Designation:D5874−16StandardTestMethodsforDeterminationoftheImpactValue(IV)ofaSoil1ThisstandardisissuedunderthefixeddesignationD5874;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1ThesetestmethodscoverthedeterminationoftheImpactValue(IV)ofasoileitherinthefieldoratestmold,asfollows:1.1.1FieldProcedureA—DeterminationofIValone,inthefield.1.1.2FieldProcedureB—DeterminationofIVandwatercontent,inthefield.1.1.3FieldProcedureC—DeterminationofIV,watercontent,anddrydensity,inthefield.1.1.4MoldProcedure—DeterminationofIVofsoilcom-pactedinamold,inthelab.1.2Thestandardtestmethod,usinga4.5kg(10lbm)hammer,issuitablefor,butnotlimitedto,evaluatingthestrengthofanunsaturatedcompactedfill,inparticularpave-mentmaterials,soils,andsoil-aggregateshavingmaximumparticlesizeslessthan37.5mm(1.5in.).1.3Byusingalighter0.5kg(1.1lbm)or2.25kg(5lbm)hammer,thistestmethodisapplicableforevaluatinglowerstrengthsoilssuchasfinegrainedcohesionless,highlyorganic,saturated,orhighlyplasticsoilshavingamaximumparticlesizelessthan9.5mm(0.375in.),ornaturalturfgrass.1.4Byusingaheavier10kg(22lbm)or20kg(44lbm)hammer,thistestmethodisapplicableforevaluatingforhardermaterialsatthetopendthescalesorbeyondtherangesofthestandardandlighterimpactsoiltesters.1.5Byperforminglaboratorytestcorrelationsforaparticu-larsoilusingthe4.5kg(10lbm)hammer,IVmaybecorrelatedwithanunsoakedCaliforniaBearingRatio(CBR)ormaybeusedtoinferpercentagecompaction.1.6ThevaluesstatedSIaretoberegardedasthestandard.Thevaluesstatedinparenthesesaregivenforinformationonly.1.7AllobservedandcalculatedvaluesshallconformtotheguidelinesforsignificantdigitsandroundingestablishedinPracticeD6026.1.8Forpurposesofcomparing,ameasuredorcalculatedvalue(s)withspecifiedlimits,themeasuredorcalculatedvalue(s)shallberoundedtothenearestdecimalorsignif...
