Overview
ISO 13437:2019 - Geosynthetics: Installing and retrieving samples in the field for durability assessment - specifies a standardized method for on-site installation and retrieval of geosynthetic samples (retrieval samples and control specimens) to evaluate in-service durability and installation damage. The procedure is applicable regardless of the degradation mechanism and is intended to give owners, designers and testing laboratories reliable data on the condition of geosynthetic products in civil engineering structures.
Key Topics and Requirements
- Scope and principle: Compare properties of in-service geosynthetics with control specimens taken before installation to quantify degradation or installation damage.
- Identification of initial conditions: Record structure ID, geosynthetic description, environment, sample dimensions and test references (forms provided in Annex A).
- Durability testing samples & retrieval schedule:
- Prepare samples on delivery and take control specimens.
- First retrieval directly after construction, second after 10 years, then every 20 years (or sooner if required), and a final retrieval at end of service life.
- Number of samples depends on structure size, environmental variability and consequences of failure.
- Control specimen preparation and storage:
- Control specimens taken from delivered material per ISO 9862.
- Dimensions match durability samples; quantity equals scheduled retrievals.
- Storage recommended at 0 °C to 20 °C and 50 % to 65 % relative humidity.
- Retrieval procedure and site handling:
- Excavation: mechanical digger stopped before geosynthetic, manual removal over an area ~1 m²; avoid sample damage.
- Collect soil/medium samples in contact with geosynthetic (pH, chemistry, mechanical).
- Photograph and document visual condition (holes, tears, roots, water).
- Transport in media that prevent degradation, label and send to lab promptly.
- Testing and analysis:
- Visual examination; laboratory testing as appropriate.
- Suggested tests include wide‑width tensile (ISO 10319) and scanning electron microscopy (SEM) for surface/chemical attack.
- Reporting: Comprehensive report must include initial conditions, retrieval operation, lab results, method reference (ISO 13437:2019), deviations, unusual observations and organizational comments.
Applications and Who Should Use It
ISO 13437:2019 is practical for:
- Geotechnical and civil engineers assessing long‑term performance of geomembranes, geotextiles, geogrids and other geosynthetics
- Contractors and quality control teams monitoring installation damage
- Owners and asset managers needing documented evidence of product condition
- Testing laboratories performing comparative analyses of retrieved and control specimens
- Regulators and specifiers requiring standardized field sampling for durability claims
Practical benefits include standardized sample handling to minimize artefacts, defensible data for maintenance/repair decisions, and improved lifecycle evaluation of geosynthetic installations.
Related Standards
- ISO 9862 - Geosynthetics: Sampling and preparation of test specimens
- ISO 10318-1 - Geosynthetics: Terms and definitions
- ISO 10319 - Wide‑width tensile test (commonly referenced for tensile testing)
Keywords: ISO 13437:2019, geosynthetics, durability assessment, field sampling, retrieval samples, control specimens, installation damage, wide‑width tensile, SEM.