Designation:D422−63(Reapproved2007)´2StandardTestMethodforParticle-SizeAnalysisofSoils1ThisstandardisissuedunderthefixeddesignationD422;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ε1NOTE—EditorialchangesmadethroughoutinFebruary2014.ε2NOTE—FurthereditorialcorrectionsmadeinJuly2014.1.Scope1.1Thistestmethodcoversthequantitativedeterminationofthedistributionofparticlesizesinsoils.Thedistributionofparticlesizeslargerthan75µm(retainedontheNo.200sieve)isdeterminedbysieving,whilethedistributionofparticlesizessmallerthan75µmisdeterminedbyasedimentationprocess,usingahydrometertosecurethenecessarydata(Note1andNote2).NOTE1—SeparationmaybemadeontheNo.4(4.75-mm),No.40(425-µm),orNo.200(75-µm)sieveinsteadoftheNo.10.Forwhateversieveused,thesizeshallbeindicatedinthereport.NOTE2—Twotypesofdispersiondevicesareprovided:(1)ahigh-speedmechanicalstirrer,and(2)airdispersion.Extensiveinvestigationsindicatethatair-dispersiondevicesproduceamorepositivedispersionofplasticsoilsbelowthe20-µmsizeandappreciablylessdegradationonallsizeswhenusedwithsandysoils.Becauseofthedefiniteadvantagesfavoringairdispersion,itsuseisrecommended.Theresultsfromthetwotypesofdevicesdifferinmagnitude,dependinguponsoiltype,leadingtomarkeddifferencesinparticlesizedistribution,especiallyforsizesfinerthan20µm.2.ReferencedDocuments2.1ASTMStandards:2D421PracticeforDryPreparationofSoilSamplesforParticle-SizeAnalysisandDeterminationofSoilCon-stantsE11SpecificationforWovenWireTestSieveClothandTestSievesE100SpecificationforASTMHydrometers2.2ASTMAdjuncts:Air-JetDispersionCupforGrain-SizeAnalysisofSoil33.Apparatus3.1Balances—Abalancesensitiveto0.01gforweighingthematerialpassingaNo.10(2.00-mm)sieve,andabalancesensitiveto0.1%ofthemassofthesampletobeweighedforweighingthematerialretainedonaNo.10sieve.3.2Stirr...
