ETL 1110-1-189
14 Feb 03
Membrane Tension
Vertical Membrane
Support
Figure 3. Tensioned membrane effect reinforcement mechanism.
Table 1
Commonly Reported Engineering Properties of Geogrids
Engineering Property
Test Method
Units
Reinforcement Properties
ASTM D 66371
2% or 5% Secant Moduli
kN/m
--2
Coefficient of Pullout Interaction
GRI GG5
Coefficient of Direct Shear
ASTM D 5321
Degrees
Aperture Size
Direct Measure
Mm
Percent Open Area
COE CW-02215
%
Survivability Index Values
ASTM D 66371
Ultimate Tensile Strength
kN/m
Junction Strength
GRI GG2
%
Ultraviolet Stability
ASTM D 4355
%
Experimental Properties3
Flexural Rigidity
Under Development
Aperture Stability
Under Development
1
Modified test method for geogrids in lieu of ASTM D 4595 used for geotextiles.
2
Dimensionless property.
3
The stiffness properties of flexural rigidity and aperture stability are being evaluated.
4
Table adapted from Berg et al. 2000.
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