1、Designation:D717907(Reapproved 2013)Standard Test Method forDetermining Geonet Breaking Force1This standard is issued under the fixed designation D7179;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A numbe
2、r 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 is used to measure the breaking forceof a Geonet.1.2 This test is applicable for manufacturing quality control(MQC)and construc
3、tion quality assurance(CQA)testing andis not recommended as a performance test.1.3 The values stated in SI units are to be regarded asstandard.The values given in parentheses are for informationonly.1.4 This standard does not purport to address all of thesafety concerns,if any,associated with its us
4、e.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:2D4354 Practice for Sampling of Geosynthetics and RolledErosion Control Produc
5、ts(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
6、4F).3.1.3 geonet,na geosynthetic consisting of integrallyconnected parallel sets of ribs overlying similar sets at variousangles for planar drainage of liquids or gases.3.1.4 index test,na test procedure which may contain aknown bias but which may be used to establish an order for aset of specimens
7、with respect to the property of interest.3.1.5 peak load,nmaximum force recorded during atensile test.4.Summary of Test Method4.1 Geonet specimens are mounted between full width gripsin a load frame.Tensile load is applied longitudinally to thespecimen at a constant rate of crosshead movement.The te
8、st iscarried to rupture and a maximum breaking force of eachspecimen is recorded.5.Significance and Use5.1 This method evaluates tensile breaking force of geonetsfor the purposes of quality control and quality assurance.Testing is performed parallel to the machine direction only forthat is the prima
9、ry direction that geonets witnesses tensileloading.This method is an index test and is not intended fordesign purposes.6.Apparatus6.1 Tensile Testing MachineConstant Rate of Extension(CRE)equipment meeting the requirements of SpecificationD76.The load cell shall be accurate to within 61%of theapplie
10、d force.The drive mechanism shall be able to control therate of extension to within 61%of the targeted rate.6.2 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 witho
11、ut causing damage.The clamps shall becapable of gripping a 100 mm(4 in.)by 25 mm(1 in.)area ata minimum.6.3 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 capabili
12、ties or direct recording devices isacceptable.7.Sampling,Test Specimens,and Test Units7.1 Lot SampleFor the lot sample,take rolls of geonet perthe applicable project specification,or as agreed upon betweenpurchaser and supplier.Unless otherwise specified,refer toPractice D4354.1This test method is u
13、nder the jurisdiction of ASTM Committee D35 onGeosynthetics and is the direct responsibility of Subcommittee D35.01 on Mechani-cal Properties.Current edition approved Jan.1,2013.Published January 2013.Originallyapproved in 2005.Last previous edition approved in 2007 as D717907.DOI:10.1520/D7179-07R1
14、3.2For 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,W
15、est Conshohocken,PA 19428-2959.United States1 7.2 Laboratory SampleFor laboratory sample,take a full-width swatch approximately 1 m(3 ft)long by roll width foreach 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 c
16、ase where the sample is taken at theproduction site,material from the outer wrap may be used if itis undamaged.7.3 Test Specimens Prepare five specimens with the lengthof the specimen parallel to the machine direction(MD).Cut thespecimens such that none are obtained within 150 mm(6 in.)of the roll edges.7.4 Specimen Size and ShapeThe specimens shall be 1026 2 mm(4 6 0.08 in.)wide by 203 6 4 mm(8 6 0.16 in.)long(test direction).Die cut test specimens are recommended.7.5 Test UnitTest five specime
