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.

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