Geogrids reinforce low-bearing capacity soils or high walls and slopes. The choice between biaxial, triaxial, and uniaxial is not a nuance: each is calibrated for a distinct structural function (bidirectional base reinforcement, multidirectional platform reinforcement, or directional MSE wall reinforcement). This comparison of the three MOLTEXO geogrids helps you decide which one fits your engineering project.
🎯 Choose in 10 seconds
- If you are reinforcing road bases, parking lots, and platforms with vehicular loads in two directions: go to Biaxial Geogrid
- If you are stabilizing soft soils with multidirectional loads and require the additional performance of triaxial: go to Triaxial Geogrid
- If you are building retaining walls (MSE), reinforced slopes, and bridge abutments with directional tension: go to Uniaxial Geogrid
What to consider before choosing
Before purchasing, evaluate these four criteria. They define whether the geogrid provides the calculated structural performance or compromises project safety.
- Project structural function: bidirectional base reinforcement (biaxial), omnidirectional confinement under multidirectional loads (triaxial), or directional reinforcement of MSE walls with tension perpendicular to the wall (uniaxial). Each geogrid is calibrated for its function — using biaxial in an MSE wall invalidates project calculations.
- Tensile strength and direction: biaxial 40 kN/m bidirectional for distributing loads in bases; triaxial 10 kN/m with confinement in three directions for stabilizing dispersed loads; uniaxial 80 kN/m directional for supporting backfill thrust in walls and slopes. Strength must match engineer's calculations.
- Fill and aggregate type: all work with crushed stone, gravel, and cohesive soil under design, but with different efficiencies. Triaxial provides better confinement with angular aggregate due to its triangular apertures; biaxial works with aggregate and cohesive soil; uniaxial allows interlocking with aggregate or soil under engineering design.
- Creep and service life: MSE walls require low creep so that the structure does not progressively deform over the years — uniaxial is calibrated for low creep. Road bases and platforms have lower creep requirements and work well with biaxial or triaxial. MOLTEXO virgin PP maintains toughness for decades.
Biaxial geogrid: bidirectional reinforcement for road bases
- Virgin extruded and biaxially drawn PP
- 40 kN/m bidirectional strength
- Mechanical interlocking with aggregate in rigid apertures
- Reduction of aggregate base thickness vs. traditional solution
- Rapid deployment without specialized machinery
- Not optimized for multidirectional loads (use triaxial)
- Not suitable for MSE walls (use uniaxial)
Roll of biaxial geogrid made of virgin polypropylene (PP), extruded and biaxially drawn, 40 kN/m strength, 6 m (19.7 ft) wide and 50 m (164 ft) long. Designed for reinforcing bases and subbases of paved roads, unpaved roads, and industrial roads with continuous traffic; stabilizing commercial parking lots, maneuvering yards, and industrial platforms; shallow foundations on soft soils in residential and commercial projects; temporary access roads in construction sites and mining operations.
Triaxial geogrid: omnidirectional confinement
- Triangular geometry with strength in three directions (0°, 60°, 120°)
- Omnidirectional confinement superior to biaxial
- Additional optimization of aggregate base thickness
- Inert structural PP for underground work
- Compatible with all granular aggregate and natural soil
- Higher unit cost than biaxial (justified for multidirectional loads)
- 10 kN/m strength: complements geometry, does not replace it
Roll of triaxial geogrid made of structural polypropylene (PP) with 10 kN/m strength, 3.95 m (13 ft) wide and 50 m (164 ft) long. Triangular structure extended in three directions for multidirectional load distribution. Designed for reinforcing bases and subbases of roads, unpaved roads, and industrial routes with heavy vehicular traffic; stabilizing industrial platforms, commercial parking lots, and maneuvering yards with continuous loads; foundations on swampy, clayey, and low-bearing capacity soils; landing strips in small airports and railways.
Uniaxial geogrid: directional reinforcement for walls and slopes
- Directionally drawn PP with 80 kN/m strength
- Low creep for extended wall service life
- Auditable strength for engineering design
- Interlocking with granular and cohesive fill
- Economical alternative to traditional reinforced concrete
- Directional strength: critical orientation during construction
- Not suitable for base reinforcement (use biaxial or triaxial)
Roll of uniaxial geogrid made of polypropylene (PP) drawn in one direction with 80 kN/m strength, 3 m (9.8 ft) wide and 100 m (328 ft) long. Designed for mechanically stabilized earth (MSE) walls in road, urban, and residential containment; steep slopes and reinforced embankments in road and urban development projects; stabilization of hillsides at risk of landslides, especially in tropical areas with intense seasonal rainfall; small bridge abutments and access ramps in road projects with reinforced soil.
Comparative table
| Feature | Biaxial | Triaxial | Uniaxial |
|---|---|---|---|
| Structural function | Bidirectional reinforcement | Omnidirectional confinement | Directional reinforcement |
| Tensile strength | 40 kN/m (2.74 kip/ft) | 10 kN/m (0.7 kip/ft) | 80 kN/m (5.5 kip/ft) |
| Working directions | Two (longitudinal and transverse) | Three (0°, 60°, 120°) | One (longitudinal) |
| Main application | Road bases, parking lots | Platforms with multidirectional loads | MSE walls, slopes, abutments |
| Material | Virgin extruded PP | Structural PP | Directionally drawn PP |
| Roll width | 6 m (19.7 ft) | 3.95 m (13 ft) | 3 m (9.8 ft) |
| Roll length | 50 m (164 ft) | 50 m (164 ft) | 100 m (328 ft) |
| Creep | Standard | Standard | Low (calibrated for walls) |
Use case matrix → recommended product
| If your case is... | Recommended product |
|---|---|
| Road base reinforcement with bidirectional vehicular traffic | → Biaxial Geogrid |
| Commercial parking lot on soft soil with vehicular loads | → Biaxial Geogrid |
| Industrial platform with heavy equipment traffic in two directions | → Biaxial Geogrid |
| Temporary road on a construction site over inadequate natural soil | → Biaxial Geogrid |
| Residential foundation on soft or swampy ground | → Biaxial Geogrid |
| Industrial platform with dispersed vehicular loads in multiple directions | → Triaxial geogrid |
| Stabilization of very soft soils with complex traffic | → Triaxial geogrid |
| Small airport runway with multi-directional loads | → Triaxial geogrid |
| Railway with dispersed loads in areas of low bearing capacity | → Triaxial geogrid |
| MSE retaining wall in a road or urban project several meters high | → Uniaxial geogrid |
| Steep slope or reinforced embankment in a road project | → Uniaxial geogrid |
| Slope stabilization with risk of landslide due to rain | → Uniaxial geogrid |
| Small bridge abutment with reinforced soil as a structural solution | → Uniaxial geogrid |
Before buying, define three pieces of information: the structural function (base reinforcement, confinement, or MSE wall), the direction of the loads (one, two, or multiple axes), and the tensile strength required by the engineering calculation. The practical rule: road bases and parking lots → biaxial; multi-directional loads on very soft soil → triaxial; walls and slopes with tensile forces perpendicular to the wall → uniaxial. For critical projects, always consult the structural engineer's calculation before purchasing.
Do not use biaxial or triaxial geogrids in structural MSE walls. These geogrids are not calibrated for low creep under sustained load, so the wall may progressively deform over the years. MSE walls require uniaxial geogrid with auditable creep. Conversely: using uniaxial in road bases wastes structural capacity in a direction that is not needed.
Not sure which geogrid your project requires?
If your project combines several structural functions (road base + retaining wall + slope stabilization) or has loads with complex directions, ask the virtual assistant with the details of the engineering calculation. You will receive an instant technical recommendation with the appropriate geogrid and strength.
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Frequently asked questions
Can I substitute one geogrid for another if I cannot find the calibrated one?
Not for structural projects. Each geogrid is calibrated for a specific function with specific engineering calculations: substituting uniaxial for biaxial in an MSE wall invalidates the project calculations and compromises structural safety. For non-critical projects, always consult with the structural engineer before making changes.
Does triaxial geogrid replace biaxial geogrid in road bases?
In conditions of very soft soil or complex multidirectional loads, triaxial offers additional performance that justifies its cost. In standard road base conditions with bidirectional traffic, biaxial remains the optimal option in terms of cost-benefit. The engineering calculation determines which one fits best.
How much does the use of geogrid reduce the aggregate base thickness?
It depends on the soil condition, the geogrid used, and the project loads. As a general reference, biaxial can allow significant reduction in base thickness; triaxial can provide additional reduction in very soft soil conditions. The specific calculation is always done by the structural engineer.