ASTM C583-2005 Standard Test Method for Modulus of Rupture of Refractory Materials at Elevated Temperatures《高温下耐火材料破裂模数的标准试验方法》.pdf

《ASTM C583-2005 Standard Test Method for Modulus of Rupture of Refractory Materials at Elevated Temperatures《高温下耐火材料破裂模数的标准试验方法》.pdf》由会员分享，可在线阅读，更多相关《ASTM C583-2005 Standard Test Method for Modulus of Rupture of Refractory Materials at Elevated Temperatures《高温下耐火材料破裂模数的标准试验方法》.pdf（4页珍藏版）》请在麦多课文档分享上搜索。

1、Designation: C 583 05Standard Test Method forModulus of Rupture of Refractory Materials at ElevatedTemperatures1This standard is issued under the fixed designation C 583; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of

2、last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This test method covers determination of the high-temperature modulus of rupture of refractory brick or mono-lithic r

3、efractories in an oxidizing atmosphere and under actionof a force or stress that is increased at a constant rate.1.2 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 sa

4、fety and health practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2E 220 Test Method for Calibration of Thermocouples byComparison Techniques3. Significance and Use3.1 Measuring the modulus of rupture of refractories atelevate

5、d temperatures has become a widely accepted means toevaluate materials at service temperatures. Many consumercompanies have specifications based on this type of test.3.2 This test method is limited to furnaces operating underoxidizing conditions. However, with modifications for atmo-sphere control i

6、n other test furnaces, the major criteria of thistest procedure may be employed without change.3.3 This test method is designed for progressive applicationof a force or stress on a specimen supported as a simple beamwith center-point loading. Test apparatus designed for theprogressive application of

7、 a strain may yield different results,especially since refractory materials will reach a semiplasticstate at elevated temperatures where Hookes law does notapply, that is, stress is then not proportional to strain.3.4 This test method applies to fired dense refractory brickand shapes, chemically bon

8、ded brick and shapes, shapesformed from castables, plastics, or ramming materials, and anyother refractory that can be formed to the required specimendimension.4. Apparatus4.1 Use either an electrically heated or gas-fired furnace(Note 1). A typical cross section of the furnace containing thebearing

9、 edges is shown in Fig. 1. At least one pair of lowerbearing edges, made from volume-stable refractory material(Note 2), shall be installed in the furnace on 5-in. (127-mm)centers. A thrust column, containing the top bearing edge thatis made from volume-stable refractory material, shall extendoutsid

10、e the furnace where means are provided for applying aload. The lower bearing edges and the bearing end of thesupport column shall have rounded bearing surfaces havingabout a14-in. (6-mm) radius (Note 3). The lower bearingsurfaces may be made adjustable, but must attain the standardspan of 5 6332 in.

11、 (127 6 2 mm). The length of the lowerbearing surfaces shall exceed the specimen width by about14in. The load shall be applied to the upper bearing edge by anysuitable means. Instrumentation for measuring the load shall beaccurate to 1 %. The thrust column shall be maintained invertical alignment an

12、d all bearing surfaces parallel in bothhorizontal directions.NOTE 1The test furnace can be so constructed so that a number ofspecimens may be heated and tested at the same time. Bearing edges andloading devices may be provided for a number of individual specimens,but a more practical method is to pr

13、ovide means to move individualspecimens successively onto a single set of bearing edges for breaking.The use of a separate holding furnace for specimens to be transferred intothe test furnace for breaking is also satisfactory.NOTE 2A minimum of 90 % alumina content is recommended as asuitable refrac

14、tory.NOTE 3All bearing surfaces should be checked periodically to main-tain a round surface.4.2 It is recommended that the furnace temperature becontrolled with calibrated platinum-rhodium/platinum thermo-couples connected to a program-controller recorder (see TestMethod E 220). Temperature differen

15、tial within the furnace1This test method is under the jurisdiction of ASTM Committee C08 onRefractories and is the direct responsibility of Subcommittee C08.01 on Strength.Current edition approved March 1, 2005. Published March 2005. Originallypublished as C 583 65. Last previous edition approved in

16、 2000 as C 583 00.2For 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.1Copyright ASTM International, 100 Barr Har

17、bor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.shall not be more than 620F (11C), but the controllingthermocouple shall be placed within12 in. (13 mm) of thegeometric center of a side face of the test specimen whenpositioned on the bearing edges.4.3 Furnace AtmosphereAbove a

18、 furnace temperature of1470F (800C), the furnace atmosphere shall contain aminimum of 0.5 % oxygen with 0 % combustibles. Take theatmosphere sample from the furnace chamber proper, prefer-ably as near the test specimen as possible.5. Sampling5.1 The sample shall consist of five specimens, each taken

19、from five brick or shapes or from test specimens made frommonolithic aggregate refractories.6. Test Specimen6.1 The standard test specimen shall be 1 6132 by 1 6132by approximately 6 in. (25 6 0.8 by 25 6 0.8 by approxi-mately 152 mm). Note in the report if other specimen sizes areused. Specimens cu

20、t from brick shall have at least one originalbrick surface. If cut from shapes, the specimens shall be takenparallel to the longest dimension. For irregular shapes, all fourlong surfaces of the specimen may be cut faces. Note this in thereport.6.2 Opposite faces of the specimen shall be parallel, an

21、dadjacent faces shall be perpendicular.6.3 Measure the width and depth of the test specimen atmid-span to the nearest 0.01 in. (0.3 mm).7. Procedure7.1 Set the specimens in either the test or holding furnacewithout an applied load, and heat to the test temperature usingthe following schedule:7.1.1 B

22、urned Refractory ProductsThe rate of heatingfrom room temperature shall not exceed 600F (330C)/h to1800F (980C), and shall not exceed 200F (110C)/h from1800F to the test temperature (Note 4). Maintain the testtemperature for a minimum of3h(Note 5).NOTE 4Heating at 600F (330C)/h can initiate thermal

23、shock insome brick. A maximum heating rate of 150F (83C)/h is recommendedfor materials sensitive to thermal shock.NOTE 5Maintaining specimens at test temperature for 3 h before loadapplication is adequate for most compositions and temperatures ofinterest. However, there may be certain compositions a

24、nd temperaturesrequiring additional holding time at temperature in order to obtainconsistent results. Experience and use of the test procedure will aid indetermining when exploratory testing is required to arrive at the holdingtime necessary. If departure is made from the specified minimum time, the

25、holding time used will be included in the report of the results.7.1.2 Unburned or Chemically Bonded RefractoryProductsThe rate of heating from room temperature shall be600F (330C)/h to 1800F (980C), and 200F (110C)/hfrom 1800F to the test temperature. Maintain the test tem-perature for a minimum of

26、12 h.7.2 Following the holding period, move the specimen to thesupporting bearing edges. When possible, an original face ofthe specimen shall be used for the tension face, that is, the facein contact with the two lower bearing edges. Apply the loadparallel to the direction (if known) of pressing of

27、the specimen.7.3 Control test temperature by the thermocouple that islocated within12 in. (13 mm) of the geometric center of a sideface of the specimen when it is in position for testing. Holdspecimen in testing position 10 min before testing (Note 6).Temperature shall not vary more than minus 0 plu

28、s 20F(11C) from the specified test temperature.NOTE 6This hold period may be shortened for continuously chargedfurnaces.7.4 Test temperatures are not specified but must be agreedupon between laboratories and must be included in the report.FIG. 1 Cross Section of Typical Apparatus (Heating Means Not

29、Shown)C583052Test temperatures should be selected in even 100F (55C)intervals, but if agreed, other multiples could be used.7.5 Bring the top bearing edge to bear at mid-span on thespecimen, ensure proper alignment of bearing surfaces, andapply pressure through the loading mechanism until failure of

30、the specimen occurs. The rate of application of the load on thespecimen shall be 175 6 17.5 lbf (778 6 77.8 N)/min. Theresulting rate of increase in bending stress for the standard 1 by1 by 6-in. (25 by 25 by 152-mm) specimen is 1312.5 6 131 psi(9.05 6 0.9 MPa)/min.3If non-standard specimens are use

31、d,the proper loading rate should be determined from the forego-ing stressing rate and full details disclosed in the report.7.6 Move the other specimens successfully onto the bearingedges and break them in accordance with the precedingprocedure.8. Calculation8.1 Calculate the modulus of rupture (MOR)

32、 for eachrectangular specimen as follows:MOR 5 3PL/2bd2(1)where:MOR = modulus of rupture, psi or MPa,P = concentrated load at rupture, lbf or N,L = span between supports, in. or mm,b = breadth or width of specimen, in. or mm, andd = depth of specimen, in. or mm.9. Report9.1 Report the test temperatu

33、re, the five individual testresults, and the average modulus of rupture and standarddeviation in lbf/in.2(or MPa for the five specimens.9.2 Also, list in the report any deviations from standard testrequirements such as specimen size, span, heating rate, soaktime, or loading rate.10. Precision and Bi

34、as10.1 Ruggedness tests conducted in 1977 showed that themost sensitive variables were specimen dimensions, test tem-perature, and soak time. Of smaller influence were heating rateabove 1800F (980C) and loading rate. Test results areincorporated in the method.10.2 Interlaboratory Test DataThe result

35、s of interlabora-tory studies conducted in 1963 and in 1970 were used in 1979to revise the precision statements in accordance with latestrecommendations from ASTM Committee E11.10.2.1 In the 1963 study, four types of direct-bonded (fired)magnesite-chrome brick and two types of chemically-bondedmagne

36、site-chrome brick were tested at 1800F (980C) and2300F (1260C). Five laboratories tested five specimens ofeach brick at each test temperature. In the 1970 study, twotypes of direct-bonded chrome brick, one 95 % MgO firedpericlase brick (BOF type), and one 90 % alumina brick weretested at 2700F (1480

37、C) by four laboratories using twentyspecimens of each type of brick.10.2.2 The precision was found to vary with the type ofbrick tested and also with the test temperature. Generally thestandard deviation was proportional to the strength level, andrelative precision is given in terms of the average c

38、oefficientsof variation for each brick type and test temperature. However,in the case of fired brick, the relative precision tends toimprove with the level of strength.10.3 PrecisionFor two averages of five specimens testedwithin one laboratory, their difference is considered significantfor a probab

39、ility of 95 % and t = 1.96 if it equals or exceedsthe repeatability interval for the applicable brick type in Table1. Likewise, the difference between two averages obtained bytwo laboratories is considered significant if it equals or exceedsthe applicable reproducibility interval in Table 1.10.4 Bia

40、sNo justifiable statement of bias is possiblebecause the true value of hot modulus of rupture cannot beestablished.11. Keywords11.1 compressive load; deformation resistance; flexuralstrength; high temperature; modulus of rupture; monolithicrefractories; refractory brick3This rate is 0.151 MPa/s, whi

41、ch is in agreement with the stress rate in PRERecommendation R 18, “Determination of the Hot Modulus of Rupture of Shapedand Unshaped Dense and Insulating Refractory Products”, 1978. Copies of PREstandards are available from the PRE Secretary, Lowenstrasse 31, P.O. Box 3361,CH-8023 Zurich, Switzerla

42、nd.C583053ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such r

43、ights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for addition

44、al standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the AS

45、TM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the abo

46、veaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org).TABLE 1 Relative PrecisionBrick TypeTest Temperature Average MOR Coefficient of VariationRepeatabilityInterval, % ofAverageAReproducibilityInterval, % ofAverageAF C psi MP

47、aWithinLabs, %BetweenLabs, %Chem-bond 1800 980 360 2.48 14.2 13.5 17.6 41.2Chem-bond 2300 1260 332 2.29 7.7 13.6 9.4 39.1Direct-bond 1800 980 1530 10.55 15.7 17.4 19.4 52.9Direct-bond 2300 1260 1208 8.33 17.9 15.3 22.2 47.9Direct-bond 2700 1480 708 4.88 32.3 29.8 40.0 91.7Periclase 2700 1480 1302 8.98 21.0 16.2 26.4 52.0Alumina 2700 1480 1836 12.66 17.6 10.4 21.8 36.1ABased on five specimens.C583054