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Geosynthetic clay liner series
Geosynthetic clay liners

 

updatatime:[2013-1-20 15:35:15]    source:TAIAN CITY HAIFENG EARTHWORK MATERIAL CO.,LTD

 
 



                           Geosynthetic clay liners (GCLs)are an established sealing product in the geoenvironmental industry.They are used in landfill caps and for above ground tank farms,as well as within various other containment structures such as dams,canals,prnds,rivers and lakes,They are also used for waterproofing of buildings and other similar structures.Rolled out like a carpet to provide a durable impermeable liner,geosynthetic clay liners consist of a layer of high swelling so-dium bentonite . sandwiched between two geotextiles.by different techniques,manufactured GCL ,taishanshen,is mechanieally bonded by needlepunching from one nonwoven grotextile through the bentonite to the other nonwoven or woven geotextile.
                                   Sodium Bentonite is a naturally occurring clay with hundreds of uses.Comprising mainly montmorillonite, a layered clay mineral with broad flat platelets which are idcally.shapcd to provide a hydraulic barrler .Sodium lons Iocated between these platelets allow water to hydrate the bentonite in an absorption reaction that results in the bentonites swelling characteristics,swells when contacted with water approximately 900% by volume or 700%by weitht. When hydrated under confinement ,the benlonite swells to form a low permeability clay layer with the equivalent hydraulic protection of several fect of compacted clay.This swelling allows the bentonite to seal around penetrations,giving the GCL self sealing characteristics,During hydration ,a confinod laycr of dry bentonite changes into a dense monolithic mass with no observablc individual particles.A fully hydrated sodium benforfite layer can have a hydraulic conductivity of approximately one hundred times lower than a typical compacted clay liner (CCL),Reeause of their low hydraulic conductivity,GCLs are used mainly as a replacement for thick,difficult to build ,compacted clay liners to provide a barrter to liquid and gases .Permathene supply and install a range of GCLs from light to heavy grades,These are high performance environmental liner comprised of geosynthetic carrier componcnts integrated with a layer of low permeability sodium bentonite .The rolls are supplied in wide widths,minimising seams.Installation is fast.

Material property

Test method

Test Frequency  ft2(m2)

Required Values

Bentonite Swell Index1

ASTM D 5890

1 per 50 tonnes

24mL/2g min.

Bentonite Fluid Loss1

ASTM D5891

1 per 50 tonnes

18mL max.

Bentonite Mass/Area2

ASTM D5993

4,000m2

≥4.0kg/m2

GCL Grab Strength3

ASTM D4595

EN 10319

200,000ft2 (20,000m2)

MD AND CMD≥12kn/m

GCL Grab Strength3

ASTM D4632

ASTM D6768

200,000ft2 (20,000m2)

120 lb(530N)MARV

30 lbs/in (53N/cm)MARV

GCL Peel Strength3

ASTM D4632

ASTM D6496

40,000ft2 (4,000m2)

15 lbs (65N)min

2.5lbs/in (4.4N/cm)min

GCL Index Flux4

ASTM D 5887

Periodic

1x10-8 m3 /m2 /sec max

GCL Hydraulic Conductivity4

ASTM D 5887

Periodic

5x10-9  cm/sec max

GCL Hydrated Internal Shear Strength5

ASTM D5321

ASTM D6243

Periodic

500 psf (24kpa) typical

Roll size

5.8m width x 30m length per roll



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tel/fax:+86-538-6616366 Mobile:+86-13705385933 Contact:Mr Wang    E-mail:hua818@vip.163.com

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