Technical Specification: Biaxial Geogrid-Geotextile Composite for Highway Subgrade Reinforcement

Project Overview
For your highway construction project, our biaxial geogrid-geotextile composite offers an integrated solution that combines the tensile strength of geogrids with the separation/filtration functions of geotextiles. This dual functionality ensures long-term subgrade stability while optimizing construction efficiency.

Material Composition

  • Geogrid: High-density polypropylene (PP) biaxial geogrid with 30mm x 30mm apertures, tensile strength ≥30kN/m (MD & XD)
  • Geotextile: Non-woven polypropylene fabric (200g/m²), puncture resistance ≥800N, permeability 20-30 l/m²/s
  • Bonding: Automatic temperature control heating to bonding system.

Advantages of Feicheng Lianyi’s Biaxial Geogrid Composite

Absolutely! A biaxial geogrid composite geotextile is an optimal solution for subgrade reinforcement, particularly in highway construction, due to its dual functionality of load distribution (via the geogrid) and soil separation/filtration (via the geotextile). Below’s a detailed breakdown of its advantages, working principles, and application guidelines;

Why Biaxial Geogrid Composite Geotextile is Ideal for Subgrade Reinforcement

1. Synergistic Engineering Benefits

  • Biaxial Geogrid Core:
    • Provides equal tensile strength in both longitudinal and transverse directions (e.g., 30–50 kN/m), ideal for multidirectional traffic loads.
    • Aperture geometry (e.g., 25mm×25mm) interlocks with aggregate, creating a stiffened platform that increases subgrade bearing capacity by 3–5x (CBR improvement from 2 to 8–10).
  • Geotextile Layer:
    • Acts as a separator to prevent fine soil particles from mixing with the aggregate base.
    • Filters water while maintaining permeability (20–30 L/m²/s), crucial for drainage in high-water-table or rainy conditions.

2. Problem-Solving Capabilities

  • Reduces Differential Settlement:
    Distributes concentrated loads over a wider area, cutting uneven settlement by 60–80% in weak soils (e.g., sandy or clayey subgrades).
  • Prevents Reflective Cracking:
    Absorbs cyclic stresses from traffic, reducing crack propagation from subgrade to pavement surface.
  • Cost Efficiency:
    Lowers aggregate layer thickness by 30–50%, saving material and excavation costs.

Key Performance Advantages

  1. Subgrade Stabilization
  • Reduces differential settlement by 60-80% through load distribution over 1.5-2.0m depth
  • Increases California Bearing Ratio (CBR) from 2-3 to 8-10, enabling thinner pavement layers
  • Prevents reflective cracking by absorbing 90%+ of cyclic traffic stresses
  1. Separation & Filtration
  • Prevents fine soil migration into aggregate base (retention efficiency >95%)
  • Maintains drainage capacity even under 500kPa pressure (permeability loss <10%)
  • Eliminates mud-pumping in high groundwater conditions
  1. Construction Efficiency
  • Pre-assembled composite reduces installation time by 40% vs. separate layers
  • Roll dimensions: 5.0m width x 50m length, minimizing overlaps (10cm side/20cm end)
  • UV-stabilized for 6-month exposure without degradation

Installation Guidelines
1. Site Preparation

  • Compact subgrade to 95% Proctor density
  • Remove sharp protrusions (>5mm) to prevent geotextile puncture
  • Ensure uniform moisture content (±2% of OMC)

2. Material Deployment

  • Unroll geogrid side up (marked surface)
  • Maintain 1-2% overlap tension to prevent wrinkles
  • Use U-shaped pins (Φ6mm x 300mm) at 1.5m intervals for temporary fixing

3. Aggregate Placement

  • Initial layer: 10-15cm crushed stone (20-40mm gradation)
  • Compact with vibratory roller (8-10 passes at 2-4km/h)
  • Avoid direct equipment traffic on exposed composite

4. Quality Control

  • Verify tensile strength (ASTM D6637) and junction efficiency (>90%)
  • Check overlap integrity (≥30cm) and anchorage length (≥1.0m at slopes)
  • Monitor aggregate placement to prevent segregation

Climate Adaptation for Arabian Conditions

  • Temperature Resistance: Withstands -30°C to +80°C (tested per ASTM D5321)
  • UV Protection: Carbon-black stabilized for 2000+ hours UV exposure (ISO 4892-2)
  • Chemical Inertness: Resists saline/alkaline soils (pH 3-11)

Case Study: Riyadh-Dammam Highway Expansion

  • Challenge: Soft clay subgrade with CBR<2, high groundwater table
  • Solution: 1.2m thick reinforced embankment using our composite
  • Results:
    • Zero settlement after 5 years under 10,000+ AADT
    • 30% cost savings vs. deep soil replacement
    • Construction completed 3 months ahead of schedule

Maintenance Considerations

  • Routine inspections for surface rutting (>25mm)
  • Drainage system cleaning to prevent waterlogging
  • Vegetation control near slopes (root penetration <5mm/year)

Why Choose Feicheng Lianyi?

  • 15+ years of Middle East project experience
  • Customizable roll sizes for your project’s specific needs
  • On-site technical support during installation
  • Compliance with Saudi SASO, UAE ES, and ASTM/EN standards