ASTM_D_7361_-_07_2018.pdf

Designation:D736107(Reapproved 2018)Standard Test Method forAccelerated Compressive Creep of Geosynthetic MaterialsBased on Time-Temperature Superposition Using theStepped Isothermal Method1This standard is issued under the fixed designation D7361;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 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 accelerated testing for compres-sive creep properties using the stepped isothermal method(SIM).1.2 The test method is focused on geosynthetic drainagematerials such as HDPE geonet specimens.1.3The SIM tests are laterally unconfined tests based ontime-temperature superposition procedures.1.4 Ramp and hold(R+H)tests may be completed inconjunction with SIM tests.They are designed to provideadditional estimates of the initial rapid compressive creepstrain levels appropriate for the SIM results.1.5 This method can be used to establish the sustained loadcompressive creep characteristics of a geosynthetic that dem-onstrates a relationship between time-dependent behavior andtemperature.Results of this method are to be used to augmentresults of compressive creep tests performed at 20 6 1 C andmay not be used as the sole basis for determination oflong-term compressive creep behavior of geosynthetic mate-rial.1.6 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are for informationonly.1.7 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,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.8 This international standard was developed in accor-dance with internationally recognized principles on standard-ization 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:2D1621 Test Method for Compressive Properties of RigidCellular PlasticsD2990 Test Methods for Tensile,Compressive,and FlexuralCreep and Creep-Rupture of PlasticsD4439 Terminology for GeosyntheticsD5262 Test Method for Evaluating the Unconfined TensionCreep and Creep Rupture Behavior of GeosyntheticsD6364 Test Method for Determining Short-Term Compres-sion Behavior of Geosynthetics3.Terminology3.1 Definitions:3.1.1 For definitions related to geosynthetics,see Terminol-ogy D4439.3.1.2 For definitions related to creep,see Test MethodsD2990 and D5262 and Terminology D4439.3.2 Definitions of Terms Specific to This Standard:3.2.1 compressive creeptime-dependent deformation thatoccurs when a specimen is subjected to a constant compressiveload.3.2.2 compressive creep modulusin SIM analysis,the loaddivided by the percent compressive strain at any given point intime.3.2.3 dwell timetime during which conditions(particularload)are held constant between temperature steps.3.2.4 mean test temperaturethe arithmetic average of alltemperature readings of the atmosphere surrounding the testspecimen for a particular temperature step,starting at a timenot later than established temperature ramp time,and finishingat a time just prior to the subsequent temperature reset.1This test method is under the jurisdiction of ASTM Committee D35 onGeosynthetics and is the direct responsibility of Subcommittee D35.02 on Endur-ance Properties.Current edition approved Feb.1,2018.Published February 2018.Originallyapproved in 2007.Last previous edition approved in 2012 as D7361 07(2012).DOI:10.1520/D7361-07R18.2For 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 Harbor 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 issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 3.2.5 offset modulus method or pointingdata analysismethod used to normalize any prestrain in the samples byshifting the origin of a stress-versus-strain curve to an axisorigin of coordinates,that is,to coordinates(0,0).3.2.6 ramp and hold(R+H)testa creep test of very shortduration,for example,100 to 1000 s.3.2.7 shift factorthe displacement along the log time axisby which a section of the creep or creep modulus curve ismoved to create the master curve at the reference