Geosynthetics February/March 2021 - 16

Bituminous geomembranes for ponds in mining

*	 High puncture resistance for static
puncture following ASTM D4833 is
between 101 and 146 pound-force
(450 and 650 kN), puncture by
aggregates NF P84510 between 4.5
and 7.9 pound-force (20 and 35 kN)
and hydrostatic puncture resistance
ASTM D5147 between 72.7 and 81.8
psi (501 and 564 kPa) for the range of
0.16 and 0.19 inch (4.0 and 4.8 mm)
of thickness and XP P84523 between
152 and 218 psi (1,050 and 1,500
kPa) for the range between 0.14 and
0.19 inch (3.5 and 4.8 mm) of thickness on a bedding with grain size of
FIGURE 2 Typical structure of a BGM

FIGURE 3 Tire-mounted equipment traffic directly on top of BGM

14

Geosynthetics | February March 2021

1-2 inches (25-50 mm). With this
property, tire-mounted vehicles and
equipment can drive on top of the
geomembrane during installation and
maintenance (Figure 3).
*	 BGM has a very low thermal expansion coefficient following ASTM
D1204 and is 100 times lower than
high-density polyethylene (HDPE).
This means there are no wrinkles with
thermal and temperature variations.
Therefore, there is no fatigue phenomenon, and it is possible for welding and covering of the geomembrane
at any time during the day and the
year, without interruption.
*	 The sand surfacing reinforces the UV
resistance of the bitumen. This face
has a friction angle of 34° and up,
depending on the material placed on
top. This value is following ASTM
D5321 tests done by Sageos (Quebec,
Canada) and the Institut National des
Sciences Appliquées de Lyon (INSA)
(Lyon, France).
*	 BGM can store potable water, conferring to the American international
certification of NSF/ANSI 61.
*	 BGM has a high resistance to earthquakes, as demonstrated in the field.
The Milpo Dam in the Chincha
region of Peru is lined with BGM
and had undergone an earthquake
of a magnitude of 8.1 on the Richter
scale. Laboratory testing was followed
to verify the integrity of the geomembrane by Precision Laboratory
in California for the Los Angeles
Department of Water and Power
(LADWP). The lab found no damage
to the integrity of the liner.
*	 Easy to seal to rock and concrete
structures, thus allowing the same
permeability at any point of the lining
(Figures 4a, 4b and 4c).
*	 The manufacturer supplies personnel to train local teams of installers
on-site.



Geosynthetics February/March 2021

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