Designation:D4647/D4647M−13StandardTestMethodsforIdentificationandClassificationofDispersiveClaySoilsbythePinholeTest1ThisstandardisissuedunderthefixeddesignationD4647/D4647M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thistestmethodpresentsadirect,measurementofthedispersibilityandconsequentcolloidalerodibilityofclaysoilsbycausingwatertoflowthroughasmallholepunchedinaspecimen.Theresultsofthetestsarequalitativeandprovidegeneralguidanceregardingdispersibilityanderodibility.ThistestmethodiscomplementedbyTestMethodD4221.1.2Thistestmethodandthecriteriaforevaluatingtestdataarebaseduponresultsofseveralhundredtestsonsamplescollectedfromembankments,channels,andotherareaswhereclaysoilshaveerodedorresistederosioninnature(1).21.3Threealternativeproceduresforclassifyingthedispers-ibilityofclaysoilsareprovidedasfollows:1.3.1MethodAandMethodC,adaptedfromRef(1),classifysoilsintosixcategoriesofdispersivenessas:dispers-ibility(D1,D2),slighttomoderatelydispersive(ND4,ND3),andnondispersive(ND2,ND1).1.3.2MethodBclassifiessoilsintothreecategoriesofdispersivenessas:dispersibility(D),slightlydispersive(SD),andnondispersive(ND).1.4AllobservedandcalculatedvaluesshallconformtotheguidelinesforsignificantdigitsandroundingestablishedinPracticeD6026.1.5Units—ThevaluesstatedineitherSIunitsorinch-poundunitsaretoberegardedseparatelyasstandard.Thevaluesstatedineachsystemmaynotbeexactequivalents;therefore,eachsystemshallbeusedindependentlyoftheother.Combiningvaluesfromthetwosystemsmayresultinnon-conformancewiththestandard.1.6Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocum...
