Geoscience Reference
In-Depth Information
presence (in the ground or in water) of metals that may act as a catalyst for the
ageing process;
aggressiveness of the environment (presence of organisms in the soil, acid or alkali
environment, etc).
For most applications of geotextiles it is the manner of construction and the extent
of exposure to UV radiation that is important. As is shown in this manual, geotextile-
encapsulated sand elements are subject to tensile loads during installation only, and
thus, little account needs to be taken of longer-term mechanical effects.
2.4.8 CE marking
Many testing methods have been developed for geotextiles, several of which have been
standardised by European (EN) or International (ISO) standards. In the context of CE
Table 2.8
Sample standard specifications of geotextiles.
Non-woven
(usually PP)
Geotextile
GT 750M
GT 1000M
PE
Structure
Structure type
Textile
materials/
fabric
Textile
materials/
fabric
Textile
materials/
fabric
Nonwoven
Yarn type
Split fibre
Split fibre
Monofilament -
Colour
Black
Black
Black
-
Mechanical properties
Nominal tensile strength MD
kN/m
120
200
40
19-28
Strain at nominal tensile strength
%
15
15
25
50-80
Tensile strength at 10% strain
kN/m
-
-
-
Tensile strength at 5% strain
kN/m
30
55
-
-
Tensile strength at 2% strain
kN/m
-
-
-
-
Nominal tensile strength CD
kN/m
110
200
35
-
Strain at nominal tensile strength
%
11
12
25
-
Puncture strength
kN
14
20
4
4
Displacement upon puncture
mm
45
40
-
Cone drop test
mm
6
6
12
-
Hydraulic properties
Permeability (at 50 mm)
l/m
2
/s
20
20
500
60
Water column at 10 mm/s
mm
30
30
7
-
Pore size (
O
90
)
μ
m
250
320
525
90
Durability
UV resistance
klasse
C
C
B
-
Oxidation resistance
klasse
B
B
D
-
Physical properties
Weight
g/m
2
570
840
210
500
Thickness
mm
1,0
1,4
0,8
3,6
Reel width
m
5,20
5,20
5,05
5,0
Reel length
m
200
200
100
50
Reel diameter
m
0,5
0,6
0,30
0,5
Reel weight
kg
380
480
105
135
