ASTM D6637-2011 6875 Standard Test Method for Determining Tensile Properties of Geogrids by the Single or Multi-Rib Tensile Method《单边或多边拉伸法土工格栅拉伸性能测定的标准试验方法》.pdf
《ASTM D6637-2011 6875 Standard Test Method for Determining Tensile Properties of Geogrids by the Single or Multi-Rib Tensile Method《单边或多边拉伸法土工格栅拉伸性能测定的标准试验方法》.pdf》由会员分享,可在线阅读,更多相关《ASTM D6637-2011 6875 Standard Test Method for Determining Tensile Properties of Geogrids by the Single or Multi-Rib Tensile Method《单边或多边拉伸法土工格栅拉伸性能测定的标准试验方法》.pdf(6页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: D6637 11Standard Test Method forDetermining Tensile Properties of Geogrids by the Single orMulti-Rib Tensile Method1This standard is issued under the fixed designation D6637; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revis
2、ion, the year of last 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 covers the determination of the tensilestrength properties of geogrids by subjecting
3、 strips of varyingwidth to tensile loading.1.2 Three alternative procedures are provided to determinethe tensile strength, as follows:1.2.1 Method ATesting a single geogrid rib in tension (Nor lbf).1.2.2 Method BTesting multiple geogrid ribs in tension(kN/m or lbf/ft).1.2.3 Method CTesting multiple
4、layers of multiplegeogrid ribs in tension (kN/m or lbf/ft).1.3 This test method is intended for quality control andconformance testing of geogrids.1.4 The values stated in SI units are to be regarded as thestandard. The inch-pound values stated in parentheses areprovided for information only.1.5 Thi
5、s standard may involve hazardous materials, opera-tions, and equipment. This standard does not purport toaddress all of the safety concerns, if any, associated with itsuse. It is the responsibility of the user of this standard toestablish appropriate safety and health practices and deter-mine the ap
6、plicability of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2D76 Specification for Tensile Testing Machines for TextilesD123 Terminology Relating to TextilesD1909 Standard Table of Commercial Moisture Regains forTextile FibersD4354 Practice for Sampling of Geosynthet
7、ics for TestingD4439 Terminology for GeosyntheticsD5262 Test Method for Evaluating the Unconfined TensionCreep and Creep Rupture Behavior of Geosynthetics3. Terminology3.1 Definitions:3.1.1 atmosphere for testing geosynthetics, nair main-tained at a relative humidity of 50 to 70 % and a temperatureo
8、f 21 6 2C (70 6 4F).3.1.2 breaking force, (F), nthe force at failure.3.1.3 corresponding force, nsynonym for force at speci-fied elongation.3.1.4 force at specified elongation, FASE, na force asso-ciated with a specific elongation on the force-elongation curve(synonym for corresponding force.)3.1.5
9、force-elongation curve, nin a tensile test, a graphi-cal representation of the relationship between the magnitude ofan externally applied force and the change in length of thespecimen in the direction of the applied force (synonym forstress-strain curve.)3.1.6 geogrid, na geosynthetic formed by a re
10、gular net-work of integrally connected elements with aperetures greaterthan 6.35 mm (14 in.) to allow interlocking with surroundingsoil, rock, earth, and other surrounding materials to primarilyfunction as reinforcement. D52623.1.7 geosynthetic, na product manufactured from poly-meric material used
11、with soil, rock, earth, or other geotechnicalengineering related material as an integral part of a man madeproject, structure, or system.3.1.8 index test, na test procedure which may containknown bias, but which may be used to establish an order for aset of specimens with respect to the property of
12、interest.3.1.9 integral, adjin geosynthetics, forming a necessarypart of the whole; a constituent.3.1.10 junction, nthe point where geogrid ribs are inter-connected to provide structure and dimensional stability.3.1.11 rib, nfor geogrids, the continuous elements of ageogrid which are interconnected
13、to a node or junction.3.1.12 rupture, nfor geogrids, the breaking or tearingapart of ribs.3.1.13 tensile, adjcapable of tensions, or relating to ten-sion of a material.1This test method is under the jurisdiction of ASTM Committee D35 onGeosynthetics and is the direct responsibility of Subcommittee D
14、35.01 on Mechani-cal Properties.Current edition approved Oct. 1, 2011. Published October 2011. Originallyapproved in 2001. Last previous edition approved in 2010 as D663701(2010).DOI: 10.1520/D6637-11.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Servi
15、ce at serviceastm.org. For Annual 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.3.1.14 tensile strength, (af), nfor geogrids
16、the maximumresistance to deformation developed for a specific materialwhen subjected to tension by an external force. Tensile strengthof geogrids is the characteristic of a sample as distinct from aspecimen and is expressed in force per unit width.3.1.15 tensile test, nfor geosynthetics, a test in w
17、hich amaterial is stretched uniaxially to determine the force-elongation characteristics, the breaking force, or the breakingelongation.3.1.16 tension, nthe force that produces a specified elon-gation.3.2 For definitions of other terms used in this test method,refer to Terminologies D123 and D4439.4
18、. Summary of Test Method4.1 Method AIn this method, a single, representative ribspecimen of a geogrid is clamped and placed under a tensileforce using a constant rate of extension testing machine. Thetensile force required to fail (rupture) the specimen is recorded.The ultimate single rib tensile st
19、rength (N or lbf) is thendetermined based on the average of six single rib tensile tests.4.2 Method BA relatively wide specimen is grippedacross its entire width in the clamps of a constant rate ofextension type tensile testing machine operated at a prescribedrate of extension, applying a uniaxial l
20、oad to the specimen untilthe specimen ruptures. Tensile strength (kN/m or lbf/ft),elongation, and secant modulus of the test specimen can becalculated from machine scales, dials, recording charts, or aninterfaced computer.4.3 Method CA relatively wide, multiple layered speci-men is gripped across it
21、s entire width in the clamps of aconstant rate of extension type tensile testing machine operatedat a prescribed rate of extension, applying a uniaxial load to thespecimen until the specimen ruptures. Tensile strength (kN/mor lbf/ft), elongation and secant modulus of the test specimencan be calculat
22、ed from machine scales, dials recording charts,or an interfaced computer.5. Significance and Use5.1 The determination of the tensile force-elongation valuesof geogrids provides index property values. This test methodshall be used for quality control and acceptance testing ofcommercial shipments of g
23、eogrids.5.2 In cases of dispute arising from differences in reportedtest results when using this test method for acceptance testingof commercial shipments, the purchaser and supplier shouldconduct comparative tests to determine if there is a statisticalbias between their laboratories. Competent stat
24、istical assis-tance is recommended for the investigation of bias. As aminimum, the two parties should take a group of test speci-mens which are as homogeneous as possible and which arefrom a lot of material of the type in question. The testspecimens should then be randomly assigned in equal numberst
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