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1、Designation:D1883?14StardTestMethodfCalifniaBearingRatio(CBR)ofLabatyCompactedSoils1ThisstardisissuedunderthefixeddesignationD1883thenumberimmediatelyfollowingthedesignationindicatestheyearofiginaladoptioninthecaseofrevi

2、siontheyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperepsilon()indicatesaneditialchangesincethelastrevisionreapproval.ThisstardhasbeenapprovedfusebyagenciesoftheU.S.DepartmentofDefense.1.Sc

3、ope1.1ThistestmethodcoversthedeterminationoftheCalifniaBearingRatio(CBR)ofpavementsubgradesubbasebasecoursematerialsfromlabatycompactedspecimens.Thetestmethodisprimarilyintendedfbutnotlimitedtoevaluatingthestrengthofmate

4、rialshavingmaximumparticlesizelessthan3?4in.(19mm).1.2Whenmaterialshavingamaximumparticlesizegreaterthan3?4in.(19mm)aretobetestedthistestmethodprovidesfmodifyingthegradationofthematerialsothatthematerialusedftestsallpass

5、esthe3?4in.(19mm)sievewhilethetotalgravel(3in.(75mm)toplusNo.4(4.75mm))fractionremainsthesame.Whiletraditionallythismethodofspecimenpreparationhasbeenusedtoavoidtheerrinherentintestingmaterialscontaininglargeparticlesint

6、heCBRtestapparatusthemodifiedmaterialmayhavesignificantlydifferentstrengthpropertiesthantheiginalmaterial.Howeveralargeexperiencedatabasehasbeendevelopedusingthistestmethodfmaterialsfwhichthegradationhasbeenmodifiedsatis

7、factydesignmethodsareinusebasedontheresultsoftestsusingthisprocedure.1.3PastpracticehasshownthatCBRresultsfthosematerialshavingsubstantialpercentagesofparticlesretainedontheNo.4(4.75mm)sievearemevariablethanffinermateria

8、ls.ConsequentlymetrialsmayberequiredfthesematerialstoestablishareliableCBR.1.4ThistestmethodprovidesfthedeterminationoftheCBRofamaterialatoptimumwatercontentarangeofwatercontentfromaspecifiedcompactiontestaspecifieddryun

9、itweight.ThedryunitweightisusuallygivenasapercentageofmaximumdryunitweightdeterminedbyTestMethodsD698D1557.1.5TheclientrequestingthetestmayspecifythewatercontentrangeofwatercontentsthedryunitweightfwhichtheCBRisdesired.1

10、.6Unlessspecifiedotherwisebytherequestingclientunlessithasbeenshowntohavenoeffectontestresultsfthematerialbeingtestedallspecimensshallbesoakedpritoperation.1.7FthedeterminationofCBRoffieldinplacematerialsseeTestMethodD44

11、29.1.8Units—Thevaluesstatedininchpoundunitsaretoberegardedasstard.TheSIunitsgiveninparenthesesaremathematicalconversionswhichareprovidedfinfmationpurposesonlyarenotconsideredstard.Reptingoftestresultsinunitsotherthaninch

12、poundunitsshallnotberegardedasnonconfmancewiththistestmethod.1.8.1Thegravitationalsystemofinchpoundunitsisusedwhendealingwithinchpoundunits.Inthissystemthepound(lbf)representsaunitoffce(weight)whiletheunitfmassisslugs.Th

13、eslugunitisnotgivenunlessdynamic(F=ma)calculationsareinvolved.1.8.2Theslugunitofmassisalmostneverusedincommercialpracticethatisdensitybalancesetc.Therefethestardunitfmassinthisstardiseitherkilogram(kg)gram(g)both.Alsothe

14、equivalentinchpoundunit(slug)isnotgivenpresentedinparentheses.1.8.3ItiscommonpracticeintheengineeringconstructionprofessionintheUnitedStatestoconcurrentlyusepoundstorepresentbothaunitofmass(lbm)offce(lbf).Thisimplicitlyc

15、ombinestwoseparatesystemsofunitsthatistheabsolutesystemthegravitationalsystem.Itisscientificallyundesirabletocombinetheuseoftwoseparatesetsofinchpoundunitswithinasinglestard.Asstatedthisstardincludesthegravitationalsyste

16、mofinchpoundunitsdoesnotusepresenttheslugunitfmass.Howevertheuseofbalancesscalesrecdingpoundsofmass(lbm)recdingdensityinlbmft3shallnotberegardedasnonconfmancewiththisstard.1.8.4Thetermsdensityunitweightareoftenusedinterc

17、hangeably.Densityismassperunitvolumewhereasunitweightisfceperunitvolume.Inthisstarddensityis1ThistestmethodisunderthejurisdictionofASTMCommitteeD18onSoilRockisthedirectresponsibilityofSubcommitteeD18.05onStrengthCompress

18、ibilityofSoils.CurrenteditionapprovedDec.12014.PublishedJanuary2015.iginallyapprovedin1961.Lastpreviouseditionapprovedin2007asD1883–07?2.DOI:10.1520D188314.ASummaryofChangessectionappearsattheendofthisstardCopyright?ASTM

19、International100BarrHarbDrivePOBoxC700WestConshohockenPA194282959.UnitedStates1airfieldpavements.TheCBRvalueobtainedinthistestfmsanintegralpartofseveralflexiblepavementdesignmethods.5.2Fapplicationswheretheeffectofcompac

20、tionwatercontentonCBRissmallsuchascohesionlesscoarsegrainedmaterialswhereanallowanceismadeftheeffectofdifferingcompactionwatercontentsinthedesignproceduretheCBRmaybedeterminedattheoptimumwatercontentofaspecifiedcompactio

21、nefft.Thespecifieddryunitweightisnmallytheminimumpercentcompactionallowedbytheusingclient’sfieldcompactionspecification.5.3FapplicationswheretheeffectofcompactionwatercontentonCBRisunknownwhereitisdesiredtoaccountfitseff

22、ecttheCBRisdeterminedfarangeofwatercontentsusuallytherangeofwatercontentpermittedffieldcompactionbyusingtheclient’sprotocolspecificationffieldcompaction.5.4Thecriteriaftestspecimenpreparationofselfcementing(other)materia

23、lswhichgainstrengthwithtimemustbebasedonageotechnicalengineeringevaluation.Asdirectedbytheclientselfcementingmaterialsshallbeproperlycureduntilbearingratiosrepresentinglongtermserviceconditionscanbemeasured.NOTE1—Thequal

24、ityoftheresultsproducedbythisstardisdependentonthecompetenceofthepersonnelperfmingitthesuitabilityoftheequipmentfacilitiesused.AgenciesthatmeetthecriteriaofPracticeD3740aregenerallyconsideredcapableofcompetentobjectivete

25、stingsamplinginspectionetc.UsersofthisstardarecautionedthatcompliancewithPracticeD3740doesnotinitselfensurereliableresults.ReliableresultsdependonmanyfactsPracticeD3740providesameansofevaluatingsomeofthosefacts.6.Apparat

26、us6.1LoadingMachine—Theloadingmachineshallbeequippedwithamovableheadbasethattravelsataunifm(notpulsating)rateof0.05in.(1.3mm)minfuseinpushingtheperationpistonintothespecimen.Theloadrateof0.05in.(1.3mm)minshallbemaintaine

27、dwithin620%overtherangeofloadsdevelopedduringperation.TheminimumcapacityoftheloadingmachineshallbebasedontherequirementsindicatedinTable1.6.1.1Themachineshallbeequippedwithaloadindicatingdevicematchedtotheanticipatedmaxi

28、mumperationload.Theloadindicatingdeviceshallhaveaminimumaccuracyof:10lbf(44N)lessfa10000lbf(44kN)capacity5lbf(20N)lessf5000lbf(22kN)2lbf(9N)lessf2500lbf(11kN).6.2PerationMeasuringDevice—Theperationmeasuringdevice(suchasa

29、mechanicaldialindicatelectronicdisplacementtransducer)shallbecapableofreadingtothenearest0.001in.(0.025mm)providedwithappropriatemountinghardware.Themountingassemblyofthedefmationmeasuringdeviceshallbeconnectedtotheperat

30、ingpistontheedgeofthemoldprovidingaccurateperationmeasurements.Mountingthedefmationholderassemblytoastressedcomponentoftheloadframe(suchastierods)willintroduceinaccuraciesofperationmeasurements.6.3Mold—Themoldshallbearig

31、idmetalcylinderwithaninsidediameterof6.00060.026in.(152.460.66mm)aheightof7.00060.018in.(177.860.46mm).Itshallbeprovidedwithametalextensioncollaratleast2.0in.(50.8mm)inheightametalbaseplatehavingatleasttwentyeight1?16in.

32、(1.59mm)diameterholesunifmlyspacedovertheplatewithintheinsidecircumferenceofthemold.Whenassembledwiththespacerdiscplacedinthebottomofthemoldthemoldshallhaveaninternalvolume(excludingextensioncollar)of0.075060.0009ft3(212

33、4625cm3).AmoldassemblyhavingtheminimumrequiredfeaturesisshowninFig.1.Acalibrationprocedureshallbeusedtoconfirmtheactualvolumeofthemoldwiththespacerdisked.SuitablecalibrationproceduresarecontainedinTestMethodsD698D1557.6.

34、4SpacerDisk—Acircularmetalspacerdisc(seeFig.1)havingaminimumoutsidediameterof515?16in.(150.8mm)butnogreaterthanwillallowthespacerdisctoeasilyslipintothemold.Thespacerdiscshallbe2.41660.005in.(61.3760.13mm)inheight.6.5Ram

35、mer—ArammerasspecifiedineitherTestMethodsD698D1557exceptthatifamechanicalrammerisuseditmustbeequippedwithacircularfootwhensoequippedmustprovideameansfdistributingtherammerblowsunifmlyoverthesurfaceofthesoilwhencompacting

36、ina6.000in.(152.4mm)diametermold.ThemechanicalrammermustbecalibratedadjustedinaccdancewithTestMethodsD2168.6.6ExpansionMeasuringApparatus—AnadjustablemetalstemperfatedmetalplatesimilarinconfigurationtothatshowninFig.1.Th

37、eperfatedplateshallbe57?8to515?16in.(149.2to150.8mm)indiameterhaveatleastftytwo1?16in.(1.59mm)diameterholesunifmlyspacedovertheplate.Ametaltripodtosupptthedialgaugefmeasuringtheamountofswellduringsoakingisalsorequired.Th

38、eexpansionmeasuringapparatusshallnotweighmethan2.8lbfamassof1.3kg.6.6.1SwellMeasurementDevice—Generallymechanicaldialindicatscapableofreadingto0.001in.(0.025mm)witharangeof0.200in.(5mm)minimum.6.7SurgeWeights—These“weigh

39、ts”areactually“masses”convertedtoafce.Onetwoannularmetalweightshavingatotalweightof10lbf(4.5460.02kg)slottedmetalweightseachhavingaweightof5lbf(2.2760.02kg).Theannularweightshallbe57?8to515?16in.(149.2to150.8mm)indiamete

40、rshallhaveacenterholeofapproximately21?8in.(53.98mm).6.8PerationPiston—Ametalpiston1.95460.005in.(49.6360.13mm)indiameternotlessthan4in.(101.6mm)long(seeFig.1).6.9Balance—AclassGP5balancemeetingtherequirementsofSpecifica

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