ASTM D6524-16(R2021) pdf free download

ASTM D6524-16(R2021) pdf free download.Standard Test Method for Measuring the Resiliency of Turf Reinforcement Mats (TRMs)
1. Scope
1.1 This test method covers the resiliency or recovery ofturf reinforcement mats (TRMs) after they have been subjected to three cycles ofloading at 689 kPa [100 psi] for 1 min/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 be 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. 1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appro- priate safety, health, and environmental practices and deter- mine the applicability ofregulatory limitations prior to use. 1.5 This international standard was developed in accor- dance with internationally recognized principles on standard- ization established in the Decision on Principles for the Development of International Standards, Guides and Recom- mendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
3. Terminology
3.1 Definitions: 3.1.1 pressure, n—the force or load per unit area. 3.1.2 thickness—(1) the distance between one planar surface and its opposite parallel and planar surface; (2) for TRMs, the distance between the upper and lower surfaces of the material, measured under a specified pressure and time. 3.1.3 turfreinforcement mat (TRM), n—a long-term nonde- gradable 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 be 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 ofTRMs may vary considerably depend- ing 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. 5.4 This test method may be used for acceptance testing of commercial shipments of TRMs, but caution is advised since information on between-laboratory precision is incomplete. Comparative tests in accordance with 5.4.1 may be advisable. 5.4.1 In a case of a dispute arising from differences in reported test results when using this test method for acceptance testing of commercial shipments, the purchaser and the sup- plier should conduct comparative tests to determine if there is a statistical bias between their laboratories. Competent statis- tical assistance is recommended for the investigation of bias. As a minimum, the two parties should take a group of test specimens that are as homogeneous as possible and that are formed from a lot of material of the type in question. The test specimens should be randomly assigned in equal numbers to each laboratory for testing. The average results from the two laboratories should be compared using Student’s t-test for unpaired data and an acceptable probability level chosen by the two begun. If bias is found, either its cause must corrected, or the purchaser and be found and interpret future tests in supplier must agree to the light of the known bias. N OTE 1—The user should be aware that the compressibility of the materials, their rebound characteristics, and the like will also be affected by the thickness of the TRMs following the time when they are rolled up on rolls shipped and stored.