Designation:C456−13StandardTestMethodforHydrationResistanceofBasicBricksandShapes1ThisstandardisissuedunderthefixeddesignationC456;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversmeasurementoftherelativeresistanceofbasicbrickandshapestohydration.1.2Thevaluesstatedininch-poundunitsaretoberegardedasthestandard.Thevaluesgiveninparenthesesareforinformationonly.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyproblems,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.SignificanceandUse2.1Thistestmethodcomparesrelativeresistancetohydra-tionofbasicrefractorybrickandshapesinlaboratorytests.2.2Thistestmethodallowsanestimatetobemadeoftherelativepotentialforhydration.2.3Thetestmethodisusedinindustryandinsomecasesitisusedforspecificationpurposes.2.4Theresultsmustbecarefullyusedasameansofpredictingwhetherornotbasicbrickorshapeswillhydrateunderactualconditionsofstorageorservice.3.Apparatus3.1Autoclave,suitableforoperationat80lb/in.2(552kPa)at324°F(162°C),andequippedwithpressure-andtemperature-measuringdevices,aventcock,andsafetyequip-ment.Capacityshallbesufficienttohotupto12specimens,generally2gallons.4.TestSpecimens4.1Thetestspecimensshallbe1-in.(25-mm)cubescutfromtheinteriorofbasicrefractorybrickorshapessothatnooriginalsurfacesarepresent.Onlyonespecimenshallbecutfromeachoffivebricksorshapes.5.Procedure5.1Drythetestspecimenstoconstantweightat220to230°F(105to110°C)inaforced-airdrier.5.2Addsufficientwatertotheautoclavetomaintain80psi(552kPa)at324°F(162°C)forthedurationofeach5-htest,butnotenoughtopermitcontactwithanyofthespecimens.5.3PlaceeachspecimeninalidlessNo.2porcelaincrucible,andplacethecrucibleint...
