Geosynthetics December 2021/January 2022 - 93

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
fcchuck@ifai.com
www.GMAnow.com
PUBLISHER'S NOTE
Geosynthetics magazine compiled all
information included in the 2022 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 Industrial Fabrics Association
International (IFAI). The 2022 Geosynthetics
Specifier's Guide is intended as a guide, and
Geosynthetics magazine and IFAI 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.
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Geosynthetics December 2021/January 2022

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