ASTM_D_6818_-_14.pdf

Designation:D681814Standard Test Method forUltimate Tensile Properties of Rolled Erosion ControlProducts1This 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 Prod-ucts(RECP).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 ofcomposite materials where the component providing the rein-forcement cannot be tested for tensile strength with theprocedure herein described.In this case,the establishedASTMtesting method,which is most appropriate for that material,shall be used 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 and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D76/D76M Specification for Tensile Testing Machines forTextilesE177 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 breaking load,nthe maximum force applied to aspecimen in a tensile test carried to rupture.3.1.1.1 DiscussionMaterials that are brittle usually rup-ture at the maximum force.Materials that are ductile usuallyexperience a maximum force before rupturing.3.1.2 constant rate of extension(CRE)tensile testingmachinea testing machine in which the rate of increase ofspecimen length is uniform with time.3.1.3 elongation,nthe ratio of the extension of a materialto the length of the material prior to stretching.(Compareextension.)3.1.4 extension,nthe change in length of a material due tostretching.(Compare elongation.)3.1.5 rupture,vthe act of bursting.3.1.6 strip test,nin RECP testing,a tensile test in whichthe full width of the specimen is gripped in the clamps.3.1.7 tensile test,nin geosynthetics,a test in which ageosynthetic material is stretched in one direction to determinethe force-elongation characteristics,the breaking force,or thebreaking elongation.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 of commercial shipments of RolledErosion Control Products since the method has been usedextensively in the trade 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.As aminimum,the two parties should take a group of test specimenwhich are as homogeneous as possible and are from a lot ofmaterial of the type in question.The test specimen should then1This 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 May 1,2014.Published May 2014.Originallyapproved in 2002.Last previous edition approved in 2009 as D6818 02(2009).DOI:10.1520/D6818-14.2For 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 States1 be randomly assigned in equal numbers to each laboratory fortesting.The average results from the two laboratories should becompared using Students t-test for unpaired data and anacceptable probability level chosen by the two parties beforetesting is begun.If bias is found,either its cause must be foundand corrected,or the purchaser and the supplier must agree tointerpret future results in the light of the known bias.6.Apparatus6.1 Tensile Testing Machine,of the Constant Rate of Exten-sion(CRE)type conforming to Specification D76/D76M,withrespect to force i