The European standard “EN 12226 Geosynthetics - General tests for evaluation following durability testing” describes test methods for determining changes in specific properties of aged geosynthetics.
In principle, test specimens are subjected to durability testing for geosynthetics. Following exposure, visual and, if necessary, microscopic examination is performed, and changes in tensile or compressive properties are determined as appropriate. The ISO/TS 13434 standard applies to the relevant durability tests.
For each durability test, at least five test and control specimens must be provided, both in the machine direction and in the transverse direction, unless the structure of the geosynthetic material makes this unsuitable. The specimens are prepared in accordance with the EN ISO 9862 standard. A general overview of the test methods, specimen dimensions, and test conditions according to the product type is given in the table within the standard.
For woven and knitted geotextiles, pairs of test and control samples, at least 60 mm wide and 300 mm long, containing the same yarns or strips in the test direction, i.e., adjacent along the shorter dimension, are cut. These yarns or strips are counted and recorded within 50 mm in the machine direction and the cross-machine direction.
For woven geotextiles, approximately equal numbers of threads are removed from each of the long edges of the cut strip, so that the width of the exposed and control samples contains an equal number of threads. For machine and cross-machine orientations, the tensile strengths of the control samples and the tensile strengths of the exposed samples are recorded separately.
For nonwoven geotextiles, pairs of test and control samples are cut side-by-side along the larger dimension, to a minimum width of 50 mm and a length of 300 mm.
The procedure is as follows:
In short, this standard includes test methods to evaluate how the properties of geosynthetics change after being subjected to durability or accelerated aging processes. Geosynthetics are synthetic products (e.g., geotextiles, geogrids, geomembranes, geocomposites) used in civil engineering and geotechnical applications for functions such as filtration, separation, reinforcement, drainage, protection, and erosion control in roads, railways, landfills, coastal works, dams, and other infrastructure projects.
The primary goal is to quantify the properties preserved after artificial aging (e.g., the percentage of original strength or function retained) and enable engineers, manufacturers, and specifiers to evaluate long-term performance and durability under simulated environmental stresses.
This standard does not describe the aging/conditioning procedures themselves (these are defined in other standards such as EN 12224 for weathering exposure or EN 12225 for microbiological degradation). Instead, the EN 12226 standard focuses on assessment tests performed after such durability exposures.
This standard defines general procedures for comparing changes in specific properties of aged (exposed) geosynthetics with those of unaged control samples. Key considerations include:
Common characteristics evaluated after durability testing include:
The EN 12226 standard is widely referenced in product specifications and harmonized standards under the Construction Products Regulation (CPR). For example,
These product standards typically require durability testing followed by evaluation according to the EN 12226 standard to declare the properties retained after aging.
Geosynthetics are widely used in civil engineering for functions such as filtration, separation, reinforcement, drainage, erosion control, and waterproofing in applications like the following:
This standard plays a critical role in ensuring the long-term reliability of geosynthetic materials in demanding civil engineering applications where a service life of 50-100 years is typically expected.
Without a consistent, reproducible method for evaluating post-aging performance, different manufacturers, testing laboratories, designers, and certification bodies may use entirely different approaches, which can lead to:
For many years, our organization, with its competent and experienced staff, has been understanding the needs of its clients, providing the advanced testing services they require, and assisting them in the establishment, implementation, and improvement of management systems. Within this framework, we also provide testing services in accordance with the EN 12226 standard.
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