ASTM_D_6818_-_21.pdf

Designation:D681821Standard Test Method forTensile Properties of Rolled Erosion Control Products1This standard is issued under the fixed designation D6818;the number immediately following the designation indicates the year oforiginal adoption or,in the case 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 This test method covers strip test procedures for deter-mining the tensile properties of rolled erosion control products(RECPs).1.2 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are provided forinformation purposes only.1.3 This standard does not apply to RECPs made of com-posite materials where the component providing the reinforce-ment cannot be tested for tensile strength with the procedureherein described.In this case,the established ASTM testingmethod which is most appropriate for that material shall beused instead.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,health,and environmental practices and deter-mine the applicability of regulatory 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 theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D76/D76M Specification for Tensile Testing Machines forTextilesD123 Terminology Relating to TextilesD4354 Practice for Sampling of Geosynthetics and RolledErosion Control Products(RECPs)for TestingD4439 Terminology for GeosyntheticsE177 Practice for Use of the Terms Precision and Bias inASTM Test MethodsE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test Method3.Terminology3.1 Definitions:3.1.1 constant rate of extension(CRE)tensile testingmachinea testing machine in which the rate of increase ofspecimen length is uniform with time.3.1.2 elongation,nthe ratio of the extension of a materialto the length of the material prior to stretching.(Compareextension.)3.1.3 extension,nthe change in length of a material due tostretching.(Compare elongation.)3.1.4 rupture,vthe act of bursting.3.1.5 strip test,nin RECP testing,a tensile test in whichthe full width of the specimen is gripped in the clamps.3.2 For definitions of other terms used in this test method,refer to Terminology D123 or Terminology D4439.4.Summary of Test Method4.1 A test specimen is clamped in a tensile testing machineand a force applied to the specimen until it breaks.Values forthe breaking force and elongation of the test specimen areobtained from machine scales,dials,autographic recordingcharts,or a computer interfaced with the testing machine.Also,points along the stress-strain curve can be reported.5.Significance and Use5.1 The strip test in this test method is considered satisfac-tory for acceptance testing(that is,conformance to a specifi-cation)of commercial shipments of rolled erosion controlproducts,since the method has been used extensively in thetrade for acceptance testing.5.1.1 In case of disagreement arising from differences inreported test values when using this test method for acceptancetesting of commercial shipments,the purchaser and the sup-plier should conduct comparative tests to determine if there isstatistical bias between their laboratories.Competent statisticalassistance is recommended for the investigation of bias.At aminimum,the two parties should take a group of test speci-mens which are as homogeneous as possible and are from a lot1This test method is under the jurisdiction of ASTM Committee D35 onGeosynthetics and is the direct responsibility of Subcommittee D35.05 on Geosyn-thetic Erosion Control.Current edition approved Feb.15,2021.Published February 2021.Originallyapproved in 2002.Last previous edition approved in 2018 as D6818 18a.DOI:10.1520/D6818-21.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact 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 StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1of material of the type in question.The test specimens shouldthen be randomly assigned in equal numbers to each laboratoryfo