Multi-axial tensile testing

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Presentation transcript:

Multi-axial tensile testing a new standard in geogrid testing. Utilizing astm d5617 to compare geogrid performance Reflective of real-world stresses

CURRENT geogrid SPECIFICATIONS FOR RIB STRENGTH/PROPERTIES: ASTM D6637 UltIMATE TENSILE STRENGTH TENSILE STRENGTH AT 2% STRAIN TENSILE STRENGTH AT 5% STRAIN FOR GRID JUNCTION STRENGTH/PROPERTIES: Gri-gg2 –junction strength Army corp of engineers - Aperture stability All single plane tests that show: index values for quality assurance Comparative values to publish No relationship to in-use performance of geogrids

Astm d5617: multi-axial tensile test for geosynthetics Scope: “…covers the measurement of the out-of-plane response of geosynthetics to a force applied perpendicular to the initial plane of the sample.” Primarily used in testing of geomembranes

Astm d5617: multi-axial tensile test for geosynthetics Optimum for geogrid testing because: Stresses entire grid assembly Applies short-term, high-intensity load

Rectangular vs. triangular aperture? Why consider Astm d5617? Best imitates the wheel loading through a compacted base course in a laboratory environment ‘apples to apples’ Performance comparison on geogrid styles Rectangular vs. triangular aperture? No rib tensile strength values (Δ) Aperture stability value: lower torque (Δ)

Astm d5617 results and feedback IDEAL FOR PERFORMANCE COMPARISON 4 repeatable, definable test results: Deflection at rupture Pressure at rupture Axi-symmetric break resistance strain Failure specifics IDEAL FOR PERFORMANCE COMPARISON

Tbx biaxial geogrid vs. triangular aperture grid RESULTS