Designation:D2216−10StandardTestMethodsforLaboratoryDeterminationofWater(Moisture)ContentofSoilandRockbyMass1ThisstandardisissuedunderthefixeddesignationD2216;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheDepartmentofDefense.1.Scope*1.1Thesetestmethodscoverthelaboratorydeterminationofthewater(moisture)contentbymassofsoil,rock,andsimilarmaterialswherethereductioninmassbydryingisduetolossofwaterexceptasnotedin1.4,1.5,and1.7.Forsimplicity,theword“material”shallrefertosoil,rockoraggregatewhicheverismostapplicable.1.2Somedisciplines,suchassoilscience,needtodeter-minewatercontentonthebasisofvolume.Suchdetermina-tionsarebeyondthescopeofthistestmethod.1.3Thewatercontentofamaterialisdefinedin3.2.1.1.4Theterm“solidmaterial”asusedingeotechnicalengineeringistypicallyassumedtomeannaturallyoccurringmineralparticlesofsoilandrockthatarenotreadilysolubleinwater.Therefore,thewatercontentofmaterialscontainingextraneousmatter(suchascementetc.)mayrequirespecialtreatmentoraqualifieddefinitionofwatercontent.Inaddition,someorganicmaterialsmaybedecomposedbyovendryingatthestandarddryingtemperatureforthismethod(110°C).Materialscontaininggypsum(calciumsulfatedihydrate)orothercompoundshavingsignificantamountsofhydratedwatermaypresentaspecialproblemasthismaterialslowlydehy-dratesatthestandarddryingtemperature(110°C)andatverylowrelativehumidity,formingacompound(suchascalciumsulfatehemihydrate)thatisnotnormallypresentinnaturalmaterialsexceptinsomedesertsoils.Inordertoreducethedegreeofdehydrationofgypsuminthosematerialscontaininggypsumortoreducedecompositioninhighly/fibrousorganicsoils,itmaybedesirabletodrythematerialsat60°Corinadesiccatoratroomtemperature.Thus,whenadryingtempera-tureisusedwhichisdifferentfromthestandarddryingtempera...
