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1、Designation:D6780D6780M?12StardTestMethodfWaterContentDensityofSoilInsitubyTimeDomainReflectometry(TDR)1ThisstardisissuedunderthefixeddesignationD6780D6780Mthenumberimmediatelyfollowingthedesignationindicatestheyearofigi

2、naladoptioninthecaseofrevisiontheyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperepsilon()indicatesaneditialchangesincethelastrevisionreapproval.1.Scope1.1Thistestmethodmaybeusedtodeterminet

3、hewatercontentofsoilstheinsitudensityofsoilsusingaTDRapparatus.1.2Thistestmethodappliestosoilsthathave30%lessbyweightoftheirparticlesretainedonthe19.0mm[3?4in.]sieve.1.3Thistestmethodissuitablefuseasameansofacceptancefco

4、mpactedfillembankments.1.4Thistestmethodmaynotbesuitablefganichighlyplasticsoils.1.5AllobservedcalculatedvaluesshallconfmtotheguidelinesfsignificantdigitsroundingestablishedinPracticeD6026.1.5.1Themethodusedtospecifyhowd

5、ataarecollectedcalculatedrecdedinthisstardisnotdirectlyrelatedtotheaccuracytowhichthedatacanbeappliedindesignotherusesboth.Howoneappliestheresultsobtainedusingthisstardisbeyonditsscope.1.6Twoalternativeproceduresareprovi

6、ded.1.6.1ProcedureAinvolvestwotestsinthefieldaninsitutestatestinamoldcontainingmaterialexcavatedfromtheinsitutestlocation.Theapparentdielectricconstantisdeterminedinbothtests.1.6.2ProcedureBinvolvesonlyaninsitutestbyincp

7、oratingthefirstvoltagelongtermvoltage(V1Vf)inadditiontotheapparentdielectricconstant.Whilethebulkelectricalconductivitycanbedeterminedfromthesemeasurementsitisnotneededfthedeterminationofwatercontentdensity.1.7Thevaluess

8、tatedineitherSIunitsinchpoundunitsaretoberegardedseparatelyasstard.Thevaluesstatedineachsystemmaynotbeexactequivalentstherefeeachsystemshallbeusedindependentlyoftheother.Combiningvaluesfromthetwosystemsmayresultinnonconf

9、mancewiththestard.FadditionalinfmationconsultSI10.1.8Thisstarddoesnotpurpttoaddressallofthesafetyconcernsifanyassociatedwithitsuse.Itistheresponsibilityoftheuserofthisstardtoestablishappropriatesafetyhealthpracticesdeter

10、minetheapplicabilityofregulatylimitationspritouse.2.ReferencedDocuments2.1ASTMStards:2D653TerminologyRelatingtoSoilRockContainedFluidsD698TestMethodsfLabatyCompactionacteristicsofSoilUsingStardEfft(12400ftlbfft3(600kNmm3

11、))D2216TestMethodsfLabatyDeterminationofWater(Moisture)ContentofSoilRockbyMassD3740PracticefMinimumRequirementsfAgenciesEngagedinTestingInspectionofSoilRockasUsedinEngineeringDesignConstructionD4753GuidefEvaluatingingSpe

12、cifyingBalancesStardMassesfUseinSoilRockConstructionMaterialsTestingD6026PracticefUsingSignificantDigitsinGeotechnicalDataD6565TestMethodfDeterminationofWater(Moisture)ContentofSoilbytheTimeDomainReflectometry(TDR)Method

13、(Withdrawn2014)3E1SpecificationfASTMLiquidinGlassThermometersSI10StardfUseoftheInternationalSystemofUnits(SI):TheModernMetricSystem3.Terminology3.1Definitions—RefertoTerminologyD653fstarddefinitionsofterms.1Thistestmetho

14、disunderthejurisdictionofASTMCommitteeD18onSoilRockisthedirectresponsibilityofSubcommitteeD18.08onSpecialConstructionControlTests.CurrenteditionapprovedMay152012.PublishedAugust2012.iginallyapprovedin2002.Lastpreviousedi

15、tionapprovedin2005asD6780–05.DOI:10.1520D6780_D6780M12.2FreferencedASTMstardsvisittheASTMwebsitewww.astm.gcontactASTMCustomerServiceat.FAnnualBookofASTMStardsvolumeinfmationrefertothestard’sDocumentSummarypageontheASTMwe

16、bsite.3Thelastapprovedversionofthishisticalstardisreferencedonwww.astm.g.ASummaryofChangessectionappearsattheendofthisstardCopyright?ASTMInternational100BarrHarbDrivePOBoxC700WestConshohockenPA194282959.UnitedStates14.Su

17、mmaryofTestMethod4.1ProcedureA5—Thedielectricconstantofthesoilinsituisdeterminedusingamultiplerodprobe(MRP)acoaxialhead(CH)TDRapparatus.Thesoilatthelocationoftheinsitumeasurementisthenexcavatedcompactedinamold.Bymeasurem

18、entofthemassofthemoldsoilwiththemassvolumeofthemoldknownthewetdensityofthesoilinthemoldisdetermined.Aroddrivenintothesoilalongtheaxisofthemoldcreatesacylindricalmoldprobe(CMP).Usingthesamecoaxialhead(CH)anadapterringtheT

19、DRapparatusthedielectricconstantofthesoilinthemoldismeasured.Thewatercontentofthesoilinthemoldisdeterminedusingacrelationbetweenthedielectricconstantmoisturecontentsoildensity.Thecrelationrequirestwoconstantsthataresomew

20、hatsoilspecific.Itisassumedthatthewatercontentofthesoilinsituisthesameasthewatercontentinthemold.Thedensityofthesoilinsituisdeterminedfromthedensityofthesoilinthemoldthedielectricconstantsmeasuredinthemoldinsitu.4.2Proce

21、dureB5—Theapparentdielectricconstantofthesoilinsitufirstvoltagelongtermvoltage(V1Vf)aredeterminedusingamultiplerodprobe(MRP)acoaxialhead(CH)TDRapparatus.Thewatercontentdensityofthesoilinsituaredeterminedfromthemeasuredap

22、parentdielectricconstantV1Vffiveconstants.Thefivesoilconstantsaresoilinsitupefluiddependent.ThefivesoilconstantsaredeterminedinconjunctionwithlabatycompactionproceduresusingspecifiedcompactionproceduresfexampleTestMethod

23、D698bytakingmeasurementsoftheapparentdielectricconstantV1Vffeachcompactionpoint.5.SignificanceUse5.1Thistestmethodcanbeusedtodeterminethedensitywatercontentofnaturallyoccurringsoilsofsoilsplacedduringtheconstructionofear

24、thembankmentsroadfillsstructuralbackfills.5.2Timedomainreflectometry(TDR)measurestheapparentdielectricconstant(ProcedureA)theapparentdielectricconstantfirstvoltagelongtermvoltage(V1Vf)(ProcedureB)ofsoil.Theapparentdielec

25、tricconstantisaffectedsignificantlybythewatercontentdensityofsoiltoalesserextentbythechemicalcompositionofsoilpewaterbytemperature.Thefirstvoltagelongtermvoltage(V1Vf)areaffectedsignificantlybythewatercontentdensitythech

26、emicalcompositionoftheinsitupewatertoalesserextentthechemicalcompositionofthesoilsolids.ThistestmethodmeasuresthegravimetricwatercontentmakesuseofadifferentrelationshipbetweentheelectricalpropertieswatercontentfromTestMe

27、thodD6565whichmeasuresthevolumetricwatercontent.5.3SoilpewateracteristicsareaccountedfinProcedureAwithtwocalibrationconstantsfProcedureBwithfivecalibrationconstants.ThetwosoilconstantsfProcedureAaredeterminedfagivensoilb

28、yperfmingcompactiontestsinaspecialmoldasdescribedinAnnexA2.ThefivesoilconstantsfProcedureBaredeterminedinconjunctionwithcompactiontestinginaccdancewithspecifiedcompactionproceduresfexampleTestMethodD698asdescribedinAnnex

29、A3.BothProceduresABuseTestMethodD2216todeterminethewatercontents.5.4WhenfollowingProcedureAthewatercontentistheaveragevalueoverthelengthofthecylindricalmoldthedensityistheaveragevalueoverthelengthofthemultiplerodprobeemb

30、eddedinthesoil.WhenfollowingProcedureBthewatercontentdensityistheaveragevaluesoverthelengthofthemultiplerodembeddedinthesoil.NOTE1—Thequalityoftheresultproducedbythisstardisdependentonthecompetenceofthepersonnelperfmingi

31、tthesuitabilityoftheequipmentfacilitiesused.AgenciesthatmeetthecriteriaofPracticeD3740aregenerallyconsideredcapableofcompetentobjectivetestingsamplinginspectionetc.UsersofthisstardarecautionedthatcompliancewithPracticeD3

32、740doesnotinitselfassurereliableresults.ReliableresultsdependonmanyfactsPracticeD3740providesameansofevaluatingsomeofthosefacts.6.Interferences6.1Qualityaccuracyofthetestresultssignificantlydependonsoilhavingcontactwitht

33、heinnerconductoftheprobes.ToassistthiswheninstallingtherodsoftheMRPtherodthatfmstheinnerconductmustbethelastrodinstalled.Ifintheinstallationprocesstherodhitsuponalargeparticlethatcausesittodriftfromverticalalignmentallro

34、dsshouldberemovedthetestconductedinanewlocationatleast0.2m[8in.]fromtheprevioustestlocation.6.2ThequalityofthesignalreadbytheTDRapparatusdependsonhavingcleancontactsbetweentheCHtheMRPtheCMP.Thecontactingsurfacesshouldbew

35、ipedwithacleanclothpritoplacingtheCHontheMRPtheCMP.OnceplacedobservethesignalontheTDRapparatus.IftheacteristicsignalisnotpresenttheCHmayhavetobeslightlyrotatedaboutitsaxistomakebettercontact.6.3Thistestmethodonlyappliest

36、ononfrozensoil.Theapparentdielectricconstantisslightlytemperaturedependentfsoilsdependsonsoiltype.Fsoiltemperaturesbetween15C25C[59F77F]notemperaturecrectionsareneededfmostsoils.Asimpletemperatureadjustmentfwatercontentd

37、eterminationispartofthetestmethod.7.Apparatus7.1TDRApparatusaMetallicTimeDomainReflectometerwithascaledlengthresolutionofatleast2.4mm[0.10in.](thiscrespondsapproximatelytoatimebetweendatapointslessthanequaltosixteenpicos

38、econds(161012s).AptablecomputerwithacommunicationpttotheTDRissuggestedfcontrollingtheapparatusacquiringsavingthedatafmakingthecalculationsasthetestproceeds.7.2MultipleRodProbe(MRP)4withCoaxialHead(CH)35Theapparatusproced

39、uresarecoveredbypatentspendingpatents.Interestedpartiesareinvitedtosubmitinfmationregardingtheidentificationofalternative(s)tothesepatenteditemstotheASTMHeadquarters.Yourcommentswillreceivecarefulconsiderationatameetingo

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