1、Designation:D645499(Reapproved 2011)Standard Test Method forDetermining the Short-Term Compression Behavior of TurfReinforcement Mats(TRMs)1This standard is issued under the fixed designation D6454;the number immediately following the designation indicates the year oforiginal adoption or,in the case
2、 of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 The test method establishes the procedures for evalua-tion of the deformations of a turf reinforce
3、ment mat(TRM)under short-term compressive loading.This test method isstrictly 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 consideredas an indication of actual or long-term performanc
4、e of theTRM in field applications.1.2 Since these TRMs experience multidirectional compres-sive loadings in the field,this test method will not show actualfield performance and should not be used for this specificobjective.The evaluation of the results also should recognizethat the determination of
5、the short term single plane compres-sive behavior of geosynthetics does not reflect the installedperformance of TRMs and,therefore,should not be used as theonly method of product or performance specification.1.3 The values in SI units are to be regarded as the standard.The values stated in inch-poun
6、d units are provided in paren-theses for information only.1.4 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility
7、 of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D4354 Practice for Sampling of Geosynthetics and RolledErosion Control Products(RECPs)for TestingD4439 Terminology for GeosyntheticsD5199 Test Method for Measuring the Nominal Thicknessof Geosynthetics3.Terminology3.1
8、Definitions:3.1.1 compressive deformation,L,nthe decrease in gagelength produced in the test specimen by a compressive load.3.1.2 compressive strain,nd,nthe ratio of compressivedeformation to the gage length of the test specimen.3.1.3 gage length,L,nin compression testing,the mea-sured thickness of
9、the test specimen under specified compres-sional force,expressed in units of length prior to compressiveloading.D51993.1.4 geosynthetic,na planar product manufactured frompolymeric material used with foundation,soil,rock,earth,orany other geotechnical engineering related material as anintegral part
10、of a man-made project,structure,or system.D44393.1.5 index test,na test procedure which may contain aknown bias but which may be used to establish an order for aset of specimens with respect to the property of interest.D44393.1.6 yield point,nthe first point on the load-deformationcurve at which an
11、increase in deformation occurs without acorresponding increase in load.3.1.6.1 DiscussionSome geosynthetics do not exhibit anexact yield point.The tested TRM may exhibit a less steepslope at yield.In addition,it should be stated that the yieldpoint also may be the ultimate strength of the TRM.3.1.7
12、For definitions of terms relating to geotextiles,refer toTerminology D4439.4.Summary of Test Method4.1 Specimens are mounted between parallel plates in a loadframe.Compressive loads are applied at a constant rate ofcrosshead movement.The deformations are recorded as afunction of load.The compressive
13、 stress and strain are evalu-ated and plotted.The compressive yield point is evaluated fromthe stress/strain relationship for those materials that exhibit adetectable compressive yield point.1This test method is under the jurisdiction of ASTM CommitteeD35 onGeosynthetics and is the direct responsibi
14、lity of Subcommittee D35.05 on Geosyn-thetic Erosion Control.Current edition approved June 1,2011.Published July 2011.Originally approvedin 1999.Last previous edition approved in 2006 as D645499(2006).DOI:10.1520/D6454-99R11.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontac
15、t ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 5.Significance and Use5.1 The c
16、ompression behavior test for TRMs is intended tobe an index test.It is anticipated that the results of thecompression behavior test will be used to evaluate product.The results of the analyses also may be used to compare therelative compressive yield points of materials that exhibit adetectable compressive yield point.It is anticipated that thistest will be used for quality control testing to evaluateuniformity and consistency within a lot or between lots wheresample geometry factors,for example