Designation:C865−13StandardPracticeforFiringRefractoryConcreteSpecimens1ThisstandardisissuedunderthefixeddesignationC865;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheDepartmentofDefense.1.Scope1.1Thispracticecoversthefiringofspecimensmadefromrefractoryconcretes(castablerefractories)inaccordancewithPracticeC862forcastspecimens.Theprocedureisalsorecommendedforheatingratestobeusedforhigh-temperaturetestmethodssuchasMethodsC16,C583,etc.,whenthesemethodsareusedtotestrefractoryconcretes.1.2Thevaluesstatedininch-poundunitsaretoberegardedasthestandard.Thevaluesgiveninparenthesesareforinformationonly.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2C16TestMethodforLoadTestingRefractoryShapesatHighTemperaturesC583TestMethodforModulusofRuptureofRefractoryMaterialsatElevatedTemperaturesC862PracticeforPreparingRefractoryConcreteSpecimensbyCastingE230SpecificationandTemperature-ElectromotiveForce(EMF)TablesforStandardizedThermocouples3.SignificanceandUse3.1ThispracticeisusedtostandardizethefiringconditionsofrefractoryconcretespecimenspreparedinaccordancewithPracticeC862.Thestandardsaresetdowntominimizelaboratory-to-laboratoryvariationanddonotattempttodupli-cateanyparticularfieldapplications.4.Apparatus4.1Kiln,equippedwithinstrumentscapableofcontrollingtheheatingrateofthekilnat100to700°F(55to380°C)/h(see6.5)andholdingthesoaktemperatureto610°F(5.5°C)ofthenominalsoaktemperature.Fortemperaturesupto2500°F(1370°C)anelectricallyheatedkilnispreferred,butgas-oroil-firedkilnscanbeusedforalltempera...
