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Geogrid
# Geogrid Material
Geogrid has been one of geotextile reinforcement materials and there are various kinds of material, shape, and use.
# Geogrid Stiffener Type
| Classification | Softness | Stiffness |
|---|---|---|
| direction | One-way,, Bi-directional | One-way,, Bi-directional |
| material | PET (PVC coating), URETHANE | PP, PET, HDPE |
| form |  |
 |
# Physical Features of Geogrid
| Parts | contents | 6T | 8T | 10T | 15T | 20T | |||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Geogrid Exterior dimensions |
hole grid size (A×B,C×D) (mm) |
A x B | C x D | A x B | C x D | A x B | C x D | A x B | C x D | A x B | C x D |
| 23.4× 26.8 |
20.1× 22.6 |
23.8× 25.8 |
19.8× 21.6 |
26.8× 25.8 |
19.5× 21.6 |
27.0× 24.6 |
19.2× 20.0 |
28.8× 23.6 |
18.2× 19.6 |
||
| thickness(mm) | Main rib | secondary rib |
Main rib | secondary rib |
Main rib | secondary rib |
Main rib | secondary rib |
Main rib | secondary rib |
|
| 1.1 | 1.5 | 1.5 | 1.7 | 1.7 | 1.9 | 1.9 | 2.0 | 2.0 | 2.2 | ||
| contact thickness(mm) | 1.5 | 1.8 | 2.0 | 2.2 | 2.4 | ||||||
| grid Density |
numbers of rib/m | Main rib | secondary rib |
Main rib | secondary rib |
Main rib | secondary rib |
Main rib | secondary rib |
Main rib | secondary rib |
| 42±1 | 32±1 | 42±1 | 39±1 | 40±1 | 39±1 | 37±1 | 39±1 | 35±1 | 40±1 | ||
| Roll size |
roll width | 2m | 2m | 2m | 2m | 2m | |||||
| roll length | 50m | ||||||||||
# Geogrid ultimate tensile strength
Test Researcher Reliability Evaluation Report (Feb , 2018)
| Name | Method | Reinforcement Material |
Coating Material | Wide Tension Strength/Strain rate (kN/m) (t/m) | Reduction coefficient | |||
|---|---|---|---|---|---|---|---|---|
| Slope direction | Weft direction | RFCR | RFID | RFD | ||||
| bmk - 6t | Knit | PET | Urethane Acrylic | 88.50 | 35.00 | 1.78 | 1.12 | 1.10 |
| bmk - 8t | Knit | PET | Urethane Acrylic | 106.00 | 35.00 | 1.78 | 1.12 | 1.10 |
| bmk - 10t | Knit | PET | Urethane Acrylic | 126.40 | 35.00 | 1.77 | 1.12 | 1.10 |
| bmk - 15t | Knit | PET | Urethane Acrylic | 193.30 | 35.00 | 1.76 | 1.12 | 1.10 |
| Test method | KS K ISO 10319 or ASTM D 6637 | |||||||
| Test frequency | 3 specimens tests per 10,000㎡ | |||||||
| 6T | 8T | 10T | 15T | |
|---|---|---|---|---|
| Tensile Strength at 5% Elongation of PET Geogrid Based on FITI Testing Institute | 27 kN/m | 36 kN/m | 45 kN/m | 67.5 kN/m |
| Tensile strength at 5% elongation of BMK grid | 31.61 kN/m | 43.26 kN/m | 52.18 kN/m | 66.23 kN/m |
| BMK Grid long-term design tensile strength | 26.90 kN/m | 32.23 kN/m | 38.65 kN/m | 59.11 kN/m |
Tensile Strength at 5% Elongation > Long-term Design Tensile Strength
We do not use stiffeners with tensile strength equivalent to 5% of tensile strain less than the long-term tensile strength calculated by applying the strength reduction factor at design time. (Reinforced soil retaining wall for construction and maintenance provisional guidelines is attached / Jan 2013, Ministry of Land, Transport and Maritime Affairs)
