ASTM_D_7004_-_D_7004M_-_03_2013e1.pdf

Designation:D7004/D7004M03(Reapproved 2013)1Standard Test Method forGrab Tensile Properties of Reinforced Geomembranes1This standard is issued under the fixed designation D7004/D7004M;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.1NOTEUnits information was editorially corrected in June 2013.1.Scope1.1 This test method is used to measure the grab tensileproperties of reinforced geomembranes.1.2 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.1.3 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 forTextilesD4354 Practice for Sampling of Geosynthetics and RolledErosion Control Products(RECPs)for TestingD4439 Terminology for Geosynthetics3.Terminology3.1 Definitions:3.1.1 Definitions of terms applying to this test methodappear in Terminology D4439.3.1.2 atmosphere for testing geosynthetics,nair main-tained at a relative humidity between 50 to 70%and atemperature of 21 6 2C 70 6 4F.3.1.3 reinforced geomembrane,na geomembrane inter-nally reinforced with a textile.3.1.4 yarn,na generic term for a continuous strand oftextile fibers,filaments or material in a form suitable forknitting,weaving or otherwise intertwining to form a textilefabric.4.Significance and Use4.1 This test method evaluates grab tensile properties ofreinforced geomembranes for the purposes of quality control,quality assurance and research.In order to evaluate the fullcontribution of the reinforcement,testing is performed parallelto the directions of reinforcement.This test method is an indextest and is not intended for design purposes.5.Apparatus5.1 Tensile Testing MachineConstant Rate of Extension(CRE)equipment meeting the requirements of SpecificationD76/D76M.The load cell shall be accurate to within 61%ofthe applied force.The drive mechanism shall be able to controlthe rate of extension to within 61%of the targeted rate.5.2 GripsOne of the grips must be self aligning tocompensate for uneven distribution of force across the speci-men.The clamping force and the clamp surfaces shall hold thespecimen firmly without causing damage.The clamps shall becapable of gripping a 25 mm 1 in.by 25 mm 1 in.area.Thiscan be accomplished by either using 25 mm 1 in.squareclamp faces or by using clamps with dimensions of 25 mm 1in.by greater than 25 mm 1 in.and crossing the clamps inthe grips so that only a 25 mm 1 in.by 25 mm 1 in.area isgripped.5.3 Recording MechanismThe testing machine shall beequipped with equipment capable of producing a hard copy ofthe force versus displacement curve.Electronic data acquisi-tion with printer capabilities or direct recording devices areacceptable.6.Sampling,Test Specimens,and Test Units6.1 Lot SampleFor the lot sample,take rolls of geomem-brane per the applicable project specification,or as agreedupon between purchaser and supplier.Unless otherwisespecified,refer to Practice D4354.1This test method is under the jurisdiction of ASTM Committee D35 onGeosynthetics and is the direct responsibility of Subcommittee D35.10 on Geomem-branes.Current edition approved May 1,2013.Published June 2013.Originallyapproved in 2003.Last previous edition approved in 2008 as D700403(2008).DOI:10.1520/D7004_D7004M-03R13E01.2For 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 6.2 Laboratory SampleFor the laboratory sample,take afull-width swatch approximately 1 m 3 ft long by roll widthfor each roll in the lot sample.Take a sample that will excludematerial from the outer wrap of the roll or the inner wraparound the core.In the case where the sample is taken at theproduction site,material from the outer wrap may be used if itis undamaged.6.3 Test SpecimensPrepare five specimens with the lengthof the specimen parallel to the machine direction(MD)and fivespecimens with the length parallel to the transverse direction(TD)for materials with the reinforcement running in thosedirections.If the reinforcement is aligned in any direction otherthan the machine or