Geogrid Construction for Highway Projects: Installation Procedures and Technical Considerations

Construction Process

1. Pre-Construction Preparation

• Material Inspection:

• Verify tensile strength (MD: ≥50kN/m, TD: ≥40kN/m per ASTM D6637)

• Check for UV stabilization (≤5% strength loss after 2000 hrs exposure)

• Site Preparation:

• Achieve 95% Standard Proctor density

• Remove all objects >25mm in diameter

• Survey Layout:

• Establish control points with ±30mm tolerance

2. Installation Procedures

• Orientation:

• Primary direction: Transverse to centerline

• Curve sections: Radial alignment with 5° maximum deviation

• Deployment:

• Maintain 1-2% prestress during unrolling

• Use sandbag anchors (@ 2m intervals) for temporary fixing

• Connection Methods:

  Type	Specification
  Overlap	300mm minimum
  Mechanical	4 connectors/m²
  Thermal	400°C weld temperature

3. Backfilling Protocol

• Material Requirements:

• Maximum particle size: 1/3 layer thickness

• Plasticity Index: <15

• Compaction Standards:

• 200mm lifts

• 92-95% relative compaction

Critical Construction Considerations

1. Damage Prevention

• Handling Protocols:

• Forklift spreaders with rubber-coated tines

• Prohibit equipment >10kPa ground pressure

• Workforce PPE:

• Soft-soled shoes mandatory

2. Environmental Controls

• Weather Restrictions:

• Wind: <25km/h

• Temperature: 5-40°C

• Drainage Measures:

• Slope: 2% minimum

• French drains @ 20m intervals

3. Quality Assurance

• Inspection Checklist:

• Seam continuity (no visible gaps)

• Anchorage integrity (≥500N pullout resistance)

• Testing Frequency:

• 1 test/500m² for tensile properties

Performance Data

▸ Bearing Capacity Improvement: 40-60%
▸ Construction Rate: 800-1200m²/day
▸ Service Life: 30+ years

Title: "Highway Geogrid Reinforcement: Best Practices for Subgrade Stabilization"

Key Benefits:
✔ Rut Resistance: Reduces deformation by 70%
✔ Cost Efficiency: $3-6/m² installed
✔ Sustainability: 50% aggregate savings

Standards Compliance:

• AASHTO M288 - Material specifications

• FHWA-NHI-07-092 - Design guidelines

• ISO 10320 - Identification standards