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:

• Riidest geotekstiil
• Mittekootud geotekstiil
• Kootud geotekstiil
• Geovõrgud
• Geokomposiidid
• Geonets
• Geomatid
• Savist geosünteetilised tõkked
• 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

The 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

The 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.

Tõmbetugevus

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.

Näiteks:

• Riidest geotekstiil nõuab sageli niitide ühtlast kärpimist mõlemalt poolt.
• Geovõrgud nõuavad puutumatuid ribisid ja sõlmede olemasolu mõõtmispiirkonnas.
• Terasvõrgutoodete puhul on vaja ekstensiomeetrilisi märke kahekordsetel keerdumistel.
• Kitsaid tooteid, näiteks geostriipide või geotsellilindrite puhul tuleb katsetada kogu toote laiuses.
• Õmbluste ja vuukide katsetamisel tuleks kasutada sama laiust kui õmblusteta võrdlusproovil.

Tavaliselt katsetavad laboratooriumid vähemalt viit proovi nii masina suunas (MD) kui ka masinaülesuunas (CMD).

ISO 10319 laiatarbe tõmbekatsete seadmed

Usaldusväärne tõmbekatsetamismasin on ISO 10319 nõuete täitmiseks hädavajalik. Seade peaks vastama ISO 7500-1 klassile 1 või paremale ja tagama:

• Konstantne ristpeade kiiruse reguleerimine
• Täpne jõu mõõtmine
• Laiad käepidemed või kapstan-käepidemed
• Minimaalne proovi libisemine
• Ekstensiomeetri ühilduvus
• Arvutipõhine andmete kogumine ja kõverate analüüs

Tugevate või libisemisohtlike materjalide puhul parandavad kapstanhaarded sageli kinnitusjõudlust. Vabalt pöörlevad lõuad aitavad ka koormust ühtlaselt jaotada kogu proovi laiuses.

Cell Instruments pakub tõmbekatsetussüsteeme, mis sobivad ISO 10319 rakendused. Nõuetekohaselt konfigureeritud universaalne tõmbekatseseade, millel on laiad haaratsid, ekstensomeetrite integreerimine ja kohandatavad kinnitused, võib toetada kootud geotekstiilide, mittekootud geotekstiilide, geovõrkude ja geokomposiitide katsetamist.

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