Geotextile Fabric

Geotextiles are composite synthetic non-woven fabrics for draining and soil retaining in gabion works for bank protection. Geotextile fabric is a cloth material bonded into a homogeneous sheet from a continuous filament and needle punched. The fabrics are resistant to degradation caused by exposure to sunlight. Used as filter cloth, reinforcing materials or draining materials in various bedding uses.

Retaining Wall 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:

Geotextile fabric shall be placed directly on the surfaces behind or under rip rap, stone beaching, retaining walls, drainage backfill, gabions and Reno mattresses, and in any other locations.

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