Designation:C1656−13StandardGuideforMeasuringtheReactivityofHydraulicRefractoryCastablesusingExothermicProfile1ThisstandardisissuedunderthefixeddesignationC1656;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thisguideappliestoallcastableswithareactivebindersystemthatproducesameasurableheatprofileduringthesettingandhardeningprocess.Themajorityofthesesystemswillhavecalciumaluminatecementasonecomponentofthebindersystem.1.2Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2C401ClassificationofAluminaandAlumina-SilicateCastableRefractoriesC71TerminologyRelatingtoRefractoriesC862PracticeforPreparingRefractoryConcreteSpecimensbyCasting3.Terminology3.1Definitions:3.1.1EP–exothermicprofile,n—thecurvegeneratedbyplottingtemperatureoftheembeddedthermocoupleversustime.3.1.2LCC,n—Lowcementcastable.4.SignificanceandUse4.1Theheatofhydrationofacalciumaluminatebasedcastableisliberatedoverashortperiodoftime(ascomparedtoPortlandcement).Thismakesiteasytomeasuretheheatprofileusingoff-the-shelfthermocoupleequipment.4.2Theheatprofilecanbeusedtomakeinferencesaboutthesettingandstrengthgainbehaviorofacastableandsometimestheworkingtimeofacastable.4.3Factorsthatshouldbecontrolledwhencomparingtwocastablesinclude:size,shapeandmassofcastobject,starttemperatureofthemix,temperatureofenvironment,andthethermalconductivityoftheenvironment.Ifthesefactorsareheldconstant,thenthetwocastablesheatprofilescanbecompared.4.4Thetemperatureincreasecreatedbythecastableexo-thermicreactionshallbeatleast2.0°Cmorethanthenormalfluctuationofthelaboratorytemperaturesothatthe...
