ASTM_C_1113_-_C_1113M_-_09_2013.pdf

Designation:C1113/C1113M09(Reapproved 2013)Standard Test Method forThermal Conductivity of Refractories by Hot Wire(PlatinumResistance Thermometer Technique)1This standard is issued under the fixed designation C1113/C1113M;the number immediately following the designation indicates the yearof original adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.A superscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method covers the determination of thermalconductivity of non-carbonacious,dielectric refractories.1.2 Applicable refractories include refractory brick,refrac-tory castables,plastic refractories,ramming mixes,powderedmaterials,granular materials,and refractory fibers.1.3 Thermal conductivity k-values can be determined fromroom temperature to 1500C 2732F,or the maximumservice limit of the refractory,or to the temperature at whichthe refractory is no longer dielectric.1.4 This test method is applicable to refractories withk-values less than 15 W/mK 100 Btuin./hft2F.1.5 In general it is difficult to make accurate measurementsof anisotropic materials,particularly those containing fibers,and the use of this test method for such materials should beagreed between the parties concerned.1.6 UnitsThe values stated in either SI units or inch-pound units are to be regarded separately as standard.Thevalues stated in each system may not be exact equivalents;therefore,each system shall be used independently of the other.Combining values from the two systems may result in non-conformance with the standard.1.7 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:2C134 Test Methods for Size,Dimensional Measurements,and Bulk Density of Refractory Brick and InsulatingFirebrickC201 Test Method for Thermal Conductivity of RefractoriesC865 Practice for Firing Refractory Concrete SpecimensE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test Method2.2 ISO Standard:DIS*8894-2 Refractory Materials-Determination of Ther-mal Conductivity up to 1250C of Dense and InsulatingRefractory Products According to the Hot Wire ParallelMethod33.Terminology3.1 Symbols:3.1.1 RThot wire resistance at any temperature,ohms.3.1.2 R0hot wire resistance at 0C 32F(from an icebath),ohms.3.1.3 Lhot wire length,cm.3.1.4 Tsample test temperature,C.3.1.5 Vaverage voltage drop across hot wire,volts.3.1.6 Vsaverage voltage drop across standard resistor,volts.3.1.7 Rsaverage resistance of standard resistor,ohms.3.1.8 Iaverage current through hot wire(Vs/Rs),amperes.3.1.9 Qaverage power input to hot wire(I*V*100/L)during test,watts/m.3.1.10 ttime,min.3.1.11 Bslope of linear region in RTvs.ln(t)plot.3.1.12 kthermal conductivity,W/mK.3.1.13 a,b,ccoefficients of a second degree polynomialequation relating hot wire resistance and temperature.3.1.14 V,I,and Q are preferably measured in the linearregion of the RTversus ln(t)plot for maximum data accuracy.1This test method is under the jurisdiction of ASTM Committee C08 onRefractories and is the direct responsibility of Subcommittee C08.02 on ThermalProperties.Current edition approved Sept.1,2013.Published September 2013.Originallyapproved in 1990.Last previous edition approved in 2009 as C1113/C1113M09.DOI:10.1520/C1113_C1113M-09R13.2For 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.3Available from American National Standards Institute(ANSI),25 W.43rd St.,4th Floor,New York,NY 10036,http:/www.ansi.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 4.Summary of Test Method4.1 A constant electrical current is applied to a pure plati-num wire placed between two brick.The rate at which the wireheats is dependent upon how rapidly heat flows from the wireinto the constant temperature mass of the refractory brick.Therate of temperature increase of the platinum wire is accuratelydetermined by measuring its increase in resistance in the sameway a platinum resistance thermometer is used.A Fourierequation is used to calculate the k-value based on the rate oftemperature increase of the wire and power input.45.Significance and Use5.1 The k-values determined at one or more temperaturescan be used for ranking products in relative order of theirthermal conductivities.5.2 Estimates of heat flow,interface temperatures,and coldface temperatures of single,and multi-component linings canbe calculated using k-values obtained over a wide temperaturerange.5.3 The k-values determined are“a