Building retaining walls with reinforced soil and high slopes as a safe and economical alternative to traditional reinforced concrete, where the tensile force of the backfill runs perpendicular to the wall, requires uniaxial geogrid with high tensile strength in one direction, low creep, and rigid nodes. This polypropylene (PP) uniaxial geogrid —also called uniaxial geogrid, mono-oriented geogrid, or MSE reinforcement mesh— is manufactured by MOLTEXO from PP stretched in one direction with a strength of 80 kN/m, in a 3 m wide and 100 m long roll, designed for mechanically stabilized earth (MSE) walls, reinforced slopes, landslide-prone slope stabilization, and bridge abutments.
Key Benefits
- High directional strength for walls and slopes: Longitudinal stretching during manufacturing produces remarkably high tensile strength in the roll direction, a critical condition for MSE walls where the geogrid must withstand the pressure of the backfill for decades.
- Low creep for extended service life: The PP formulation and molecular orientation process minimize deformation under sustained load, an auditable condition for walls with a declared design life of decades that do not allow for progressive movement.
- Interlock with granular and cohesive backfill: Calibrated apertures allow for the embedment of angular aggregates and compatibility with cohesive soils under engineered design, expanding the versatility of usable backfill materials.
- Chemical and biological resistance for underground works: PP withstands moisture, acids, alkalis, and soil microorganisms for years, typical conditions in buried walls and saturated backfills.
- Economical alternative to reinforced concrete: MSE walls built with uniaxial geogrid significantly reduce the cost of traditional retaining walls, while maintaining or exceeding structural safety through engineered design.
Typical Applications and Uses
- Mechanically stabilized earth (MSE) walls for road, urban, and residential containment up to several meters high.
- Steep slopes and reinforced embankments in road and urban development projects on complex topography.
- Stabilization of landslide-prone slopes, especially in tropical areas with intense seasonal rainfall.
- Small bridge abutments and access ramps in road works with reinforced soil as a structural solution.
Quality and Durability
An economical uniaxial geogrid fails in two areas: creep under continuous loads is high (leading to progressive wall deformations over years with structural consequences) and directional stretching is deficient with actual strength significantly lower than declared (invalidating project engineering calculations). MOLTEXO works with stretched PP with low creep and auditable strength of 80 kN/m, which separates a safe structural MSE wall uniaxial geogrid from a mesh with a label that does not perform in critical structures.
A complete functional difference that defines which product goes where. The uniaxial is stretched only longitudinally with high strength in that direction and low transverse strength — exactly what's needed for mechanically stabilized earth (MSE) walls, where the backfill thrust pushes perpendicular to the wall and the grid must resist that tension in a single direction. The biaxial is stretched in both directions for road-base reinforcement with loads dispersed in multiple angles. Using uniaxial in pavement only reinforces a single direction of traffic; using biaxial in an MSE wall produces a wall with insufficient strength in the critical thrust direction.
It works best with angular granular soils and crushed aggregates that physically interlock with the geogrid apertures, creating maximum confinement. It is also compatible with cohesive soils (clays, clayey silts) under engineering design with verified properties — a necessary condition on sites where the available backfill is not ideal but cost optimization matters. For MSE walls it's worth following the structural designer's specifications regarding gradation, plasticity and compaction of the fill, since the wall calculation depends on the grid-soil interaction. Dust and vegetable contaminants are removed before backfilling.
The geogrid is laid perpendicular to the face of the wall, with the high-strength direction (roll direction, longitudinal) extending into the slope, not parallel to the wall. This orientation lets the grid resist the tension generated by the horizontal thrust of the backfill toward the outer face. The material should go down without wrinkles or folds, with light tension to keep it flat as the upper backfill is spread. The length anchored into the slope (embedment length) is a design parameter that follows the wall engineering and depends on height, external loads and soil properties.
Yes. Polypropylene is highly resistant to moisture, biological attack (fungi, bacteria, roots), organic soil acids, alkalis typical of calcareous Caribbean soils and most chemicals typical of underground works. The structure remains stable for decades without losing strength or structural properties. The points to verify for MSE wall auditing: manufacturer certification with declared strength and creep, no prolonged UV exposure (cover within 14-21 days), and compatibility with atypical soils such as those contaminated with hydrocarbons. For industrial zones with specific chemicals it's worth reviewing the chemical compatibility table.
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| Material | Polypropylene (PP) |
|---|---|
| Yield tensile strength | ≥80 kN/m (≥5,482 lb/ft) — GB/T17689-2008 |
| Yield elongation | ≤10 % — GB/T17689-2008 |
| Tensile force at 2% elongation | ≥26 kN/m (≥1,782 lb/ft) — GB/T17689-2008 |
| Tensile force at 5% elongation | ≥48 kN/m (≥3,289 lb/ft) — GB/T17689-2008 |
| UV protection | Yes (high) |
| Roll: Width | 38.0 cm (14.96 in) |
|---|---|
| Roll: Height | 38.0 cm (14.96 in) |
| Roll: Depth | 300.0 cm (118.11 in) |
| Roll: Weight | 29.0 kg |
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