Designation:D6473−15StandardTestMethodForSpecificGravityAndAbsorptionofRockForErosionControl1ThisstandardisissuedunderthefixeddesignationD6473;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thistestmethodcoversthedeterminationofspecificgravityandabsorptionofrockforerosioncontrol,commonlyreferredtoasripraporarmorstone.Thespecificgravitymaybeexpressedasbulkspecificgravityorapparentspecificgravity.Bulkspecificgravityandabsorptionarebasedona2464-hsoakingtimefortherockspecimenstested.Thistestisappropriateforbreakwaterstone,armorstone,riprap,andgabionsizedrockmaterials.1.2Theuseofreclaimedconcreteandothermaterialsisbeyondthescopeofthistestmethod.1.3Units—ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesgiveninparenthesesaremathemati-calconversionstoinch-poundunitsthatareprovidedforinformationonlyandarenotconsideredstandard.1.4AllobservedandcalculatedvaluesshallconformtotheguidelinesforsignificantdigitsandroundingestablishedinPracticeD6026,unlesssupersededbythisstandard.1.4.1Forpurposesofcomparingmeasuredorcalculatedvalue(s)withspecifiedlimits,themeasuredorcalculatedvalue(s)shallberoundedtothenearestdecimalorsignificantdigitsinthespecifiedlimits.1.4.2Theproceduresusedtospecifyhowdataarecollected/recordedorcalculated,inthisstandardareregardedastheindustrystandard.Inaddition,theyarerepresentativeofthesignificantdigitsthatgenerallyshouldberetained.Theproce-duresuseddonotconsidermaterialvariation,purposeforobtainingthedata,specialpurposestudies,oranyconsider-ationsfortheuser’sobjectives;anditiscommonpracticetoincreaseorreducesignificantdigitsofreporteddatatobecommensuratewiththeseconsiderations.Itisbeyondthescopeofthisstandardtoconsidersignificantdigitsusedinanalyticalmethodsforengineeringdesign.1.5Thisstandarddoesnotpurporttoaddressallofthe...
