ASTM_D_7556_-_10.pdf

Designation:D755610Standard Test Methods forDetermining Small-Strain Tensile Properties of Geogrids andGeotextiles by In-Air Cyclic Tension Tests1This standard is issued under the fixed designation D7556;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 These test methods cover the determination of small-strain tensile properties of geogrids and geotextiles by subject-ing wide-width specimens to cyclic tensile loading.1.2 These test methods(A,B,and C)allow for the deter-mination of small-strain cyclic tensile modulus by the mea-surement of cyclic tensile load and elongation.1.3 This test method is intended to provide properties fordesign.The test method was developed for mechanistic-empirical pavement design methods requiring input of thereinforcement tensile modulus.The use of cyclic modulus fromthis test method for other applications involving cyclic loadingshould be evaluated on a case-by-case basis.1.4 Three test methods(A,B,and C)are provided todetermine small-strain cyclic tensile modulus on geogrids andgeotextiles.1.4.1 Test Method ATesting a relatively wide specimen ofgeogrid in cyclic tension in kN/m(lbf/ft).1.4.2 Test Method BTesting multiple layers of a relativelywide specimen of geogrid in cyclic tension in kN/m(lbf/ft).1.4.3 Test Method CTesting a relatively wide specimen ofgeotextile in cyclic tension in kN/m(lbf/ft).1.5 The values stated in SI units are to be regarded asstandard.The values given in parentheses are provided forinformation only and are not considered standard.1.6 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 Specification for Tensile Testing Machines for TextilesD123 Terminology Relating to TextilesD579 Specification for Greige Woven Glass FabricsD4354 Practice for Sampling of Geosynthetics and RolledErosion Control Products(RECPs)for TestingD4439 Terminology for 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 corresponding force,nsynonym for force at speci-fied elongation.3.1.3 force at specified elongation(FASE),nforce associ-ated with a specific elongation on the force-elongation curve.(Synonym for corresponding force.)3.1.4 force-elongation curve,nin a tensile test,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.)3.1.5 geogrid,ngeosynthetic formed by a regular networkof integrally connected elements with apertures greater than6.35 mm(14in.)to allow interlocking with surrounding soil,rock,earth,and other surrounding materials to primarilyfunction as reinforcement.3.1.6 geosynthetic,nproduct manufactured from poly-meric material used with soil,rock,earth,or other geotechnical1These test methods are under the jurisdiction of ASTM Committee D35 onGeosynthetics and are the direct responsibility of Subcommittee D35.01 onMechanical Properties.Current edition approved Feb.1,2010.Published April 2010.DOI:10.520/D755610.2For 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 engineering related material as an integral part of a man madeproject,structure,or system.3.1.7 geotextile,nany permeable textile material usedwith foundation,soil,rock,earth,or any other geotechnicalengineering related material,as an integral part of a man-madeproject,structure,or system.3.1.8 integral,adjin geosynthetics,forming a necessarypart of the whole;a constituent.3.1.9 junction,npoint where geogrid ribs are intercon-nected to provide structure and dimensional stability.3.1.10 rib,nfor geogrids,continuous elements of ageogrid which are either in the machine or cross-machinedirection as manufactured.3.1.11 tensile,adjcapable of tensions,or relating to ten-sion of a material.3.1.12 tensile strength,(f),nfor geogrids,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.3.1.13 tensile test,nfor geosynthetics,test in which amaterial i