Bi-Axial Knitted Geogrid Microgrid is a finely-knitted polyester, saturation-coated geogrid with an open structure, it provides excellent interlock with soils while maintaining high permeability. Microgrid is precision knitted with diagonal "stabilizer" tie yarns and impregnated with PVC, resulting in a stable finished product that is easy to handle and install. Microgrid is a biaxial geogrid, with equal strengths in both the machine (MD) and cross machine (CMD) direction.
The small apertures of Microgrid allow this product to be used as a face wrap due to its excellent soil retention properties. Its permeability promotes the rapid establishment of vegetation, while its low creep makes it resistant to the "sagging" that often occurs with lower strength materials. When used as an internal reinforcement, the aperture size provides superb interlock with a wide range of soils while allowing water to migrate through the soil. Easy to install, Microgrid represents a new class of geosynthetics for soil reinforcement.
| PROPERTY |
TEST METHOD |
ENGLISH |
METRIC |
| Ultimate Strength |
ASTM D-6637 Method A |
2,000 lbs/ft |
29.2 kN/m |
| Creep Limited Strength |
ASTM D-5262/D-6992 |
1,149 lbs/ft |
16.8 kN/m |
| Long Term Design Strength (Sands, Silt and Clay) |
LTDS or Tal |
871 lbs/ft |
12.7 kN/m |
| Molecular Weight (min.) |
GRI GG8 |
|
25,000 g/mol |
| Carboxyl End Group Count (max.) |
GRI GG7 |
|
30 Meg/kg |
| ROLL SIZE |
AREA |
WEIGHT |
| 8' x 225' |
200 sys |
85 lbs |
| REDUCTION FACTOR |
VALUE |
| installation damage (Sand, Silt & Clay, D50 <1.0mm) |
1.20 |
| installation damage (1” minus graded aggregate, D50 < 6mm) |
1.20 |
| installation damage (1.5” minus angular aggregate, D50 < 20mm) |
1.90 |
| durability |
1.10 |
| SOIL INTERACTION COEFFICIENT |
VALUE |
| Sand/Clay (ML, CL) |
0.6 - 0.7 |
| Sandy Silts & Clay (SC,GC) |
0.7 - 0.8 |
| Uniformly-Graded Sands, Silty Sand (GP, SP, SM) |
0.8 - 0.9 |
| Gravel, Sand Gravel Mix, Well-Graded Sand (SW, GW) |
0.9 - 1.0 |
Spec Interpretation