Geogrids & Geocells
Geogrids
Geogrids are characterized by their large opening size. Some geogrids are made from punched sheets that are drawn to align the polymer molecules. Other geogrid constructions are formed by welding together oriented strands or by weaving or knitting yarns and coating them to form a grid configuration.
Biaxial Grid
Uniaxial Grid
Installation
SF SERIES SOIL REINFORCEMENT GEOGRID
The SF Series Geogrid is composed of high-tenacity multifilament yarns of high molecular weight polyester that are woven into a stable network placed in tension. The high strength polyester yarns are coated with a PVC material. SF Geogrids are inert to biological degradation and are resistant to naturally encountered chemicals, alkalis and acids. SF Geogrids are typically used for soil reinforcement applications such as retaining walls, steepened slopes, embankments, sub-grade stabilization, embankments over soft soils, and waste containment applications.
The flexibility in both manufacturing and product selection makes SF Geogrids "the next generation" of polyester soil enforcement grids.
The standard geogrids product range, combined with STF's ability to manufacture specialty site specific geogrids allows the engineer flexibility in the design of soil reinforcement structures. For example, SF Geogrids would aid in the design of a void bridging application where tensile strength requirements are high in both directions of the geogrid.
Installation of SF Geogrid is quick and easy. Because of the product's light weight and flexibity, no special tools or equipment are required. Simply, lay out the geogrid, measure it to the required length, and cut it with a utility knife or scissors. When installed, SF Geogrid lays flat. It will not recoil, even in cold weather.
PAVEMENT STRUCTURES
SYNTEEN BASE COURSE REINFORCEMENT
SUBGRADE IMPROVEMENT BIAXIAL GEOGRID
SF 11 is composed of high molecular weight, high tenacity multifilament polyester yarns that are woven into a stable network placed under tension. The high strength polyester yarns are coated with a polymer coating. SF Geogrids are inert to biological degradation and are resistant to naturally encountered chemicals, alkalis and acids.
SF11 INCREASES THE SERVICE LIFE OF PAVEMENT STRUCTURES BY IMPROVING:
CONFINEMENT OF BASE COURSE
Prevents lateral spreading of the base or sub-base aggregate
Allows for shear interaction to develop between the aggregate and the geogrid
TENSILE STRENGTH OF AGGREGATE
SF 11 geogrid will reduce applied vertical pressure of heavy loads at depth of aggregate by spreading the load over a wider area.
SF11
REINFORCEMENT PROPERTIES |
TEST METHOD |
MARV VALUES lbs/ft kN/m |
||
Ultimate Strength |
MD XMD |
ASTM-6637 |
2388 3870 |
34.9 56.5 |
Initial Modulus |
MD XMD |
ASTM-6637 |
178,000 172,900 |
2598 2524 |
Load at 2% Strain |
MD XMD |
ASTM-6637 |
526 578 |
7.68 8.43 |
Load at 5% Strain |
MD XMD |
ASTM-6637 |
1042 792 |
15.2 11.5 |
True in place strength after site damage testing based on TRI method of "installation" damage testing with coarse gravel (GP) and sandy gravel (SW). |
||||
Load at 2% Strain |
MD (GP) MD (SW) |
ASTM 6637 + ASTM-5818 |
401 490 |
5.8 6.5 |
Load at 2% Strain |
XMD (GP) XMD (SW) |
ASTM 6637 + ASTM-5818 |
521 570 |
7.6 8.3 |
Load at 5% Strain |
MD (GP) MD (SW) |
ASTM 6637 + ASTM-5818 |
795 972 |
11.6 14.1 |
Load at 5 % Strain |
XMD (GP) XMD (SW) |
ASTM 6637 + ASTM-5818 |
715 781 |
10.4 11.4 |
Coefficient of Pullout Interaction |
ASTM-6706 Sandy Gravel Sand |
Ci = 1.0 Ci = 1.0 |
||
Aperture Size* |
Measured |
MD 1.0 in. XD 1.0 in. |
SF12
REINFORCEMENT PROPERTIES |
TEST METHOD |
MARV VALUES lbs/ft kN/m |
||
Ultimate Strength |
MD XMD |
ASTM-6637 |
2388 5268 |
34.9 76.8 |
Initial Modulus |
MD XMD |
ASTM-6637 |
178,000 235,000 |
2598 3432 |
Load at 2% Strain |
MD XMD |
ASTM-6637 |
526 797 |
7.7 11.6 |
Load at 5% Strain |
MD XMD |
ASTM-6637 |
1042 1367 |
15.2 19.9 |
True in place strength after site damage testing based on TRI method of "installation" damage testing with coarse gravel (GP) and sandy gravel (SW). |
||||
Load at 2% Strain |
MD (GP) MD (SW) |
ASTM 6637 + ASTM 5818 |
438 496 |
6.3 7.2 |
Load at 2% Strain |
XMD (GP) XMD (SW) |
ASTM 6637 + ASTM-5818 |
664 752 |
9.7 11.0 |
Load at 5% Strain |
MD (GP) MD (SW) |
ASTM 6637 + ASTM-5818 |
868 983 |
12.6 14.3 |
Load at 5 % Strain |
XMD (GP) XMD (SW) |
ASTM 6637 + ASTM-5818 |
940 1065 |
13.7 15.5 |
Coefficient of Pullout Interaction |
ASTM 6706 Sandy Gravel Sand |
Ci= 1.0 Ci= 1.0 |
||
Aperture Size |
Measured |
MD 1.0 in. XD 1.0 in. |