Designation:D7643−16StandardPracticeforDeterminingtheContinuousGradingTemperaturesandContinuousGradesforPGGradedAsphaltBinders1ThisstandardisissuedunderthefixeddesignationD7643;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1ThispracticeisusedtoestimatethecontinuousgradingtemperaturesandcontinuousgradeforanasphaltbindergradedinaccordancewiththerequirementsspecifiedinSpecificationD6373.1.2ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D8TerminologyRelatingtoMaterialsforRoadsandPave-mentsD2872TestMethodforEffectofHeatandAironaMovingFilmofAsphalt(RollingThin-FilmOvenTest)D6373SpecificationforPerformanceGradedAsphaltBinderD6521PracticeforAcceleratedAgingofAsphaltBinderUsingaPressurizedAgingVessel(PAV)D6648TestMethodforDeterminingtheFlexuralCreepStiffnessofAsphaltBinderUsingtheBendingBeamRheometer(BBR)D6723TestMethodforDeterminingtheFracturePropertiesofAsphaltBinderinDirectTension(DT)D6816PracticeforDeterminingLow-TemperaturePerfor-manceGrade(PG)ofAsphaltBindersD7175TestMethodforDeterminingtheRheologicalProp-ertiesofAsphaltBinderUsingaDynamicShearRheom-eter3.Terminology3.1Definitions:DefinitionsformanytermscommontoasphaltcementandasphaltbinderarefoundinTerminologyD8.3.2DefinitionsofTermsSpecifictoThisStandard:3.2.1continuousgrade,n—agradedefinedbytheestimatedupperandlowercontinuousgradingtemperatures.3.2.2continuousgradingtemperatures,Tc,n—theestimatedtemperaturesatwhichthepropertiesofanasphaltbinderareequaltothespecifica...
