Designation:D490−92(Reapproved2011)StandardSpecificationforRoadTar1ThisstandardisissuedunderthefixeddesignationD490;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheDepartmentofDefense.1.Scope1.1Thisspecificationcovers14gradesoftarasfollows:RT-1,RT-2,RT-3,RT-4,RT-5,RT-6,RT-7,RT-8,RT-9,RT-10,RT-11,RT-12,RT.C.B.-5,andRT.C.B.-6.2.ReferencedDocuments2.1ASTMStandards:2D4TestMethodforBitumenContentD20TestMethodforDistillationofRoadTarsD36TestMethodforSofteningPointofBitumen(Ring-and-BallApparatus)D70TestMethodforDensityofSemi-SolidBituminousMaterials(PycnometerMethod)D95TestMethodforWaterinPetroleumProductsandBituminousMaterialsbyDistillationD139TestMethodforFloatTestforBituminousMaterialsD140PracticeforSamplingBituminousMaterialsD1665TestMethodforEnglerSpecificViscosityofTarProducts3.PhysicalRequirements3.1ThetarshallconformtotherequirementsinTable1.4.Sampling4.1ThematerialshallbesampledinaccordancewithPracticeD140.5.TestMethods5.1ThepropertiesenumeratedinTable1shallbedeter-minedinaccordancewiththefollowingmethods,withtheexceptionofthetestspecifiedin5.1.3:5.1.1Water—TestMethodD95.5.1.2SpecificGravity—TestMethodD70.5.1.3SpecificViscosity—TestMethodD1665.Theresultsshallbereportedasspecificviscositycomparedwithwaterat25°C.5.1.4FloatTest—TestMethodD139.5.1.5Distillation—TestMethodD20.5.1.6SofteningPoint—TestMethodD36.5.1.7TotalBitumen—TestMethodD4.1ThisspecificationisunderthejurisdictionofASTMCommitteeD04onRoadandPavingMaterialsandisthedirectresponsibilityofSubcommitteeD04.43onSpecificationsandTestforTarandTarProducts.CurrenteditionapprovedDec.1,2011.PublishedDecember2011.Originallyapprovedin1938.Lastpreviouseditionapprovedin2001asD490–92(2005).DOI:10.1520/D0490-92R11.2ForreferencedASTMstandards,visittheASTMweb...
