||Needle-Punched Geosynthetic Clay Liner News
Needle-punched geosynthetic clay liner (GCL) manufacturers will
benefit from ASTM D 6496, Standard Test Method for Determining
Average Bonding Peel Strength Between the Top and Bottom Layers
of Needle-Punched Geosynthetic Clay Liners.
The test method is now available to assist in certification of
GCLs used to contain waste and water. Ultimately, data obtained
with D 6496 can lead to the elevation of water and waste containment
safety by assessing its internal stability.
This standard will initially benefit the needle-punched geosynthetic
clay liner (GCL) manufacturers in their production of quality
control and certification documents, explains Robert Mackey,
P.E., senior design engineer, S2L, Inc., Maitland, Fla., who chairs
the ASTM GCL subcommittee and task group. Future uses include
quality assurance testing by the GCL users and correlation with
ASTM D 6243, Standard Test Method for Determining the Internal
and Interface Shear Resistance of Geosynthetic Clay Liner by Direct
ASTM D 6243 is a difficult test that requires several days to
get the results for internal shear strength of the GCL. Researchers
have attempted to correlate peel strength of the GCL to the internal
shear strength. However, there has not been a standardized test
method for peel strength or internal shear strength until recently.
This test method will allow the research to continue and develop
a standardized database of results. The end outcome will allow
the design engineer and/or user to specify GCLs which meet design
stability requirements without the continuous need of a difficult
test and time requirement.
The test was developed by the combined effort of representatives
from the manufacturers, geotechnical testing laboratories, geotechnical
researchers, government agencies, and design engineers in a task
group of ASTM Subcommittee D35.04 on Geosynthetic Clay Liners,
under Committee D35 on Geosynthetics.
ASTM standards are available by calling Customer Service (610/832-9585),
or through the Web site.
For further technical information, contact Robert E. Mackey, P.E., S2L, Inc., 529 Versailles Dr., Suite 103, Maitland, FL
32751 (407/475-9163). Committee D35 meets June 21-23 in Toronto,
Ontario, Canada. For meeting or membership details, contact manager
Pat Picariello, ASTM (610/832-9720). //
Copyright 2000, ASTM