ASTM D6454-99(R2021) pdf free download
ASTM D6454-99(R2021) pdf free download.Standard Test Method for Determining the Short-Term Compression Behavior of Turf Reinforcement Mats (TRMs)
1. Scope
1.1 This test method establishes the procedures for evalua- tion of the deformations of a turf reinforcement mat (TRM) under short-term compressive loading. This test method is strictly an index test method to be used to verify the compres- sive strength consistency of a given manufactured geosyn- thetic. Results from this test method should not be considered as an indication of actual or long-term performance of the TRM in field applications. 1.2 Since these TRMs experience multidirectional compres- sive loadings in the field, this test method will not show actual field performance and should not be used for this specific objective. The evaluation of the results also should recognize that the determination of the short-term single plane compres- sive behavior of geosynthetics does not reflect the installed performance ofTRMs and, therefore, should not be used as the only method of product or performance specification. 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 compressive deformation, [L], n—the decrease in gage length produced in the test specimen by a compressive load. 3.1.2 compressive strain, [nd], n—the ratio of compressive deformation to the gage length of the test specimen. 3.1.3 gage length, [L], n—in compression testing, the mea- sured thickness of the test specimen under specified compres- sional force, expressed in units of length prior to compressive loading. D5199 3.1.4 geosynthetic, n—a planar product manufactured from polymeric material used with foundation, soil, rock, earth, or any other geotechnical engineering related material as an integral part of a man-made project, structure, or system. D4439 3.1.5 index test, n—a test procedure which may contain a known bias but which may be used to establish an order for a set ofspecimens with respect to the property ofinterest. D4439 3.1.6 yield point, n—the first point on the load-deformation curve at which an increase in deformation occurs without a corresponding increase in load. 3.1.6.1 Discussion—Some geosynthetics do not exhibit an exact yield point. The tested TRM may exhibit a less steep slope at yield. In addition, it should be stated that the yield point also may be the ultimate strength of the TRM. 3.1.7 For definitions of terms relating to geotextiles, refer to Terminology D4439.
5. Significance and Use
5.1 The compression behavior test for TRMs is intended to be an index test. It is anticipated that the results of the compression behavior test will be used to evaluate product. The results of the analyses also may be used to compare the relative compressive yield points of materials that exhibit a detectable compressive yield point. It is anticipated that this test will be used for quality control testing to evaluate uniformity and consistency within a lot or between lots where sample geometry factors, for example, thickness, or materials may have changed. N OTE 1—This is a one-dimensional test for compressive loading of a TRM in one plane. 5.1.1 The compressive yield point of TRMs may be evalu- ated from the stress/strain relationship. Many materials exhibit compressive deformation but may not show a distinct com- pressive yield point. 5.2 This test method can be used to evaluate the short-term stress/strain behavior of TRMs under compressive stress while loaded at a constant rate of deformation. 5.3 This test method may be used for acceptance testing of commercial shipments ofTRMs but caution is advised because interlaboratory testing is incomplete. 5.3.1 In the 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 statistical bias between their laboratories. Competent statistical assistance is recommended for the investigations of bias. As a minimum, two parties should take a group of test specimens from material shipped to project. The test specimens then should be assigned randomly in equal numbers to each laboratory for testing. The average results from the two laboratories should be compared using the Student’s t-test for unpaired data and an acceptable probability level chosen by the two parties before the testing is begun. If bias is found, either its cause must be found and corrected, or the purchaser
