Overview
EN ISO 13426-2:2024 - Geotextiles and geotextile-related products - Strength of internal structural junctions - Part 2: Geocomposites (ISO 13426-2:2024) specifies index test methods to determine the strength of internal junctions in geocomposites and clay geosynthetic barriers. Adopted by CEN as a European Standard, this second edition updates the 2005 version and provides standardized procedures for peel and shear testing of junctions under different loading conditions.
Key topics and requirements
- Scope: Index tests for junction strength of all geocomposites and clay geosynthetic barriers.
- Test methods:
- Method A (Shear test): Delamination at specimen edges, clamping of opposing layers, tensile loading until shear or material failure.
- Method B (Peel test): Delamination at one edge, each component clamped separately, tensile loading until peel failure.
- Junction strength definition: Peak load recorded and reported per unit width (kN/m).
- Specimens and sampling:
- Sampling according to ISO 9862.
- Five specimens required per product, for machine and cross-machine directions and for each structural junction if multiple layers are present.
- Conditioning atmosphere: Standard testing atmosphere at (20 ± 2) °C and (65 ± 5) % RH per ISO 554; mass stability criteria defined.
- Apparatus and setup: Use a calibrated tensile testing machine and suitable clamps (referenced to ISO 7500-1 for machine calibration). Tests conducted at a constant rate of extension.
- Calculations and reporting: Junction strength reported as peak load per unit width; Clause 9 includes rules for handling multiple peak events (updated in this edition).
- Normative references: ISO 554, ISO 7500-1, ISO 9862, ISO 10318-1.
Applications and users
This standard is directly applicable to:
- Geosynthetic manufacturers - design validation and production quality control of geocomposites and clay geosynthetic barriers.
- Testing laboratories - routine and type testing of junction strength (shear/peel).
- Geotechnical and civil engineers, specifiers, and contractors - product selection, performance verification, and contractual acceptance testing for landfill liners, drainage composites, reinforcement membranes and related geotechnical installations.
- Standards and compliance teams - harmonizing test reports and ensuring conformity with EN/ISO requirements.
Related standards
- ISO 13426 series (other parts)
- ISO 554 - Standard atmospheres for conditioning/testing
- ISO 9862 - Sampling and preparation of test specimens
- ISO 7500-1 - Calibration/verification of tensile testing machines
- ISO 10318-1 - Geosynthetics terms and definitions
EN ISO 13426-2:2024 provides a consistent, reproducible basis for measuring and reporting junction strength in geocomposites, supporting reliable product comparison, specification and quality assurance in geotechnical projects.
