ASTM_C_417_-_05_2015.pdf

Designation:C41705(Reapproved 2015)Standard Test Method forThermal Conductivity of Unfired Monolithic Refractories1This standard is issued under the fixed designation C417;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.1.Scope1.1 This test method supplements Test Method C201,andshall be used in conjunction with that test method for deter-mining the thermal conductivity of unfired monolithic refrac-tories.1.2 The values stated in inch-pound units are to be regardedas standard.The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.1.3 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2C182 Test Method for Thermal Conductivity of InsulatingFirebrickC201 Test Method for Thermal Conductivity of RefractoriesC862 Practice for Preparing Refractory Concrete Specimensby CastingC1054 Practice for Pressing and Drying Refractory Plasticand Ramming Mix SpecimensE220 Test Method for Calibration of Thermocouples ByComparison Techniques3.Significance and Use3.1 The thermal conductivity of monolithic refractories is aproperty required for selecting their thermal transmissioncharacteristics.Users select monolithic refractories to providespecified conditions of heat loss and cold face temperature,without exceeding the temperature limitation of the monolithicrefractory.This test method establishes placement of thermo-couples and positioning of test specimens in the calorimeter.3.2 This procedure must be used with Test Method C201and requires a large thermal gradient and steady state condi-tions.The results are based upon a mean temperature.3.3 The data from this test method are suitable for specifi-cationacceptance,estimatingheatlossandsurfacetemperature,and the design of multi-layer refractory construc-tion.3.4 The use of these data requires consideration of the actualapplication environment and conditions.4.Apparatus4.1 The apparatus shall be in accordance with Test MethodC201,modified as in 4.2 of this test method,with the additionof thermocouples and refractory fiber paper,as described inSections 6 and 7.4.2 The furnace shall be modified by drilling a nominal38-in.(10-mm)diameter hole(Fig.1)through the insulatingfirebrick in the furnace wall at each end of the center line of the18-in.(456-mm)dimension of the furnace cavity.These holesshall be positioned so that the length of the hole will be parallelto the calorimeter surface and the bottom of the hole willcoincide with the surface of the calorimeter.Copper tubingshall be placed within each hole so that a compressed-airsource can be attached to one side and flexible leads to aflowmeter can be attached to the other.4.3 A compressed-air supply and flowmeter for air.5.Test Specimens5.1 Castable RefractoriesThe test specimens may consistof either a panel 18 by 1312by 212in.(456 by 342 by 64 mm),or an assembly of three straights 9 by 412by 212in.(228 by114 by 64 mm)and six soaps 9 by 214by 212in.(228 by 57by 64 mm).These specimens shall be prepared as in one of thefollowing methods and in general accordance with the manu-facturers recommendation for water content and PracticeC862.5.1.1 Panel SpecimensThis test specimen shall be amonolithic panel 18 by 1312by 212in.(456 by 342 by 64 mm)in size,and shall be prepared in general accordance withPractice C862,as outlined in 5.1.The panel shall be cast in a1This test method is under the jurisdiction of ASTM Committee C08 onRefractoriesand is the direct responsibility of Subcommittee C08.02 on ThermalProperties.Current edition approved Oct.1,2015.Published October 2015.Originallyapproved in 1958.Last previous edition approved in 2010 as C417 05(2010)1.DOI:10.1520/C0417-05R15.2For 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 steel mold with two steel rods(Note 1)taped in place at thecenter line of the 18-in.(456-mm)length of the mold cavity.These steel rods form the slot required so that the panel will fitover the tubing used for the entrance and exhaust of air andmoisture from the furnace(see Fig.1).NOTE1Two12-in.(13-mm)diameter steel rods 2 in.(51 mm)longshould have approximately132in.(0.8 mm)removed longitudinally toprovide a flat base.5.1.2 Straight Speci