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GEOSYNTHETICS
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GEOSYNTHETICS
AFRICA

Biaxial Geogrids – Two-Direction Soil Reinforcement for Roads, Platforms & Foundations

Biaxial geogrids reinforce and stabilise soil in two directions beneath roads, working platforms and foundations. Choose from Tensar® SS (extruded polypropylene, 20–40 kN/m), MIRAGRID® GX Biaxial (knitted polyester, 20–80 kN/m) and TechGrid TGB (knitted polyester, 20–200 kN/m), supplied with engineering support across Africa.

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Technical Specification of Biaxial Geogrids – Two-Direction Soil Reinforcement for Roads, Platforms & Foundations

Biaxial geogrids provide tensile strength in both the machine and cross-machine directions, making them suited to applications where loads spread in several directions: stabilising granular layers beneath roads and pavements, building working platforms over weak subgrades, and reinforcing foundations.

Tensar® SS and TGSG geogrids are stiff, monolithic polypropylene grids with integral junctions, punched and drawn in two directions to give ribs with rectangular cross-sections and square edges that interlock efficiently with aggregate. Grades SS20–SS40 and TGSG2020–TGSG4040 offer minimum strengths of 20–40 kN/m in both directions, supplied in 3.8 m and 4.0 m wide rolls.

MIRAGRID® GX Biaxial geogrids are knitted in a flat orientation from high-modulus polyester fibres and protected by a polymeric coating. Designed for subgrade stabilisation and base reinforcement, grades from GX 20/20 to GX 80/80 offer equal strength in both directions, supplied in 5.2 m × 100 m rolls.

TechGrid TGB geogrids are made from high-tenacity, high-molecular-weight polyester yarns, formed into a stable grid with uniform apertures by weft-insertion warp knitting and finished with a durable polymeric coating. Grades from TGB-20 to TGB-200 cover unbound road bases, area stabilisation and track-bed reinforcement, supplied in 3.9 m or 5.1 m × 100 m rolls.

Stiff polypropylene grids interlock strongly with granular fill and are efficient for stabilising aggregate layers under traffic. Knitted polyester grids reach higher strengths with low creep, suiting heavier reinforcement such as platforms and embankments over soft ground. For heavily trafficked stabilisation, also consider Tensar® TriAx® and InterAx® geogrids. Our engineers can help select the right product and grade.

Typical Values for GEOGRIDS

Function
Reinforcement & Stabilisation · Two Directions
Products
Tensar® SS & TGSG · MIRAGRID® GX · TechGrid TGB
Polymer
PP · PET
Strength Range
20–200 kN/m (MD & CD, min)
Roll Width
3.8–5.2 m
Coverage
30+ African Countries · Engineering Support

Properties & Dimensions

PropertyTensar® SS & TGSGMIRAGRID® GX BiaxialTechGrid TGB
PolymerPPPETPET
StructurePunched & drawnKnitted, coatedKnitted, coated
GradesSS20–SS40 · TGSG2020–4040GX 20/20 – 80/80TGB-20 – TGB-200
Strength, MD & CD (min)20–40 kN/m20–80 kN/m20–200 kN/m
Strength at 2% strain (MD)7–14 kN/m4–15 kN/m4–30 kN/m
Strength at 5% strain (MD)14–28 kN/m7–27 kN/m7–55 kN/m
Aperture33–41 mm25 mm23–27 mm
Roll width 3.8 / 4.0 m5.2 m5.1
Roll length30–75 m100 m100 m
ApplicationsRoad bases, platformsSubgrade, road basesRoad bases, track-beds
Download Full Technical Datasheet for Biaxial Geogrids – Two-Direction Soil Reinforcement for Roads, Platforms & Foundations (PDF)

Popular Catalogue Items

Tensar® Biaxial (SS/TGSG) Geogrids

Tensar® Biaxial (SS/TGSG) Geogrids

Tensar® Biaxial (SS/TGSG) Geogrid: the original ground stabilisation geogrid, with over 500 million m² installed worldwide. Punched and drawn polypropylene with integral junctions that confine aggregate and stabilise weak subgrades under roads, working platforms and hardstands. Supplied across Africa by Geosynthetics Africa, an official Tensar Associate.
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Three Questions To Ask Before You Order

1.What is the difference between a biaxial and a uniaxial geogrid?
A biaxial geogrid has tensile strength in both the machine and cross-machine directions, suiting applications where loads spread in several directions, such as road bases, working platforms and foundations. A uniaxial geogrid carries its strength in one direction and is used for retaining walls, reinforced slopes and embankments.
2.Should I choose a polypropylene or a polyester biaxial geogrid?
Stiff polypropylene grids, such as Tensar® SS and TGSG, develop high stiffness at low strain and interlock strongly with aggregate, making them efficient for stabilising granular layers under traffic. Knitted polyester grids, such as MIRAGRID® GX and TechGrid TGB, reach higher strengths with low creep, suiting heavier reinforcement over soft ground. The right choice depends on the application, the fill and the design, and our engineers can help you decide.
3.How do biaxial geogrids compare with Tensar® TriAx® and InterAx®?
Biaxial geogrids have square or rectangular apertures with strength in two directions. Tensar® TriAx® and InterAx® use multi-directional geometries designed specifically to confine aggregate in trafficked applications. For roads, haul roads and platforms, a stabilisation design will show which option gives the best value for your project.
4.Where should the geogrid be placed in a pavement or platform?
The geogrid is usually placed at the interface between the subgrade and the first granular layer, or within the granular layer, as the design specifies. On very soft or wet subgrades, a nonwoven geotextile separator beneath the geogrid, or a composite geogrid, may also be needed to keep fines out of the aggregate.
5.What design life can I expect?
Design life depends on the polymer, soil temperature, fill pH and exposure during construction, and each manufacturer states its own basis. Warmer soils can shorten the assumed life of some products, which matters on many African sites. Check the conditions stated in each product datasheet and confirm the design life with your engineer.
6.Can one brand be substituted for another?
Yes, with the design engineer's approval. Equivalence should be checked on strength at 2% and 5% strain, aperture size relative to the aggregate, junction or node performance and, for stabilisation, performance-based design data, not on ultimate tensile strength alone. We can provide the datasheets needed for a substitution review.
7.Can biaxial geogrids be used for retaining walls or slopes?
Biaxial geogrids are sometimes used as secondary reinforcement near the face of walls and slopes, or for wrap-around facings. The main reinforcement in walls and slopes is normally a uniaxial geogrid, which carries higher strength in the direction of load.

Specification For The Design, Installation Of Biaxial Geogrids – Two-Direction Soil Reinforcement for Roads, Platforms & Foundations

Clear the subgrade of vegetation and sharp objects and grade it to the required level. On very soft or wet ground, place a separator geotextile first if the design requires one. Unroll the geogrid flat and taut, in the direction shown on the drawings.

Overlap adjacent rolls by 300 mm to 1 m, depending on subgrade strength and the manufacturer's guideline, with larger overlaps on weaker ground. Pin or weight the geogrid where needed to keep it flat while the fill is placed.

Keep tracked plant off the exposed geogrid. Place aggregate from the leading edge of previously placed fill and spread it forward, keeping at least 150 mm of cover before trafficking, then compact to the specified density. Always follow the manufacturer's installation guideline and the project specification. Our team provides on-site technical support on every project.

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