Designation:C637−14StandardSpecificationforAggregatesforRadiation-ShieldingConcrete1ThisstandardisissuedunderthefixeddesignationC637;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thisspecificationcoversspecialaggregatesforuseinradiation-shieldingconcretesinwhichcompositionorhighspecificgravity,orboth,areofprimeconsideration.1.2ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.3Thefollowingprecautionarycaveatpertainsonlytothetestmethodportion,Section9,ofthisspecification:Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimita-tionspriortouse.2.ReferencedDocuments2.1ASTMStandards:2C33SpecificationforConcreteAggregatesC125TerminologyRelatingtoConcreteandConcreteAg-gregatesC127TestMethodforDensity,RelativeDensity(SpecificGravity),andAbsorptionofCoarseAggregateC128TestMethodforDensity,RelativeDensity(SpecificGravity),andAbsorptionofFineAggregateC131TestMethodforResistancetoDegradationofSmall-SizeCoarseAggregatebyAbrasionandImpactintheLosAngelesMachineC136TestMethodforSieveAnalysisofFineandCoarseAggregatesC219TerminologyRelatingtoHydraulicCementC535TestMethodforResistancetoDegradationofLarge-SizeCoarseAggregatebyAbrasionandImpactintheLosAngelesMachineC638DescriptiveNomenclatureofConstituentsofAggre-gatesforRadiation-ShieldingConcrete3.Terminology3.1Definitions:3.1.1Fordefinitionsoftermsusedinthisstandard,refertoTerminologiesC125andC219.4.Classification4.1Aggregatescoveredbythisspecificationinclude:4.1.1Naturalmineralaggregatesofeitherhighdensityorhighfixedwatercontent,orboth.Theseincludeaggregatesthatcontainorconsistpredominatelyofmate...
