Reinforcing road bases on soft soils where gravel sinks and forms potholes in a few months, stabilizing commercial parking lots with vehicular loads dispersed in multiple directions, and reducing the thickness of expensive aggregate by saving excavation and backfill, requires extruded biaxial geogrid with tensile strength in two directions and calibrated apertures for aggregate interlock. This polypropylene (PP) biaxial geogrid—also called biaxial geogrid, biaxial geogrid or subgrade reinforcement mesh—is manufactured by MOLTEXO from extruded virgin PP and stretched in two directions with 40 kN/m strength, in 6 m wide and 50 m long rolls, designed for road construction, industrial platforms, commercial parking lots, and temporary access roads during construction.
Key Benefits
- Bidirectional strength for dispersed loads: stretching in both longitudinal and transverse directions produces a mesh with tensile strength in both directions, ideal for distributing vehicular and pedestrian loads coming from multiple angles onto the pavement.
- Mechanical interlock with granular aggregates: rigid apertures confine crushed stone and gravel ("interlock"), creating a pseudo-rigid aggregate layer with significantly higher bearing capacity than unbound aggregate, a mechanism that distinguishes an effective geogrid from a decorative plastic grid.
- Savings on calibrated aggregate: allows for a reduction in base and subbase thickness, depending on soft soil conditions and required project strength, resulting in significant savings on excavation, backfill, and costs in large-scale projects.
- Chemically inert and durable PP: resists biological degradation, chemical attack from soil acids and alkalis, environmental humidity, and typical Caribbean temperatures, conditions for a service life of decades when buried.
- Rapid deployment without specialized machinery: manageable roll that is spread over the subgrade with basic equipment, a condition that significantly reduces construction times compared to alternatives with cementation or chemical soil stabilization.
Typical Applications and Uses
- Reinforcement of bases and subbases for paved roads, unpaved roads, and industrial roadways with continuous traffic.
- Stabilization of commercial parking lots, marshalling yards, industrial platforms, and heavy equipment parking areas.
- Shallow foundations on soft, swampy, or low bearing capacity soils in residential and commercial projects.
- Temporary access roads for construction sites, mining operations, and work areas with inadequate natural soil.
Quality and Durability
An economical biaxial geogrid fails in two ways: the PP is not virgin but low-quality recycled (which causes abrasion and breakage due to interaction with aggregates during spreading and compaction) and the two-directional stretching is deficient with weak nodes (which significantly reduces the actual strength compared to the declared strength). MOLTEXO works with extruded virgin PP and controlled bidirectional stretching, which distinguishes an auditable structural geogrid for construction from a generic plastic grid that appears to reinforce but provides no real bearing capacity.
A complete functional difference. Biaxial is stretched in two directions (longitudinal and transverse) during manufacturing, which produces balanced strength in both directions: dispersed vehicle loads, platforms with traffic from multiple directions and road bases are its natural application. Uniaxial is stretched only longitudinally, with much higher strength in that direction and low transverse strength: mechanically stabilized earth (MSE) walls and reinforced slopes, where the tensile force runs in one direction perpendicular to the wall, are its application. Using uniaxial in pavement or biaxial in a wall produces structural failures.
Not directly on the biaxial grid. This technology works by mechanical interlock with granular aggregates (crushed stone, gravel, quarry stone) that lodge into the apertures and create a layer with improved load-bearing capacity. Asphalt and concrete are monolithic materials with no gradation able to interlock, so they don't deliver the reinforcement mechanism. The correct sequence: leveled subgrade → biaxial geogrid → compacted granular base layer → wearing course (asphalt, concrete or pavement). For reinforcement between asphalt layers themselves, specific asphalt geocomposites are used.
The savings depend on the specific soil study and structural design, but the typical range documented in technical literature is 30-50% reduction in aggregate-layer thickness vs. unreinforced construction, while keeping or improving load-bearing capacity. On large works (kilometers of road or hectares of platform) those savings translate into thousands of cubic meters less excavation and fill, plus a reduction in truck traffic. For a critical project, calculate the specific savings with soil engineering and check the economic case against geogrid cost.
Yes. Polypropylene is chemically inert against humidity, biological attack (fungi, bacteria), organic acids in soil, alkalis typical of calcareous Caribbean soils and most chemicals encountered in earthworks. The structure remains stable buried for decades without losing mechanical strength or structural properties. Critical points to verify for an auditable project: manufacturer certification with declared properties, no prolonged UV exposure before covering (cover within 14-21 days), and chemical compatibility with atypical soils such as those contaminated with hydrocarbons in industrial zones.
Angular granular material such as crushed stone or quarry gravel, since the particle edges interlock physically with the rigid grid apertures, creating maximum mechanical confinement. Recommended aggregate size: gradation with maximum size approximately equal to the grid aperture and well-graded with enough fines for compaction. Rounded material like washed river gravel and fine sand without fines does not produce effective interlock and significantly reduces system performance. For specific projects, check gradation specs in the soil engineering report.
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| Material | Polypropylene |
|---|---|
| Minimum carbon black | 2 % — ASTM D4218 |
| Tensile strength @ 2% strain (MD/TD) | 14 / 14 kN/m (959 / 959 lb/ft) — ASTM D6637 |
| Tensile strength @ 5% strain (MD/TD) | 28 / 28 kN/m (1,919 / 1,919 lb/ft) — ASTM D6637 |
| Ultimate tensile strength (MD/TD) | 40 / 40 kN/m (2,741 / 2,741 lb/ft) — ASTM D6637 |
| Strain at ultimate strength (MD/TD) | 15 / 13 % — ASTM D6637 |
| Junction efficiency (MD/TD) | 93 / 93 % — GRI GG2 |
| Flexural stiffness (MD) | 3,500,000 mg·cm (48.6 oz·in) — ASTM D1388 |
| Aperture stability (MD) | 1,432 N·mm/° (12.67 lbf·in/°) — COE Method |
| Aperture dimension (MD/TD) | 30 / 30 mm (1.18 / 1.18 in) |
| UV protection | Yes (high) |
| Minimum rib thickness (MD/TD) | 2 / 1.5 mm (0.079 / 0.059 in) — ASTM D1777 |
| Roll: Width | 42.0 cm (16.54 in) |
|---|---|
| Roll: Height | 42.0 cm (16.54 in) |
| Roll: Depth | 600.0 cm (236.22 in) |
| Roll: Weight | 148.5 kg |
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