Designation:D698−12(Reapproved2021)StandardTestMethodsforLaboratoryCompactionCharacteristicsofSoilUsingStandardEffort(12,400ft-lbf/ft3(600kN-m/m3))1ThisstandardisissuedunderthefixeddesignationD698;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope1.1Thesetestmethodscoverlaboratorycompactionmeth-odsusedtodeterminetherelationshipbetweenmoldingwatercontentanddryunitweightofsoils(compactioncurve)compactedina4or6-in.(101.6or152.4-mm)diametermoldwitha5.50-lbf(24.5-N)rammerdroppedfromaheightof12.0in.(305mm)producingacompactiveeffortof12400ft-lbf/ft3(600kN-m/m3).NOTE1—TheequipmentandproceduresaresimilarasthoseproposedbyR.R.Proctor(EngineeringNewsRecord—September7,1933)withthisonemajorexception:hisrammerblowswereappliedas“12inchfirmstrokes”insteadoffreefall,producingvariablecompactiveeffortdepend-ingontheoperator,butprobablyintherange15000to25000ft-lbf/ft3(700to1200kN-m/m3).Thestandardefforttest(see3.1.4)issometimesreferredtoastheProctorTest.1.1.1Soilsandsoil-aggregatemixturesaretoberegardedasnaturaloccurringfine-orcoarse-grainedsoils,orcompositesormixturesofnaturalsoils,ormixturesofnaturalandprocessedsoilsoraggregatessuchasgravelorcrushedrock.Hereafterreferredtoaseithersoilormaterial.1.2Thesetestmethodsapplyonlytosoils(materials)thathave30%orlessbymassofparticlesretainedonthe3⁄4-in.(19.0-mm)sieveandhavenotbeenpreviouslycompactedinthelaboratory;thatis,donotreusecompactedsoil.1.2.1Forrelationshipsbetweenunitweightsandmoldingwatercontentsofsoilswith30%orlessbymassofmaterialretainedonthe3⁄4-in.(19.0-mm)sievetounitweightsandmoldingwatercontentsofthefractionpassing3⁄4-in.(19.0-mm)sieve,seePracticeD4718/D4718M.1.3Threealternativemethodsareprovided.Themethodusedshallbeasindicatedinthespecif...
