Geosynthetics December 2022/January 2023 - 81

GEOSYNTHETIC CLAY LINERS
PRODUCT DATA
FOR MORE INFORMATION
Geosynthetics magazine has provided
information on the geosynthetic clay liner
specification charts for comparative purposes
only. Designers should contact manufacturers
for additional details and to discuss sitespecific
considerations.
Information on the use and specification of
geosynthetic clay liners is also available from
the Geosynthetic Materials Association (GMA).
GMA
1801 County Road B West, Suite 100
Roseville, MN 55113-4052 USA
+1 651 225 6981
fax +1 651 631 9334
fred.chuck@textiles.org
GMAnow.com
PUBLISHER'S NOTE
Geosynthetics magazine compiled
all information included in the 2023
Geosynthetics Specifier's Guide from
information submitted by firms in the
geosynthetics industry. Companies provided
specifications voluntarily, and specification
accuracy is the responsibility of the
manufacturer. The appearance of a listing
in this directory is not an endorsement of
the company or product by Geosynthetics
magazine or the Advanced Textiles
Association (ATA). The 2023 Geosynthetics
Specifier's Guide is intended as a guide, and
Geosynthetics magazine and ATA encourage
readers to contact the companies listed for
further information.
By bonding clay to geosynthetic materials, manufacturers
created an economical, long-term solution for
many applications.
G
eosynthetic clay liners (GCLs) are hydraulic barriers made of clay
bonded to a single geosynthetic layer or to multiple geosynthetic layers.
Because of its low permeability, swelling capacity and relative abundance,
natural sodium bentonite is the preferred clay component of GCLs. A wide
range of materials, including geotextiles and geomembranes, are used to carry
and encapsulate the clay. Also, they provide the product with structural support.
GCLs are used primarily as substitutes for compacted clay liners (CCLs),
providing significant advantages in cost, ease of installation and performance.
Primary applications include surface impoundment, secondary containment
and landfill lining.
GCLs use has grown steadily, and standards have been authored to address
swell and fluid-loss index testing, determination of flux, manufacturing,
sampling, installation and more.
Manufacturing process
GCLs are prefabricated sheets of processed bentonite clay available in multiple
sizes. They are manufactured by encapsulating the clay between two or more
layers of geotextile or by bonding the clay to one side of a geomembrane. The
geotextile-supported products hold the clay in place by soluble adhesives, I-ties
or barbed needlepunching that interlocks the geotextile fibers, or by periodic
rows of heavy stitching through the clay and fabric.
The numbers
Companies that submitted product data chart lines were asked to provide data
determined through industry-accepted testing methods. Companies were
asked to sign a certificate of compliance verifying the accuracy of this data.
GeosyntheticsMagazine.com
81
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Geosynthetics December 2022/January 2023

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