1、Designation: D 7275 07Standard Test Method forTensile Properties of Bituminous Geomembranes (BGM)1This standard is issued under the fixed designation D 7275; 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 tensile proper-ties of bituminous geomembranes (BGM) using a dumbbellshape specimen.1.2 Th
3、e values stated in SI units are to 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
4、safety and health practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2D 638 Test Method for Tensile Properties of PlasticsD 4354 Practice for Sampling of Geosynthetics for TestingD 4439 Terminology for GeosyntheticsD 6455 Guide
5、 for the Selection of Test Methods for Prefab-ricated Bituminous Geomembranes (PBGM)3. Terminology3.1 Definition of Term Specific to This Standard:3.1.1 prefabricated bituminous geomembrane (BGM), namaterial fabricated in a plant and consisting principally ofnon-woven geotextile, impregnated by a bl
6、end of oxidized orpolymer-modified bitumen incorporating filler.3.2 For definitions of other terms used in this test method,refer to Terminology D 4439.4. Significance and Use4.1 This method is used to evaluate the tensile properties ofBGM. It can be used for manufacturing quality control oracceptan
7、ce testing.4.2 This test method uses a dumbbell specimen. The shapeand dimensions of the specimen are defined in this standard.No other shape or dimensions are allowed. Other mechanicalproperties of BGM may be measured using different testmethods. Refer to Guide D 6455.4.3 The reported properties ar
8、e the maximum strength andelongation at maximum strength.5. Apparatus5.1 Tensile instrumentation shall meet the requirementsoutlined in Test Method D 638.5.2 GripsOne of the grips must be self aligning tocompensate for uneven distribution of force across the speci-men. The clamping force and the cla
9、mp surfaces shall hold thespecimen firmly without causing damage.5.3 Grip FacesGrip faces shall be a minimum of 50 mm(2 in.) wide and a minimum of 50 mm (2 in.) in length. Smoothrubber, fine serrated or coarse serrated grip faces have all beenfound to be suitable for testing BGM. If needed, the use
10、of asilicone-coated paper to help holding the specimen ends intothe grips is recommended. The silicone-coated side is to beused in contact with the specimen.6. Sampling and Test Specimens6.1 Sampling shall be conducted according to PracticeD 4354.6.2 Take a sample that will exclude material from the
11、 outerwrap of the roll or the inner wrap around the core. In the casewhere the sample is taken at the production site, material fromthe outer wrap may be used if it is undamaged.6.3 Test SpecimensPrepare five specimens with the lengthof the specimen parallel to the machine direction (MD) and fivespe
12、cimens with the length parallel to the cross-machine direc-tion (XD).6.4 The specimens shall be cut using an appropriate die tothe shape, dimensions, and tolerances presented in Fig. 1.7. Conditioning and Testing7.1 Samples shall be conditioned for at least 24 h at 21 62C (70 6 4F) and 50 70 % relat
13、ive humidity. The samplesshall be conditioned flat and shielded from the sun.7.2 Testing shall be conducted at 21 6 2C (70 6 4F) and50 70 % relative humidity.1This test method is under the jurisdiction of ASTM Committee D35 onGeosynthetics and is the direct responsibility of Subcommittee D35.10 on G
14、eomem-branes.Current edition approved Dec. 1, 2007. Published January 2008. Originallyapproved in 2006. Last previous edition approved in 2006 as D 7275 06.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of AST
15、MStandards 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.8. Procedure8.1 Clamp a specimen so that the specimen is centered inthe clamps with the si
16、des of the clamps being parallel to the testdirection.8.2 Elongate the specimen to rupture at a test speed of 50mm/min (2 in./min). If the specimen slips in the clamps, breaksin the clamps, breaks outside its narrow section, or if for anyreason attributable to faulty operation, the result falls mark
17、edlybelow the average for the set of specimens, discard the resultand test an additional specimen.8.3 Record the maximum load and grip separation at maxi-mum load.8.4 Repeat the procedure for the remaining specimens.9. Calculation9.1 Calculate the maximum strength of individual speci-mens in force p
18、er unit width, kN/m (lbf/in.), by dividing themaximum load (in kN) by the width of each specimen in itsnarrow section (0.025 m).9.2 Calculate the elongation at maximum strength of eachindividual specimen by dividing the increase in grip separationat maximum load (in mm) by the initial nominal length
19、 of thespecimens narrow section (60 mm), expressed as a percentage.9.3 Calculate the average and standard deviation for maxi-mum strength and elongation at maximum strength. Calculatethe results for each test direction separately.10. Report10.1 Report the following information:10.1.1 Complete identi
20、fication of the material tested,10.1.2 Test temperature,10.1.3 Any deviation of the specified test procedure,10.1.4 Each individual specimen maximum strength andelongation at maximum strength, and10.1.5 The average and standard deviation for maximumstrength and elongation at maximum strength. Report
21、 each testdirection results separately.11. Precision and Bias11.1 The precision and bias of this test method have notbeen established yet.12. Keywords12.1 BGM; bituminous geomembrane; elongation; me-chanical properties; tensileASTM International takes no position respecting the validity of any paten
22、t rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision a
23、t 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 commen
24、ts 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 copyrighted
25、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).a 125 6 1mm(4.926 0.04 in.) r 12.5 6 1 mm (0.492 6 0.04 in.)b856 1mm(3.356 0.04 in,) y 50 6 1mm(1.976 0.04 in.)c606 1mm(2.366 0.04 in.) z 25 6 0.25 mm (0.984 6 0.1 in.)FIG. 1 Shape, Dimensions, and Tolerances for Dumbbell SpecimenD7275072
