.

Separation
The isolation of the railway dregs and the roadbed, roadbed and the soft base, surface of the airdrome and parking lot and the groundsill, different dam materials.

Reinforcement
The highway, railway, soil-stone dam, breakwater, airport, backfill soil of retaining wall, slope protection, etc in which distributes the earth stress, prevents the side-displacement of the earth body and improves the earthbody stability.

Protection
It prevents the bank from being washed out, protects the bank and the bottom, prevents the water and soil from being washed away.

Technical sheet of Polymer Geotextile:

No.	Items		unit	100	200	300	400		500	600	800	1000
1	Weight Variation		%	±5	±6	±6	±6		±6	±6	±6	±6
2	Grab strength	MD	≥ N	350	700	1100	1400		1800	2200	2800	3400
		CD		350	700	1100	1400		1800	2200	2800	3400
3	Grab elongation	MD	%	50 ~ 90				50 ~ 100
		CD		50 ~ 90				50 ~ 100
4	Trapezoid Tear	MD	≥ N	135	280	350	400		480	550	650	750
		CD		135	280	350	400		480	550	650	750
5	CBR bursting strength		≥ KN	1.0	2.1	3.2	3.8		4.5	5.5	6.5	7.5
6	Breaking strength	MD	≥ KN	3.5	8	12	18		24	30	40	50
		CD		3.5	8	12	18		24	30	40	50
7	Breaking elongation	MD	%	40 ~ 65				50 ~ 80
		CD		40 ~ 65				50 ~ 80
8	Puncture strength		≥ N	180	360	550	750		900	1150	1450	2000
9	Thickness		mm	1.4 ~ 1.7	1.8 ~ 2.2	2.4 ~ 2.8	3.0 ~ 3.5		3.6 ~ 4.0	4.0 ~ 4.4	4.8 ~ 5.2	5.6 ~ 6.0
10	Peel strength		N / 5cm	≥ 80				≥ 100
11	Acid and alkali		%	Keep the rate of breaking strength≥ 90% Keep the rate of breaking elongation≥ 90%
12	Sieve size O90		mm	≤0.1
13	Vertical permeability coefficient		Cm / s	≤0.2