ASTM_D_6637_-_D_6637M_-_15.pdf

Designation:D6637/D6637M15Standard Test Method forDetermining Tensile Properties of Geogrids by the Single orMulti-Rib Tensile Method1This standard is issued under the fixed designation D6637/D6637M;the number immediately following the designation indicates theyear of original adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of lastreapproval.A superscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method covers the determination of the tensilestrength properties of geogrids by subjecting strips of varyingwidth to tensile loading.1.2 Three alternative procedures are provided to determinethe tensile strength,as follows:1.2.1 Method ATesting a single geogrid rib in tension(Nor lbf).1.2.2 Method BTesting multiple geogrid ribs in tension(kN/m or lbf/ft).1.2.3 Method CTesting multiple layers of multiplegeogrid ribs in tension(kN/m or lbf/ft).1.3 This test method is intended for quality control andconformance testing of geogrids.1.4 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard.The values stated ineach system may not be exact equivalents;therefore,eachsystem shall be used independently of the other.Combiningvalues from the two systems may result in non-conformancewith the standard.1.5 This standard may involve hazardous materials,operations,and equipment.This standard does not purport toaddress all of the safety concerns,if any,associated with itsuse.It is the responsibility of the user of this standard toestablish appropriate safety and health practices and deter-mine the applicability of regulatory limitations prior to use.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 GeosyntheticsD5262 Test Method for Evaluating the Unconfined TensionCreep and Creep Rupture Behavior of Geosynthetics3.Terminology3.1 Definitions:3.1.1 atmosphere for testing geosynthetics,nair main-tained at a relative humidity of 50 to 70%and a temperatureof 21 6 2C 70 6 4F.3.1.2 breaking force,(F),nthe force at failure.3.1.3 corresponding force,nsynonym for force at speci-fied elongation.3.1.4 force at specified elongation,FASE,na force asso-ciated with a specific elongation on the force-elongation curve(synonym for corresponding force.)3.1.5 force-elongation curve,nin a tensile test,a graphicalrepresentation of the relationship between the magnitude of anexternally applied force and the change in length of thespecimen in the direction of the applied force(synonym forstress-strain curve.)3.1.6 geogrid,na geosynthetic formed by a regular net-work of integrally connected elements with apertures greaterthan 6.35 mm 14in.to allow interlocking with surroundingsoil,rock,earth,and other surrounding materials to primarilyfunction as reinforcement.D52623.1.7 geosynthetic,na product manufactured from poly-meric material used with soil,rock,earth,or other geotechnicalengineering related material as an integral part of a man madeproject,structure,or system.3.1.8 index test,na test procedure which may containknown bias,but which may be used to establish an order for aset of specimens with respect to the property of interest.3.1.9 integral,adjin geosynthetics,forming a necessarypart of the whole;a constituent.3.1.10 junction,nthe point where geogrid ribs are inter-connected to provide structure and dimensional stability.1This test method is under the jurisdiction of ASTM Committee D35 onGeosynthetics and is the direct responsibility of Subcommittee D35.01 on Mechani-cal Properties.Current edition approved July 15,2015.Published September 2015.Originallyapproved in 2001.Last previous edition approved in 2011 as D663711.DOI:10.1520/D6637_D6637M-15.2For 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 3.1.11 rib,nfor geogrids,the continuous elements of ageogrid which are interconnected to a node or junction.3.1.12 rupture,nfor geogrids,the breaking or tearingapart of ribs.3.1.13 tensile,adjcapable of tensions,or relating to ten-sion of a material.3.1.14 tensile strength,(f),nfor geogrids the maximumresistance to deformation developed for a specific materialwhen subjected to tension by an external force.Tensile strengthof geogrids is the characteristic of a sample as distinct from aspecimen and is expressed in force per unit width.3.1.15 tensile test,nfor geosynthetics,a test in which amaterial is stretched uniaxially to determine the force-elongation characteristics,the breaking force,or the breakingelonga