Designation:D2166/D2166M−13StandardTestMethodforUnconfinedCompressiveStrengthofCohesiveSoil1ThisstandardisissuedunderthefixeddesignationD2166/D2166M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thistestmethodcoversthedeterminationoftheuncon-finedcompressivestrengthofcohesivesoilintheintact,remolded,orreconstitutedcondition,usingstrain-controlledapplicationoftheaxialload.1.2Thistestmethodprovidesanapproximatevalueofthestrengthofcohesivesoilsintermsoftotalstresses.1.3Thistestmethodisapplicableonlytocohesivematerialswhichwillnotexpelorbleedwater(waterexpelledfromthesoilduetodeformationorcompaction)duringtheloadingportionofthetestandwhichwillretainintrinsicstrengthafterremovalofconfiningpressures,suchasclaysorcementedsoils.Dryandcrumblysoils,fissuredorvarvedmaterials,silts,peats,andsandscannotbetestedwiththismethodtoobtainvalidunconfinedcompressionstrengthvalues.NOTE1—Thedeterminationoftheunconsolidated,undrainedstrengthofcohesivesoilswithlateralconfinementiscoveredbyTestMethodD2850.1.4ThistestmethodisnotasubstituteforTestMethodD2850.1.5AllobservedandcalculatedvaluesshallconformtotheguidelinesforsignificantdigitsandroundingestablishedinPracticeD6026,unlesssupersededbythisstandard.1.5.1Theproceduresusedtospecifyhowdataarecollected/recordedandcalculatedinthistestmethodareregardedastheindustrystandard.Inaddition,theyarerepresentativeofthesignificantdigitsthatshouldgenerallyberetained.Theproce-duresuseddonotconsidermaterialvariation,purposeforobtainingthedata,specialpurposestudies,oranyconsider-ationsfortheuser’sobjectives;anditiscommonpracticetoincreaseorreducesignificantdigitsofreporteddatatocom-mensuratewiththeseconsiderations.Itisbeyondthescopeofthistestmethodtoconsidersignificantdigitsusedinanalysismethodsforengineeringdesign.1.6Thevaluesstated...
