A vague or incorrect geotextile specification can lead to underperformance or unnecessary cost. For engineers and procurement managers, a systematic approach ensures the selected fabric meets exact project needs. Follow this step-by-step guide.
Step 1: Define the Primary Function(s)
Identify the main role from the core five: Separation, Filtration, Drainage, Reinforcement, or Protection. Many projects require a combination (e.g., separation + filtration for a road base). This dictates the fundamental fabric type.
Step 2: Analyze Site-Specific Conditions
Soil Properties: Grain size distribution (for determining required AOS), shear strength, moisture content.
Loading Conditions: Static vs. dynamic loads, magnitude, frequency (for determining required tensile strength and CBR puncture resistance).
Environmental Factors: UV exposure, chemical presence, temperature extremes (for determining durability requirements).
Step 3: Select Key Index and Performance Properties
Based on Steps 1 & 2, establish minimum values for:
Physical: Mass per unit area (weight), thickness.
Mechanical: Wide-width tensile strength, elongation, puncture, tear.
Hydraulic: Apparent Opening Size (AOS), permittivity/permeability.
Endurance: UV resistance, abrasion resistance.
Step 4: Reference Applicable Standards
Specify the exact ASTM, ISO, or EN test methods (e.g., "Tensile Strength: ≥ 80 kN/m as per ASTM D4595"). For EU projects, require CE marking and a Declaration of Performance.
Step 5: Develop the Procurement Specification
Compile the above into a clear document requiring:
Compliance with listed property values and test methods.
Submission of certified geotextile data sheets and mill test reports.
Roll dimensions (width, length).
Packaging and labeling requirements.
By following this process, you move from a generic product request to an engineered specification. Our technical team can assist in this process. We provide comprehensive data and custom solutions to match your precise specs. Contact us via www.hzgeotextile.com.
