Geosynthetics June/July 2021 - 27

Creep behavior
The creep behavior was determined by
an independent expert laboratory using
the ASTM D6992 standard. The isochronous
curves were obtained according to
this test, which was performed during
several months at several strains on a
creep bench.
The reduction factor for creep is
obtained from the isochronous curves,
getting the remaining fraction of the
initial ultimate tensile strength (load
UTS) at the allowed elongation (determined
by the geotechnical design),
as written in the following formula
(Equation 5):
(5)
Installation damage
The installation damage reduction factor
has been determined by doing in situ
tests (as described in NF G38-064 and
ISO/TR 20432 standards). Strips of the
product have been backfilled with several
soil types, from fine soils to gravel 0-12
inches (0-300 mm) (Figure 5).
After exhuming the product, a visual
inspection was carried out. The woven
geotextile on one side of the GEOTER
F reinforcement geosynthetic protects
the high-tenacity yarns. Therefore,
the product presents less degradation
than most uncoated geosynthetics on
the market.
Tensile strength tests have been
carried out on the exhumed product
by an independent laboratory to determine
the installation damage reduction
factor function of the tested soils
(Table 1).
Durability
The high-tenacity yarns of the selected
reinforcement geosynthetic are made of
PVA. Oxidation has been identified to be
FIGURE 5 In situ tests with several types of soil over the geosynthetic
the significant degradation mechanism
of PVA. Tests on PVA yarns in wet and
dry cycles for the use in reinforced earth
structures (Nait-Ali and Freitag 2009)
results in a reduction factor for durability
of 1.2.
Applying the reduction factor to the
allowable tensile strength determined by
the geotechnical design led to the selection
of the reinforcement geosynthetic
with PVA high-tenacity yarns and UTS
of 2,570 pounds-force per inch (450
kN/m): GEOTER F PVA 450.
Fine material
RFID
1.05
Sand < 2 mm Gravel 0/100 mm Gravel 0/300 mm
1.19
1.15
TABLE 1 Reduction factor for installation damage (RFID) for several types of soil
in contact with the reinforcement geosynthetic
www.GeosyntheticsMagazine.com
27
1.26
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Geosynthetics June/July 2021

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Geosynthetics June/July 2021 - Cover2
Geosynthetics June/July 2021 - 1
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