Geosynthetics April/May 2023 - 27

* Significantly better flex fatigue resistance
than HDPE and linear low-density
polyethylene (LLDPE)
Fatigue Resistance per AS 4878.9-2001
Results Summary
SAMPLE ID
For any application where the tear,
puncture and flex fatigue characteristics
of HDPE meet the requirements, one can
be confident that PTFE will meet them as
well. See Table 2.
Conclusion
Contamination of rivers, lakes, oceans
and drinking water sources should not
occur in the future due to corrosion of
geomembranes. The job of installing
a geomembrane system without leaks
is a challenging one with many design
considerations.
Furthermore, the absence of the corrosion
variable sets the bar much higher
for the geomembrane industry. Instead
of discussing a potential life for a geomembrane
in terms of years or decades,
the industry can start focusing on design
consideration to achieve " forever " containment
using inert materials. In the
past, " forever " could not be a realistic
target when using materials susceptible
to corrosion. But the use of inert materials
eliminates corrosion and makes " forever "
a realistic target; certainly, rivers,
lakes, oceans, drinking water sources and
future generations deserve this inspirational
target.
References
Rowe, R. K., Jefferis, S., et al. (2022). " Protecting the
environment from contamination with barrier systems:
Advances and challenges. " Proc., 20th International
Conf. on Soil Mechanics and Geotechnical Engineering,
Australian Geomechanics Society, Sydney, Australia.
Scheirs, J. (2020). " Periodic table of geomembranes. "
Webinar, May 26, ExcelPlas Materials Testing. G
Cross-laminated PTFE 1.5mm
HDPE 1.5mm
Excelplas Polymer Analysis
TABLE 2
CYCLES UNTIL FAILURE
5,390,648 (No Failure Observed)
105,366
FIGURE 3
>> For more, search geomembranes
at GeosyntheticsMagazine.com.
FIGURE 4
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Geosynthetics April/May 2023

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