Biaxial geogrid composite geotextiles for roadbed reinforcement

Why Biaxial Geogrid Composite Geotextile is Ideal for Subgrade Reinforcement

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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
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
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
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)