Biaxial Geogrids

Rigid biaxial geogrids improve the performance of aggregate base course materials supporting paved and unpaved roadway surfaces, railway ballast and Mechanically Stabilised Earth (MSE) walls and slopes. Their integrally formed structure provides lateral stability of unbounded base courses by the interlocking of granular particles into the geogrid apertures, thus improving their vertical stress distribution characteristics. The reinforcement action of polypropylene geogrids is generated by the vertical stress causing both the aggregate and geogrid to deform. Roads and railways built with PP biaxial geogrids have increased load bearing capacity, a longer service life and reduced section thickness.

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Our biaxial geogrids are manufactured by extruding, punching, longitudinal and transverse stretching of polypropylene. This results in a geogrid with high flexural rigidity and high tensile modulus in both the longitudinal (MD) and transverse (TD) directions. Because polypropylene geogrids have excellent structural stability and strong mechanical interlock performance they are ideal for soil reinforcement.

The performance of unsealed and sealed roads is critically dependent on materials used. Research by the US Corps of Engineers has shown aggregate layers stabilised with PP geogrids deliver significant performance benefits to flexible road pavements and reduce surface rutting by up to 44% compared with non-stabilised aggregate. Incorporating geogrid into a road pavement could cut construction time and costs by up to 19% and delay the onset of pavement failure by controlling lateral and vertical displacement of aggregates from traffic loads. Geogrids also help to overcome shortages of quality quarried materials and natural gravels used for road construction.

Biaxial Geogrid Applications

• Base reinforcement &#; reduced lateral spreading of the base course
• Subgrade reinforcement &#; increased confinement leading to stiffer base
• Slope reinforcement
• Road pavements
• Mechanically Stabilised Earth embankment stabilization

Biaxial polypropylene geogrids are available with the following tensile strengths:
15/15kN/m   20/20kN/m  25/25kN/m  30/30kN/m   40/40kN/m   45/45kN/m   50/50kN/m

Specifications

Product AL AT WLR WTR tLR tTR tJ INFRAGRID 36 36 2.6 2.6 1.0 0.8 3.1 INFRAGRID 35 35 2.6 2.6 1.5 1.1 3.5 INFRAGRID 34 34 2.8 2.8 1.8 1.4 4.2 INFRAGRID 34 34 3.0 3.0 2.5 1.5 4.9 INFRAGRID 33 33 3.0 3.0 3.4 2.1 5.5 INFRAGRID 32 32 3.1 3.1 4.1 2.2 5.6 INFRAGRID 30 30 3.1 3.1 4.3 2.5 5.8

*unit=mm

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Biaxial PP Geogrid INFRAGRID

Index Properties Test Method Units MD Values TD Values Polymer &#; &#; PP &#; Minimum Carbon Black ASTM D % 2 &#; Tensile Strength @ 2% Strain ASTM D kN/m(lb/ft) 7(480) 7(480) Tensile Strength @ 5% Strain ASTM D kN/m(lb/ft) 14(960) 14(960) Ultimate Tensile Strength ASTM D kN/m(lb/ft) 20(1,370) 20(1,370) Strain @ Ultimate Strength ASTM D % 13 13 Structural Integrity Junction Efficiency GRI GG2 % 93 93 Flexural Rigidity ASTM D mg-cm 750,000 &#; Aperture Stability COE Method m-N/deg 0.50 &#;

A biaxial geogrid is a geosynthetic material designed with soil reinforcement in two orthogonal directions: longitudinal and transverse. This has a high tensile strength in both axes, and its versatility is therefore suitable for many applications in civil engineering. Such geogrids are manufactured using materials such as polypropylene, polyester, or HDPE, thus providing durability and performance for any project requirements.

High-molecular-weight polyester (PET) yarns biaxial geogrids are produced at Strata Global, which are knitted with care and coated with a proprietary formulation. Such construction provides excellent tensile strength, resistance to environmental conditions, and better load distribution. By increasing the modulus values of base layers, biaxial geogrids reduce the requirement for excess fill material, saving costs and providing for more efficient construction processes.

Biaxial geogrids are popularly applied in challenging construction sites for soil reinforcement and stabilization. They are used in applications where soil needs to be reinforced in two dimensions for load distribution and tensile strength. The applications include:

• Soft soil embankments: Soft, compressible soils are strengthened as they settle and deform.
• Basal reinforcement: Support provision under embankments and foundations, especially for bridges and buildings.
• Flexible pavement or asphalt reinforcement: The improvement of structural road capacity looks for resistance against rutting and cracking.
• Load transfer platforms: Load distribution in structures like bridge abutments.
• Void spanning solutions: Stabilize potential areas of voids, for example, landfill caps or leachate collection ponds.

Through study of specific difficulties in soil mechanics, biaxial geogrids offer long-term stability and performance in such applications.

In conclusion, biaxial geogrids form one of the most essential parts in modern civil engineering work that offers excellent two-dimensional reinforcement and stability to the soil. Their versatility, low cost, and resistance to environmental factors make them one of the preferred options for applications involving slope stabilization as well as landfill stabilization. High-performance biaxial geogrids at Strata Global are designed to meet the stringent requirements of any construction project across the globe. Our biaxial geogrids ensure long-term durability and operational efficiency with customizable specifications and cutting-edge manufacturing techniques. Whether it is dealing with soft soils, granular materials, or difficult terrains, biaxial geogrids are the success formula.

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