1、Designation:D727507(Reapproved 2012)Standard Test Method forTensile Properties of Bituminous Geomembranes(BGM)1This standard is issued under the fixed designation D7275;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last
2、 revision.A number 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 tensile proper-ties of bituminous geomembranes(BGM)using a dumbbellshape specimen.1.2 T
3、he 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 saf
4、ety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D638 Test Method for Tensile Properties of PlasticsD4354 Practice for Sampling of Geosynthetics and RolledErosion Control Products(RECPs)for TestingD4439 Termino
5、logy for GeosyntheticsD6455 Guide for the Selection of Test Methods for Prefab-ricated Bituminous Geomembranes(PBGM)3.Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 prefabricated bituminous geomembrane(BGM),namaterial fabricated in a plant and consisting principally ofnon-woven
6、geotextile,impregnated by a blend of oxidized orpolymer-modified bitumen incorporating filler.3.2 For definitions of other terms used in this test method,refer to Terminology D4439.4.Significance and Use4.1 This method is used to evaluate the tensile properties ofBGM.It can be used for manufacturing
7、 quality control oracceptance 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 D6455.4.3 The
8、 reported properties are the maximum strength andelongation at maximum strength.5.Apparatus5.1 Tensile instrumentation shall meet the requirementsoutlined in Test Method D638.5.2 GripsOne of the grips must be self aligning tocompensate for uneven distribution of force across the speci-men.The clampi
9、ng force and the clamp 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 ne
10、eded,the use 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 PracticeD4354.6.2 Take a sample that will exclude materia
11、l from the 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 f
12、ivespecimens 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.1.1This test method is under the jurisdiction of ASTM Committee D35 onGeosynthetics and is the direct responsibilit
13、y of Subcommittee D35.10 on Geomem-branes.Current edition approved Jan.1,2012.Published January 2012.Originallyapproved in 2006.Last previous edition approved in 2007 as D7275 07.DOI:10.1520/D7275-07R12.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Servic
14、e 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 7.Conditioning and Testing7.1 Samples shall be condit
15、ioned for at least 24 h at 21 62C(70 6 4F)and 50 70%relative 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.8.Procedure8.1 Clamp a specimen so that the specimen is centered inthe clamps with the sid
16、es 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 markedlybelow 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 sp