ISO 10319

Geosynthetics play a critical role in civil engineering, drainage, reinforcement, erosion control, landfill systems, and road construction. Their long-term performance depends heavily on tensile behavior under load. ISO 10319 provides a standardized method for evaluating the tensile properties of geosynthetics through a wide-width tensile test.

The ISO 10319 method helps manufacturers, laboratories, and quality control teams compare products under consistent conditions. It measures tensile strength, elongation, secant stiffness, and strain at maximum force. Because the specimen width is greater than the gauge length, the test better reflects how geosynthetics behave in real applications.

What Is ISO 10319?

ISO 10319 is an international standard for determining the tensile properties of geosynthetics using a wide-width strip specimen. The method applies to many materials, including:

• Geotextiles tejidos
• Geotextiles no tejidos
• Geotextiles de punto
• Geogrids
• Geocomposites
• Geonets
• Geomats
• Clay geosynthetic barriers
• Metallic geosynthetic products
• Woven steel wire mesh products

The standard does not apply to polymeric or bituminous geosynthetic barriers. However, it does apply to clay-based geosynthetic barriers.

Wide-Width Tensile Test for Geosynthetic Tensile Testing

En wide-width tensile test remains one of the most important methods for geosynthetic tensile testing because it minimizes edge contraction and distributes force across a broader specimen area.

Unlike narrow-strip tensile methods, ISO 10319 uses specimens that are typically 200 mm wide with a gauge length of 100 mm between the jaws. This geometry provides a more realistic representation of field performance.

During the test, the operator clamps the specimen across its full width and applies a tensile load at a constant cross-head speed until rupture occurs. An extensometer measures the change in gauge length between two reference points.

The test produces a tensile force-strain curve that allows users to determine:

• Maximum tensile force
• Tensile strength per unit width
• Tensile strain at maximum force
• Secant tensile stiffness
• Elongation at pre-tension force
• Tensile strain at nominal tensile strength
• Second-peak tensile strength for products with multiple peak behavior

Geosynthetic Elongation Test and Tensile Strain Measurement

En geosynthetic elongation test under ISO 10319 focuses on strain behavior as the specimen stretches under load. Accurate elongation measurement is essential because many geosynthetic products must maintain dimensional stability while still providing flexibility.

The standard defines a nominal gauge length of 60 mm between two reference points. Before the actual test begins, the operator applies a pre-tension force equal to 1% of the expected maximum tensile force. This step establishes the true gauge length.

For nonwoven geotextiles, the standard allows testing without pre-tension because these materials often deform differently from woven structures.

ISO 10319 also specifies that the strain rate should generally remain within 20 ± 5% per minute for products with elongation above 5%. Brittle products such as glass-based geosynthetics may require a slower speed so that rupture occurs within approximately 30 seconds.

Tensile Properties of Geosynthetics Measured by ISO 10319

The standard covers several critical tensile properties of geosynthetics.

Resistencia a la tracción

Tensile strength represents the maximum force per unit width that the specimen can withstand before rupture. Laboratories report this value in kN/m.

For some products, especially certain geogrids and reinforcement materials, the tensile force-strain curve may show a second peak. In such cases, ISO 10319 requires reporting both the first and second peak values.

Tensile Strain at Maximum Force

Tensile strain at maximum force indicates how much the material stretches when it reaches its peak load. This value helps engineers understand whether a product behaves as a low-elongation reinforcement material or as a more flexible separator or filter.

Secant Tensile Stiffness

Secant stiffness provides additional information about the relationship between load and strain at a selected point on the curve. This value is especially useful for reinforcement design because it shows how the material responds before failure.

Wet and Conditioned Testing

ISO 10319 includes procedures for both dry and wet testing. Wet testing requires immersing specimens in water at 20 °C for at least 24 hours.

This requirement is important for products used in drainage, erosion control, or buried applications where moisture exposure affects performance.

Specimen Preparation Requirements in ISO 10319

Proper specimen preparation strongly influences the accuracy of ISO 10319 results.

Most specimens require a nominal width of 200 mm and enough length to maintain at least 100 mm between the jaws. However, different geosynthetic structures may require special preparation.

For example:

• Woven geotextiles often require trimming threads evenly from both sides
• Geogrids require intact ribs and nodes in the gauge area
• Steel wire mesh products require extensometer marks on double twists
• Narrow products such as geostrips or geocell strips should be tested at full product width
• Seam and joint testing should use the same specimen width as the unseamed reference specimen

Laboratories typically test at least five specimens in both machine direction (MD) and cross-machine direction (CMD).

Equipment for ISO 10319 Wide-Width Tensile Testing

A reliable tensile testing machine is essential for compliance with ISO 10319. The equipment should conform to ISO 7500-1 Class 1 or better and provide:

• Constant cross-head speed control
• Accurate force measurement
• Wide grips or capstan grips
• Minimal specimen slippage
• Extensometer compatibility
• Computerized data acquisition and curve analysis

For strong or slip-prone materials, capstan grips often improve clamping performance. Free-swiveling jaws also help distribute load evenly across the specimen width.

Cell Instruments offers tensile testing systems suitable for ISO 10319 applications. A properly configured universal tensile tester with wide grips, extensometer integration, and customizable fixtures can support testing for woven geotextiles, nonwoven geotextiles, geogrids, and geocomposites.

Preguntas frecuentes