ASTM D6524/D6524M-16 (R2021) pdf free download.Standard Test Method for Measuring the Resiliency of Turf Reinforcement Mats(TRMs).
1.1 This test method covers the resiliency or recovery of turf reinforcement mats (TRMs) after they have been subjected to three cycles of loading at 689 kPa F 1(X) psi] for I mm/per cycle.
1.2 This test method does not provide resiliency values for TRMs under variable normal compressive stresses. This test method determines nominal resiliency.
1.3 The values stated in either SI units or inch-pound units are to he regarded separately as standard. The values stated in each system are not necessarily exact equivalents: therefore, to ensure conformance with the standard, each system shall be used independently of the other, and values from the two systems shall not be combined.
3. Terminology
3. 1 Definitions:
3.1.1 pressure, ,n—the force or load per unit area.
3.1.2 thkkness—(l) the distance between one planar surface and its opposite parallel and planar surtuice: (2) lhr TRMs, the distance between the upper and lower surfaces of the material, measured under a specified pressure and time.
3. 1 .3 turf reinforcement mat (TRM), n—a long-term nondegradable rolled erosion control product composed of UV stabilized, nondegradable, synthetic fIbers, nettings, or filaments, or combination thereof, processed into three- dimensional reinforcement matrices.
3.2 For definitions of other textile terms used in this test method, refer to Terminology D123.
3.3 For definitions of other terms relating to geotextiles and geomembranes used in this test method, refer to Terminology D4439.
4. Summary of Test Method
4.1 The nominal resiliency of TRMs is determined by observing the thickness of the TRM before and after it is subjected to three cycles of loading at 689 kPa [100 psi] for 1 min/cycle.
5. Significance and Use
5.1 Resiliency may be used to control the quality of many TRMs. Resiliency may he indicative of a TRM’s ability to retain original configuration after exposure to the stresses which may be exerted during manufacture, shipping, and installation. Resiliency is not generally indicative of field performance.
5.2 The resiliency of TRMs may vary considerably depending on the pressure applied to the specimen during loading cycles. To minimize variation, specific sample size and applied pressure are indicated in this test method to ensure all results are comparable.
5.3 To determine the effect of different pressure loadings on the final thickness of TRMs, use this test method.ASTM D6524/D6524M pdf download.