1、Designation: D 7003 03Standard Test Method forStrip Tensile Properties of Reinforced Geomembranes1This standard is issued under the fixed designation D 7003; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision
2、. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This test method is used to measure the strip tensileproperties of reinforced geomembranes.1.2 The values stated in SI units are t
3、o be regarded asstandard. The values given in parentheses are for informationonly.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 d
4、etermine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2D 76 Specification for Tensile Testing Machines for TextilesD 4354 Practice for Sampling of GeosyntheticsD 4439 Terminology for Geosynthetics3. Terminology3.1 DefinitionsDefinitions of terms
5、 applying to this testmethod appear in Terminology D 4439.3.1.1 atmosphere for testing geosynthetics, nair main-tained at a relative humidity between 50 to 70 % and atemperature of 21 6 2C (70 6 4F).3.1.2 reinforced geomembrane, na geomembrane inter-nally reinforced with a textile.3.1.3 yarn, na gen
6、eric 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 method evaluates strip tensile properties of rein-forced geomembranes for the purposes of quality contro
7、l,quality assurance and research. In order to evaluate the fullcontribution of the reinforcement, testing is performed parallelto the directions of reinforcement. This method is an index testand is not intended for design purposes.5. Apparatus5.1 Tensile Testing MachineConstant Rate of Extension(CRE
8、) equipment meeting the requirements of SpecificationD 76. The load cell shall be accurate to within 61 % of theapplied force. The drive mechanism shall be able to control therate of extension to within 61 % of the targeted rate.5.2 GripsOne of the grips must be self aligning tocompensate for uneven
9、 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 usi
10、ng 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 disp
11、lacement curve. Electronic data acquisi-tion with printer capabilities or direct recording devices areacceptable.6. Sampling and Test Specs and Units6.1 Lot SampleFor the lot sample, take rolls of geomem-brane per the applicable project specification, or as agreedupon between purchaser and supplier.
12、 Unless otherwise speci-fied, refer to Practice D 4354.6.2 Laboratory SampleFor the laboratory sample, take afull-width swatch approximately1m(3ft)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 co
13、re. 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 dire
14、ction(TD) for materials with the reinforcement running in thosedirections. If the reinforcement is aligned in any direction otherthan the machine or transverse directions, specimens shall becut parallel to those directions and so noted in the report. Cut1This test method is under the jurisdiction of
15、 ASTM Committee D35 onGeosynthetics and is the direct responsibility of Subcommittee D35.10 on Geomem-branes.Current edition approved Dec. 1, 2003. Published January 2004.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at seviceastm.org. For Annu
16、al Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.the specimens such that different reinforcing yarns or strandsare tested in
17、each specimen. Specimens may be taken from theselvage as long as there are not more yarns in the selvage thanin the rest of the product.6.4 The specimens shall be 25 mm (1 in.) wide by at least150 mm (6 in.) long (test direction). Test specimens shall be cutparallel to the direction of reinforcement
18、 being tested. Rein-forcement in the test direction should be continuous so thesame strands of reinforcement can be gripped in both clamps.This is a critical point since the tensile strength is significantlyreduced if the reinforcing yarns are not all continuous from oneclamp to the other. Each spec
19、imen is to be inspected for cut testdirection yarns. If it is not possible to prepare the specimenswithout cutting test direction yarns, it shall be so noted in thereport.7. Conditioning7.1 ConditioningSpecimens may be tested once they haveequilibrated at standard laboratory temperature. The timereq
20、uired to reach temperature equilibrium may vary accordingto the manufacturing process, material type and materialthickness.7.2 Test ConditionsConduct tests at the standard atmo-sphere for testing geosynthetics, a temperature of 21 6 2C (706 4F) and a relative humidity between 50 to 70 %, unlessother
21、wise specified.8. Procedure8.1 Set the distance between the gripping portion of theclamps 75 mm (3 in.) apart.8.2 Clamp a specimen so that the specimen is centered inthe clamps with the sides of the clamps being parallel to thetested reinforcement.8.3 Elongate the specimen at a test speed of 300 mm/
22、min(12 in./min) until both the reinforcement and the polymericfilm or sheet has failed, recording the load-extension curve. Ifthe specimen slips in the clamps, breaks in the clamps, breaksat the edges of the clamps, the scrim pulls out and does notbreak, or if for any reason attributable to faulty o
23、peration, theresult falls markedly below the average for the set of speci-mens, discard the result and test an additional specimen.8.4 Record peak load, grip separation at peak load, load atfinal break and grip separation at final break.8.5 Repeat the procedure for the remaining specimens.9. Calcula
24、tion9.1 Calculate peak strength in force per unit width, kN/m(lb/in.), by dividing the maximum load by the original width ofthe specimen.9.2 Calculate elongation by dividing the grip movement by75 mm (3 in.), multiplying by 100 % and reporting in percent.9.3 Calculate the average and standard deviat
25、ion for peakstrength, elongation at peak strength, load at final break andelongation at final break. Calculate the results for each testdirection separately.10. Report10.1 Report the following information:10.1.1 Complete identification of the material tested,10.1.2 The direction of testing if other
26、than MD and TD,10.1.3 Any deviation of the specified test procedure,10.1.4 Any inability to prepare the tested specimens withoutcutting the reinforcing scrim in the test direction, and10.1.5 The average and standard deviation for peakstrength, elongation at peak strength, elongation at final breakan
27、d strength at final break. Report each test direction resultsseparately.11. Precision and Bias11.1 No precision and bias has been established yet for thistest standard.12. Keywords12.1 geomembrane; reinforced; strip tensile; tensileASTM International takes no position respecting the validity of any
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29、ion at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your c
30、omments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrig
31、hted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org).D7003032
