Designation:C133−97(Reapproved2015)StandardTestMethodsforColdCrushingStrengthandModulusofRuptureofRefractories1ThisstandardisissuedunderthefixeddesignationC133;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope1.1Thesetestmethodscoverthedeterminationofthecoldcrushingstrengthandthemodulusofrupture(MOR)ofdriedorfiredrefractoryshapesofalltypes.1.2Thetestmethodsappearinthefollowingsections:TestMethodSectionsColdCrushingStrength4to9ModulusofRupture10to151.3Thevaluesstatedininch-poundunitsaretoberegardedasstandard.ThevaluesgiveninparenthesesaremathematicalconversionstoSIunitsthatareprovidedforinformationonlyandarenotconsideredstandard.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2C862PracticeforPreparingRefractoryConcreteSpecimensbyCastingC1054PracticeforPressingandDryingRefractoryPlasticandRammingMixSpecimensE4PracticesforForceVerificationofTestingMachines3.SignificanceandUse3.1Thecoldstrengthofarefractorymaterialisanindica-tionofitssuitabilityforuseinrefractoryconstruction.(Itisnotameasureofperformanceatelevatedtemperatures.)3.2Thesetestmethodsarefordeterminingtheroomtem-peratureflexuralstrengthin3-pointbending(coldmodulusofrupture)orcompressivestrength(coldcrushingstrength),orboth,forallrefractoryproducts.3.3Considerablecaremustbeusedtocomparetheresultsofdifferentdeterminationsofthecoldcrushingstrengthormodulusofrupture.Thespecimensizeandshape,thenatureofthespecimenfaces(thatis,as-formed,sawed,orground),theorientationofthosefacesduringtesting,theloadingg...
