ASTM_C_401_-_12.pdf

Designation:C40112Standard Classification ofAlumina and Alumina-Silicate Castable Refractories1This standard is issued under the fixed designation C401;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the Department of Defense.1.Scope1.1 This classification covers alumina and alumina-silicatecastable refractories that,when tempered with water,willdevelop structural strength by chemical action.1.2 This standard does not purport to address the safetyconcerns,if any,associated with its use.It is the responsibilityof the user of this standard to establish appropriate safety andhealth practices and determine the applicability of regulatorylimitations prior to use.2.Referenced Documents2.1 ASTM Standards:2C113 Test Method for Reheat Change of Refractory BrickC133 Test Methods for Cold Crushing Strength and Modu-lus of Rupture of RefractoriesC134 Test Methods for Size,Dimensional Measurements,and Bulk Density of Refractory Brick and InsulatingFirebrickC862 Practice for Preparing Refractory Concrete Specimensby CastingC865 Practice for Firing Refractory Concrete Specimens3.Significance and Use3.1 Alumina and alumina-silicate castable refractories areproduced to yield property characteristics commensurate withdifferent end use properties.Volume stability,modulus ofrupture,bulk density,and lime content have become usefulmeasures to distinguish various alumina and alumina-silicatecastable formulations for initial fitness for service.This clas-sification is considered useful for purchase specifications andfor quality control.4.Basis of Classification4.1 Alumina and alumina silicate castable refractories thatcontain a hydraulic setting cement and have a density of greaterthan 105 lb/ft3(1.68 g/cm3)may be classified by the lime(CaO)content as contributed by the cement.The classificationsare shown in Table 1.While this standard only uses the limecontent as contributed by cement other sources of lime may bepresent in the mix and may affect the performance of amaterial.4.2 Refractory castables classified as conventional castablerefractories having a modulus of rupture after drying of at least300 psi(2.07 MPa)are normal-strength,and those having atleast 600 psi(4.14 MPa)modulus of rupture are high-strengthtypes.They are further classified on the basis of volumestability of cast test brick when fired at the temperaturesprescribed in Table 2.4.3Insulating Refractory Castables This class includesinsulating castable refractories which are classified on the basisof bulk density of dried cast test brick and volume stability ofsuch test brick when fired at the temperatures prescribed inTable 3.5.Test Methods5.1 The properties enumerated in this classification shall bedetermined in accordance with the following ASTM methods:5.1.1 Modulus of RuptureTest Methods C133 on test brickwith Practice C862,and after oven-drying in accordance withthe Curing of Test Specimens section of Practice C862.Specimens should be fired as given in heating schedule ofPractice C865.5.1.2 Permanent Linear ChangeTest Method C113 onspecimens prepared in accordance with Practice C862 and firedas given in heating schedule of Practice C865.5.1.3 Bulk DensityTest Methods C134 on test brick pre-pared and oven-dried in accordance with Practice C862 andfired as given in heating schedule of Practice C865.6.Retests6.1 Because of variables resulting from sampling and thelack of satisfactory reproducibility in tests conducted bydifferent laboratories,the material may be resampled andretested when requested by either the manufacturer or the1This classification is under the jurisdiction of ASTM Committee C08 onRefractories and is the direct responsibility of Subcommittee C08.92The Joseph E.Kopanda Subcommittee for Editorial,Terminology and Classification.Current edition approved March 1,2012.Published April 2012.Originallyapproved in 1957.Last previous edition approved in 2005 as C401 91(2005).DOI:10.1520/C0401-12.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 purchaser.This may apply in instances when the first testresults do not conform to the requirements prescribed in thisclassification.The final results to be used shall be the averageof at least two sets of results,each of which has been obtainedby following in detail the specified testing procedures.7.Keywords7.1 alumina;alumina-silicate;castable refractories;insulat-ing castable refractories;low-cement castable refractories;no-cem