1、Designation:D717918Standard 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 number in parentheses
2、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 construction quality assu
3、rance(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 use.It is therespon
4、sibility of the user of this standard to establish appro-priate safety,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.5 This international standard was developed in accor-dance with internationally recognized principles on standard-izatio
5、n established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D76/D76M Specification for Tensile Testing Machines forTexti
6、lesD4354 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-
7、tained at a relative humidity between 50 to 70%and atemperature of 21 6 2 C(70 6 4 F).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 cont
8、ain aknown bias but which may be used to establish an order for aset of specimens 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 app
9、lied longitudinally to thespecimen at a constant rate of crosshead movement.The test 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 assuranc
10、e.Testing is performed parallel to the machine direction only,forthat is the primary direction that geonets witness 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 requiremen
11、ts 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.6.2 GripsOne of the grips must be self-aligning to com-pensate for uneven distribution of force across the
12、specimen.The clamping force and the clamp surfaces shall hold thespecimen firmly without 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 of
13、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 1,2018.Published July 2018.Originally approvedin 2005.Last previous edition approved in 2013 as D7179 07(2
14、013).DOI:10.1520/D7179-18.2For 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 Ha
15、rbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations
16、 issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 the force-versus-displacement curve.Electronic data acquisi-tion with printer capabilities 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 D4354.7.2 Laboratory SampleFor laboratory sample,take a fu
