AASHTO-T-315-2008

TS-2bT315-1AASHTOStandardMethodofTestforDeterminingtheRheologicalPropertiesofAsphaltBinderUsingaDynamicShearRheometer(DSR)AASHTODesignation:T315-081.SCOPE1.1.Thistestmethodcoversthedeterminationofthedynamicshearmodulusandphaseangleofasphaltbinderwhentestedindynamic(oscillatory)shearusingparallelplatetestgeometry.Itisapplicabletoasphaltbindershavingdynamicshearmodulusvaluesintherangefrom100Pato10MPa.Thisrangeinmodulusistypicallyobtainedbetween6and88°Catanangularfrequencyof10rad/s.Thistestmethodisintendedfordeterminingthelinearviscoelasticpropertiesofasphaltbindersasrequiredforspecificationtestingandisnotintendedasacomprehensiveprocedureforthefullcharacterizationoftheviscoelasticpropertiesofasphaltbinder.1.2.ThisstandardisappropriateforunagedmaterialormaterialagedinaccordancewithT240andR28.1.3.Particulatematerialintheasphaltbinderislimitedtoparticleswithlongestdimensionslessthan250ȝm.1.4.Thisstandardmayinvolvehazardousmaterials,operations,andequipment.Thisstandarddoesnotpurporttoaddressallofthesafetyconcernsassociatedwithitsuse.Itistheresponsibilityoftheuserofthisproceduretoestablishappropriatesafetyandhealthpracticesandtodeterminetheapplicabilityofregulatorylimitationspriortouse.2.REFERENCEDDOCUMENTS2.1.AASHTOStandards:M320,Performance-GradedAsphaltBinderR28,AcceleratedAgingofAsphaltBinderUsingaPressurizedAgingVessel(PAV)R29,GradingorVerifyingthePerformanceGrade(PG)ofanAsphaltBinderT40,SamplingBituminousMaterialsT240,EffectofHeatandAironaMovingFilmofAsphalt(RollingThin-FilmOvenTest)2.2.ASTMStandards:C670,PracticeforPreparingPrecisionandBiasStatementsforTestMethodsforConstructionMaterialsE1,SpecificationforASTMThermometersE77,StandardTestMethodforInspectionandVerificationofThermometersTS-2bT315-2AASHTOE563,StandardPracticeforPreparationandUseofanIce-PointBathasaReferenceTemperatureE644,StandardTestMethodsforTestingIndustrialResistanceThermometersD2170,StandardTestMethodforKinematicViscosityofAsphalts(Bitumens)D2171,StandardTestMethodforViscosityofAsphaltsbyVacuumCapillaryViscometer2.3.DeutscheIndustrieNorm(DIN)Standards:43760,StandardforCalibrationsofThermocouples3.TERMINOLOGY3.1.Definitions:3.1.1.asphaltbinder—anasphalt-basedcementthatisproducedfrompetroleumresidueeitherwithorwithouttheadditionofnon-particulateorganicmodifiers.3.2.DescriptionsofTermsSpecifictoThisStandard:3.2.1.annealing—heatingthebinderuntilitissufficientlyfluidtoremovetheeffectsofsterichardening.3.2.2.complexshearmodulus(G*)—ratiocalculatedbydividingtheabsolutevalueofthepeak-to-peakshearstress,IJ,bytheabsolutevalueofthepeak-to-peakshearstrain,Ȗ.3.2.3.calibration—processofcheckingtheaccuracyandprecisionofadeviceusingNIST-traceablestandardsandmakingadjustmentstothedevicewherenecessarytocorrectitsoperationorprecisionandaccuracy.3.2.4.dummytestspecimen—aspecimenformedbetweenthedynamicshearrheometer(DSR)testplatesfromasphaltbinderorotherpolymertomeasurethetemperatureoftheasphaltbinderheldbetweentheplates.Thedummytestspecimenisusedsolelytodeterminetemperaturecorrections.3.2.5.loadingcycle—aunitcycleoftimeforwhichthetestsampleisloadedataselectedfrequencyandstressorstrainlevel.3.2.6.phaseangle(į)—theangleinradiansbetweenasinusoidallyappliedstrainandtheresultantsinusoidalstressinacontrolled-straintestingmode,orbetweentheappliedstressandtheresultantstraininacontrolled-stresstestingmode.3.2.7.lossshearmodulus(G″)—thecomplexshearmodulusmultipliedbythesineofthephaseangleexpressedindegrees.Itrepresentsthecomponentofthecomplexmodulusthatisameasureoftheenergylost(dissipatedduringaloadingcycle).3.2.8.storageshearmodulus(G′)—thecomplexshearmodulusmultipliedbythecosineofthephaseangleexpressedindegrees.Itrepresentsthein-phasecomponentofthecomplexmodulusthatisameasureoftheenergystoredduringaloadingcycle.3.2.9.parallelplategeometry—referstoatestinggeometryinwhichthetestsampleissandwichedbetweentworelativelyrigidparallelplatesandsubjectedtooscillatoryshear.TS-2bT315-3AASHTO3.2.10.oscillatoryshear—referstoatypeofloadinginwhichashearstressorshearstrainisappliedtoatestsampleinanoscillatorymannersuchthattheshearstressorstrainvariesinamplitudeaboutzeroinasinusoidalmanner.3.2.11.linearviscoelastic—withinthecontextofthisspecificationreferstoaregionofbehaviorinwhichthedynamicshearmodulusisindependentofshearstressorstrain.3.2.12.portablethermometer—isanelectronicdevicethatconsistsofatemperaturedetector(probecontainingathermocoupleorresistiveelement),requiredelectroniccircuitry,andreadoutsystem.3.2.13.referencethermometer—aNIST–traceableliquid-in-glassorelectronicthermometerthatisusedasalaboratorystandard.3.2.14.temperaturecorrection—differenceintemperaturebetweenthetemperatureindicatedbytheDSRandthetestspecimenasmeasuredbytheportablethermometerinsertedbetweenthetestplates.3.2.15.thermalequilibrium—isreachedwhenthetemperatureofthetestspecimenmountedbetweenthetestplatesisconstantwithtime.3.2.16.verification—processofcheckingtheaccuracyofadeviceoritscomponentsagainstaninternallaboratorystandard.Itisusuallyperformedwithintheoperatinglaboratory.3.2.17.stericharden