Designation:D5550−14StandardTestMethodforSpecificGravityofSoilSolidsbyGasPycnometer1ThisstandardisissuedunderthefixeddesignationD5550;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thistestmethodcoversthedeterminationofthespecificgravityofsoilsolidsbymeansofagaspycnometer.Particlesizeislimitedbythedimensionsofthespecimencontaineroftheparticularpycnometerbeingused.1.2TestMethodD854maybeusedinsteadoforinconjunctionwiththistestmethodforperformingspecificgravitytestsonsoils.NotethatTestMethodD854doesnotrequirethespecializedtestapparatusneededbythistestmethod.However,TestMethodD854maynotbeusedifthespecimencontainsmatterthatcanreadilydissolveinwater,whereasthistestmethoddoesnothavethatlimitation.1.3AllmeasuredandcalculatedvaluesshallconformtotheguidelinesforsignificantdigitsandroundingestablishedinPracticeD6026.1.3.1Forpurposesofcomparingameasuredorcalculatedvalue(s)withspecifiedlimits,themeasuredorcalculatedvalue(s)shallberoundedtothenearestdecimalorsignificantdigitsinthespecifiedlimits.1.3.2Theproceduresusedtospecifyhowdataarecollected/recordedandcalculatedinthisstandardareregardedastheindustrystandard.Inaddition,theyarerepresentativeofthesignificantdigitsthatshouldgenerallyberetained.Theproce-duresuseddonotconsidermaterialvariation,purposeforobtainingthedata,specialpurposestudies,oranyconsider-ationsfortheuser’sobjectives;anditiscommonpracticetoincreaseorreducesignificantdigitsofreporteddatatobecommensuratewiththeseconsiderations.Itisbeyondthescopeofthisstandardtoconsidersignificantdigitsusedinanalysismethodsforengineeringdesign.1.4Units—ThevaluesstatedinSIunitsaretoberegardedasstandard.Thevaluesgiveninparenthesesaremathematicalconversionstoinch-poundunits,whichareprovidedforinformationonlyandarenotconsideredstandard.1.4.1Theconvertedinch-poundun...
