ISO and Related Standards for Geosynthetic Drainage Composites
Geosynthetic drainage composite is evaluated under key standards to ensure optimal performance in drainage and filtration applications:
- EN ISO 12958:2020: Measures in-plane flow capacity (transmissivity) under specified pressures (e.g., 20 kPa) and hydraulic gradients (e.g., 1.0), confirming the composite’s ability to handle 0.7 L/(m·s) flow. This standard is critical for drainage geocomposites.
- EN ISO 10319:2015: Determines tensile strength (13.5 kN/m for the composite, 8.0 kN/m for the geotextile) and elongation, tested using a 200 mm wide strip at controlled conditions (20°C ± 2°C, 65% ± 5% humidity).
- EN ISO 11058:2019: Assesses permeability normal to the plane, ensuring the geotextile’s filtration efficiency, typically with pore sizes of 75–150 microns for nonwoven geotextiles.
- ASTM D4716/D4716M-20: Complements ISO 12958 for in-plane flow testing, often used in North American applications.
- EN 13252:2016: Specifies characteristics for geotextiles in drainage systems, ensuring compatibility with soil retention and permeability requirements.
The composite features a thermobonded HDPE geonet core with a rhomboidal structure, enhancing in-plane flow, combined with a polyethylene film and a nonwoven geotextile (130 g/m², 8.0 kN/m tensile strength). The total mass per unit area is 830 g/m², and the system is UV-stabilized for durability during installation, as supported by industry practices. Applications include landfill leachate collection, road drainage, and retaining wall drainage.
Detailed Specifications
| Core Structure | Geotextile Mass per Unit Area (g/m²) | Geotextile Tensile Strength (kN/m) | Total Tensile Strength (kN/m) | In-Plane Flow Capacity (L/m·s) | Total Mass per Unit Area (g/m²) | Material | Typical Applications | Test Standards |
|---|---|---|---|---|---|---|---|---|
| HDPE Geonet (Rhomboidal) | 130 | 8.0 | 13.5 | 0.7 (at 20 kPa, i=1.0) | 830 | HDPE Geonet + PE Film + PP Nonwoven | Landfill drainage, road base, retaining walls | EN ISO 12958:2020, EN ISO 10319:2015, EN ISO 11058:2019 |
Geosynthetic drainage composite offers a lightweight, high-efficiency alternative to traditional drainage systems, providing superior in-plane flow and filtration for critical infrastructure projects.
ISO and Related Standards
The webpage references key standards for geosynthetic drainage composites:
- EN ISO 12958:2020: Measures in-plane flow capacity (transmissivity) at 20 kPa and hydraulic gradient of 1.0, confirming the 0.7 L/m·s flow capacity, critical for drainage performance.
- EN ISO 10319:2015: Tests tensile strength (13.5 kN/m for the composite, 8.0 kN/m for the geotextile) and elongation using a 200 mm wide strip at 20°C ± 2°C and 65% ± 5% humidity.
- EN ISO 11058:2019: Assesses normal permeability, ensuring filtration efficiency (typical pore size for 130 g/m² nonwoven geotextiles is 75–150 microns, per industry norms).
- ASTM D4716/D4716M-20: Complements ISO 12958 for in-plane flow testing, widely used in North America.
- EN 13252:2016: Specifies requirements for geotextiles in drainage systems, ensuring soil retention and permeability.
Table Notes
- Specifications:
- Core Structure: HDPE geonet with two sets of parallel overlaid ribs in a rhomboidal shape, enhancing in-plane flow.
- Geotextile Mass per Unit Area: 130 g/m², typical for lightweight nonwoven polypropylene geotextiles.
- Geotextile Tensile Strength: 8.0 kN/m, contributing to the composite’s total strength of 13.5 kN/m.
- In-Plane Flow Capacity: 0.7 L/m·s at 20 kPa and hydraulic gradient of 1.0, per EN ISO 12958:2020.
- Total Mass per Unit Area: 830 g/m², including the HDPE geonet, polyethylene film, and nonwoven geotextile.
- Material: Combination of HDPE geonet, polyethylene film, and polypropylene nonwoven geotextile, thermobonded for stability.
- Applications: Landfill drainage, road base stabilization, and retaining wall drainage, leveraging efficient flow and filtration.
- UV Stabilization: The polyethylene film and geotextile are typically UV-stabilized with additives like carbon black to prevent degradation during installation.
- Pore Size: Not specified but assumed to be 75–150 microns for a 130 g/m² nonwoven geotextile, based on industry standards and filtration requirements.
Additional Notes
Comparison: The table focuses on a single product, as only one specification was provided. The chart visualizes key performance metrics for clarity.
Thermobonding: Ensures a strong bond between the HDPE geonet, polyethylene film, and geotextile, enhancing structural integrity.
Rhomboidal Geonet: The overlaid ribs improve flow efficiency compared to traditional drainage layers, offering a lightweight alternative (e.g., a 5–8 mm composite can replace 200–300 mm of gravel).