Designation:D7402−09(Reapproved2017)StandardPracticeforIdentifyingCationicEmulsifiedAsphalts1ThisstandardisissuedunderthefixeddesignationD7402;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thispracticeisusedtoidentifycationicemulsifiedasphalts.Positivelychargedparticlesareclassifiedascationic.Emulsifiedasphaltsthatdon’tregisterapositivechargemayalsobeclassifiedascationicslow-settingiftheycoataspecifictypeofnegativelychargedsilicasand.1.2ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.1.4Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2C778SpecificationforStandardSandD2397SpecificationforCationicEmulsifiedAsphaltE1SpecificationforASTMLiquid-in-GlassThermometers3.SignificanceandUse3.1Cationicemulsifiedasphaltsareidentifiedbythemigra-tionoftheparticlestoanegativelychargedelectrode(cathode)bymeansofadirectcurrent.Aggregatesandsandsusedinconjunctionwithemulsifiedasphaltsareoftenpredominantlyeithernegativelyorpositivelycharged.Emulsifiedasphaltsshouldbeselectedtobecompatiblewiththeavailableaggre-gateorsand.ThispracticewillaidinidentifyingacationictypeofemulsifiedasphaltasdefinedbySpecificationD2397.4.SampleConditioningforTesting4.1Allemulsifiedasphaltsshallbeproperlystirredtoachi...
