ASTM F3415-20,Standard Test Method for Triaxial Shear Strength and Cohesion of Equine Sports Surfaces.
ASTM F3415-20 covers the determination of strength and stress-strain relationships of a cylindrical specimen of a compacted, drained cohesive natural or synthetic soil surface used in equine sports surfaces.
Referenced Documents
D4767 Test Method for Consolidated Undrained Triaxial Compression Test for Cohesive Soils.
To test the shear strength of a materials describing how the material resists sliding of surface layers. Data from these tests are used to calculate the friction angle and cohesion of a surface sample. This test can be used to help determine if a material falls within a suitable for equine sports surfaces.
Summary of Test Method
The test is done by creating a cylindrical-shaped, 70 mm-diameter, 150 mm-tall compacted sample using a rubber membrane and an aluminum shell mold. Once the compacted sample(with membrane) is removed from the mold, the sample is placed in a cylindrical Plexiglas cell which is then filled with water, placed in a tensile test machine, and subjected to avertical compressive load until failure is reached (Fig. 1).
Tests are conducted at various confining pressures, moisture contents, and temperatures depending on whether the sample is dirt or synthetic. The samples are compacted in six 25 mm (1in ) lifts to reach the sample height of 150 mm (6 in. ) .Tests are performed at confining pressures of 5, 10, 15 and 20 psi and are conducted for both dirt and synthetic surface samples.
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