Geosynthetics October/November 2023 - 41

Geomembrane has just been adopted.
This nondestructive test method covers
the direct measurement of the thickness
of the weld edge of geomembranes. The
thickness of a weld edge is observed as
a direct read from a handheld thickness
gauge used as a planimeter, as shown in
Figures 2a, b and c. The measured thickness
of the geomembrane weld edge may
vary considerably depending on how it
was fabricated. To reduce variation and
improve quality, thickness thresholds are
now regularly set in specifications to limit
excessively thin material at the weld edge.
Traditionally, seams have been tested
and assessed on the basis of shear and
peel strengths. It is acknowledged that
there is a stress concentration adjacent
to the seam, and it can be a very complicated
stress state at the intersection.
However, the strength and integrity of
the seam is paramount to a successful job.
A concluding thought when considering
the thickness of the geomembranes
being welded: the actual weld interface
area is the same and the expectations of
weld strength should be the same. Yet,
when we specify shear and peel strengths,
the specified strengths increase with thickness.
Does this mean we are expecting better
bonding in thicker geomembranes? If
we are welding the same materials with the
same interface area, we should be achieving
the same weld properties independent
of thickness. In specifying higher strengths
for thicker materials, we are simply measuring
the strengths of the geomembrane
itself. In no way are we assessing the weld
integrity to any significant extent. Please
realize this is only one parameter that the
installers are striving to control. G
>> For more, search GSI at
GeosyntheticsMagazine.com.
FIGURE 1 Relationship between thickness and strength
of HDPE for both blown film and cast fabrication
FIGURE 2A Handheld thickness device
FIGURE 2B Ball points
FIGURES 2A-C Photographs
of GRI GM-37 weld edge
thickness measurement
FIGURE 2C Weld edge thickness measurement
GeosyntheticsMagazine.com
41

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Geosynthetics October/November 2023

Table of Contents for the Digital Edition of Geosynthetics October/November 2023

Geosynthetics October/November 2023 - Cover1
Geosynthetics October/November 2023 - Cover2
Geosynthetics October/November 2023 - 1
Geosynthetics October/November 2023 - 2
Geosynthetics October/November 2023 - 3
Geosynthetics October/November 2023 - 4
Geosynthetics October/November 2023 - 5
Geosynthetics October/November 2023 - 6
Geosynthetics October/November 2023 - 7
Geosynthetics October/November 2023 - 8
Geosynthetics October/November 2023 - 9
Geosynthetics October/November 2023 - 10
Geosynthetics October/November 2023 - 11
Geosynthetics October/November 2023 - 12
Geosynthetics October/November 2023 - 13
Geosynthetics October/November 2023 - 14
Geosynthetics October/November 2023 - 15
Geosynthetics October/November 2023 - 16
Geosynthetics October/November 2023 - 17
Geosynthetics October/November 2023 - 18
Geosynthetics October/November 2023 - 19
Geosynthetics October/November 2023 - 20
Geosynthetics October/November 2023 - 21
Geosynthetics October/November 2023 - 22
Geosynthetics October/November 2023 - 23
Geosynthetics October/November 2023 - 24
Geosynthetics October/November 2023 - 25
Geosynthetics October/November 2023 - 26
Geosynthetics October/November 2023 - 27
Geosynthetics October/November 2023 - 28
Geosynthetics October/November 2023 - 29
Geosynthetics October/November 2023 - 30
Geosynthetics October/November 2023 - 31
Geosynthetics October/November 2023 - 32
Geosynthetics October/November 2023 - 33
Geosynthetics October/November 2023 - 34
Geosynthetics October/November 2023 - 35
Geosynthetics October/November 2023 - 36
Geosynthetics October/November 2023 - 37
Geosynthetics October/November 2023 - 38
Geosynthetics October/November 2023 - 39
Geosynthetics October/November 2023 - 40
Geosynthetics October/November 2023 - 41
Geosynthetics October/November 2023 - 42
Geosynthetics October/November 2023 - 43
Geosynthetics October/November 2023 - 44
Geosynthetics October/November 2023 - Cover3
Geosynthetics October/November 2023 - Cover4
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https://www.nxtbook.com/ata/geosynthetics/geosynthetics-april-may-2024
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https://www.nxtbook.com/ata/geosynthetics/geosynthetics-december-2023-january-2024
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https://www.nxtbook.com/ata/geosynthetics/geosynthetics-april-may-2023
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https://www.nxtbook.com/ifai/geosynthetics/geosynthetics-december-2021-january-2022
https://www.nxtbook.com/ifai/geosynthetics/geosynthetics-october-november-2021
https://www.nxtbook.com/ifai/geosynthetics/geosynthetics-august-september-2021
https://www.nxtbook.com/ifai/geosynthetics/geosynthetics-june-july-2021
https://www.nxtbook.com/ifai/geosynthetics/geosynthetics-april-may-2021
https://www.nxtbook.com/ifai/geosynthetics/geosynthetics-february-march-2021
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