SIST EN ISO 25619-2:2015 PDF

Overview

EN ISO 25619-2:2015 (ISO 25619-2:2015) specifies an index test method for determining the short-term compression behaviour of geosynthetics. The standard defines how to measure short-term compressive strength and corresponding compressive strain of geosynthetic products (e.g., geotextiles, structured cores) under rapid compressive loading. It is intended for quality control and testing, not for structural design.

Key topics and technical requirements

• Scope: Index test for short-term compressive behaviour; useful after exposure to stress, liquids or light. Not for design.
• Principle: Apply compressive force perpendicular to specimen faces and record maximum stress and deformation (force vs displacement).
• Apparatus
  • Compression testing machine in accordance with ISO 7500-1, Class 2 or higher, with rigid, parallel platens.
  • Displacement measurement accurate to ±5% or ±0.1 mm, whichever is smaller.
  • Force sensor accurate to ±1%.
  • Data acquisition to record force and displacement to produce stress–strain curves.
• Specimens
  • Rectangular or square specimens, minimum 100 mm × 100 mm.
  • Specimen thickness (initial thickness) measured at a stress of 5 kPa.
  • Cut so base is normal to direction of compression; do not layer specimens to increase thickness.
  • At least five specimens; use a new specimen for each test.
• Conditioning: Standard atmosphere per ISO 554 (20 °C ± 2 °C, 65% ± 5% RH) before testing.
• Results and reporting
  • If maximum stress