Designation:D3497–79(Reapproved2003)StandardTestMethodforDynamicModulusofAsphaltMixtures1ThisstandardisissuedunderthefixeddesignationD3497;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(e)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversproceduresforpreparingandtestingasphaltmixturestodeterminedynamicmodulusvalues.Theproceduredescribedcoversarangeofbothtemperatureandloadingfrequency.Theminimumrecommendedtestseriesconsistsoftestingat41,77,and104°F(5,25,and40°C)atloadingfrequenciesof1,4,and16Hzforeachtemperature.1.2Thismethodisapplicabletoasphaltpavingmixturessimilartomixes3A,4A,5A,6A,and7A,asdefinedbySpecificationD3515.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2C617PracticeforCappingCylindricalConcreteSpeci-mensD3496MethodforPreparationofBituminousMixtureSpecimensforDynamicModulusTestingD3515SpecificationforHot-Mixed,Hot-LaidBituminousPavingMixtures3.Terminology3.1Definitions:3.1.1dynamicmodulus—theabsolutevalueofthecomplexmodulusthatdefinestheelasticpropertiesofalinearviscoelas-ticmaterialsubjectedtoasinusoidalloading,?E*?3.1.2complexmodulus—acomplexnumberthatdefinestherelationshipbetweenstressandstrainforalinearviscoelasticmaterial,E*.3.1.3linearmaterial—amaterialwhosestresstostrainratioisindependentoftheloadingstressapplied.4.SummaryofTestMethod4.1Asinusoidal(haversine)axialcompressionstressisappliedtoaspecimenofasphaltconcreteatagiventempera-tureandloadingfrequency.Theresultingrecoverableaxialstrainresponseofthespecimenismeasuredandusedtocalculatedynamicmodulus.5.SignificanceandUse5.1Thevaluesofdynamicmoduluscanbeusedforbothasphaltpavin...
