Designation:D5334−22StandardTestMethodforDeterminationofThermalConductivityofSoilandRockbyThermalNeedleProbeProcedure1ThisstandardisissuedunderthefixeddesignationD5334;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thistestmethodpresentsaprocedurefordeterminingthethermalconductivity(λ)ofsoilandrockusingatransientheatmethod.Thistestmethodisapplicableforbothintactspecimensofsoilandrockandreconstitutedsoilspecimens,andiseffectiveinthelabandinthefield.Thistestmethodismostsuitableforhomogeneousmaterials,butcanalsogivearepresentativeaveragevaluefornon-homogeneousmaterials.1.2Thistestmethodisapplicabletodry,unsaturatedorsaturatedmaterialsthatcansustainaholeforthesensor.Itisvalidovertemperaturesrangingfrom<0to>100°C,dependingonthesuitabilityofthethermalneedleprobeconstructiontotemperatureextremes.However,caremustbetakentopreventsignificanterrorfrom:(1)redistributionofwaterduetothermalgradientsresultingfromheatingoftheneedleprobe;(2)redistributionofwaterduetohydraulicgradients(gravitydrainageforhighdegreesofsaturationorsurfaceevaporation);(3)phasechangeofwaterinspecimenswithtemperaturesnear0°Cor100°C.1.3Units—ThevaluesstatedinSIunitsaretoberegardedasthestandard.Nootherunitsofmeasurementsareincludedinthisstandard.ReportingoftestresultsinunitsotherthanSIshallnotberegardedasnonconformancewiththisstandard.1.4AllobservedandcalculatedvaluesshallconformtotheguidelinesforsignificantdigitsandroundingestablishedinPracticeD6026.1.4.1Theproceduresusedtospecifyhowdataarecollected/recordedorcalculatedinthisstandardareregardedastheindustrystandard.Inaddition,theyarerepresentativeofthesignificantdigitsthatgenerallyshouldberetained.Theproce-duresuseddonotconsidermaterialvariation,purposeforobtainingthedata,specialpurposestudies,oranyconsider-ationsfortheuser’sobjec...
