GEOTEXTILE

Geotextile

1. Purpose & BenefitsGeotextiles in highway construction provide:
✔ Separation – Prevents mixing of subgrade and aggregate layers
✔ Filtration – Allows water drainage while retaining soil particles
✔ Reinforcement – Improves load distribution (up to 30% increased bearing capacity)
✔ Erosion control – Reduces washout under pavement edges
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2. Material Selection

Parameter	Highway-Grade Requirements	Test Standard
Type	Nonwoven (NW) or Woven (W)	ASTM D4439
Mass per Unit Area	200–400 g/m² (NW), 150–300 g/m² (W)	ASTM D5261
Tensile Strength	≥20 kN/m (MD), ≥15 kN/m (XD)	ASTM D4632
Puncture Resistance	≥500 N	ASTM D6241
Permittivity	≥0.1 sec⁻¹	ASTM D4491

Recommended Products:

AASHTO M288 Class 1 (for separation/filtration)
AASHTO M288 Class 2 (for high-stress areas)

3. Construction Steps

3.1 Subgrade Preparation

✔ Compact subgrade to 95% Proctor density
✔ Remove sharp objects (>3mm stones, roots)
✔ Grade to design slope (typically 1–2% cross slope)

3.2 Geotextile Deployment

Unroll parallel to centerline (minimize transverse seams)
Overlap seams:

Longitudinal: 300–600mm
Transverse: 1000–1500mm

Anchoring:

Use U-pins (every 1–2m) on slopes
Trench edges at pavement boundaries

3.3 Aggregate Placement

First lift thickness: ≤150mm (protects geotextile)
Compaction: Vibratory roller (3–5 passes)
Avoid:

Direct equipment traffic on exposed geotextile
Drag loading of sharp-edged aggregates

4. Quality Control

Checkpoint	Method	Acceptance Criteria
Seam continuity	Visual	No gaps >50mm
Material damage	Inspection	≤3 punctures per 100m²
Placement alignment	Survey	±50mm from design position

5. Performance Advantages

Application	Benefit
Base course separation	Reduces aggregate loss by 40%
Soft subgrade stabilization	Increases CBR by 2–3 points
Pavement edge protection	Prevents shoulder erosion

6. Common Mistakes to Avoid

✖ Insufficient overlaps (causes soil intrusion)
✖ Improper anchoring on slopes (leads to wrinkles)
✖ Aggregate drop height >1m (causes geotextile puncture)

Regulatory Compliance:
✔ AASHTO M288 (Geotextile Specification)
✔ FHWA-NHI-05-037 (Roadway Design Manual)

Keywords: Highway geotextile, Pavement separation layer, Road base stabilization, Erosion control fabric

Need project support? We provide:
→ Site-specific installation drawings
→ Non-destructive seam testing
→ Construction supervision

(This protocol complies with ASTM, AASHTO, and FHWA standards for highway works)

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