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A
Technical Guidance Manual:
Terminology and
Index Testing Procedures for Rolled Erosion Control Products
9. THICKNESS
9.1 Erosion Control Blankets
9.1.1 Determine the thickness according to ASTM D6525 with the following exceptions.
9.1.1.1 Conditioning - In addition to required moisture and temperature equilibration, allow test specimens to reach equilibrium stress condition by allowing 24 hours "stress free" storage in the standard atmosphere for testing. Stress free condition shall be facilitated when sample material is not folded or rolled, and free of thermal or mechanical stress.
Note 5: Rolled erosion control products or folded samples of products may retain residual compression after being unrolled. This residual compression has been found, in some cases, to bias thickness test results. A period of 24 hours has been found satisfactory for relaxation of compressed rolled materials.
9.1.1.2 Apparatus - The applied normal force shall be 2 kPa (2.9 psi).
9.2 Turf Reinforcement Mats
9.2.1 Determine the thickness according to ASTM D6525 with the following exception.
9.2.1.1 Conditioning - In addition to required moisture and temperature equilibration, allow test specimens to reach equilibrium stress condition by allowing 24 hours "stress free" storage in the standard atmosphere for testing. Stress free condition shall be facilitated when sample material is not folded or rolled, and free of thermal or mechanical stress.
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