ASTM C1446-2007 Standard Test Method for Measuring Consistency of Self-Flowing Castable Refractories《自流式可浇铸耐火材料的粘稠度测量用标准试验方法》.pdf
《ASTM C1446-2007 Standard Test Method for Measuring Consistency of Self-Flowing Castable Refractories《自流式可浇铸耐火材料的粘稠度测量用标准试验方法》.pdf》由会员分享,可在线阅读,更多相关《ASTM C1446-2007 Standard Test Method for Measuring Consistency of Self-Flowing Castable Refractories《自流式可浇铸耐火材料的粘稠度测量用标准试验方法》.pdf(4页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: C 1446 07Standard Test Method forMeasuring Consistency of Self-Flowing CastableRefractories1This standard is issued under the fixed designation C 1446; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last r
2、evision. 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 the determination of the con-sistency (degree of self-flow) and working time of self-flowingcastabl
3、e refractories. This test may optionally be used todetermine working time of self-flowing castables.1.2 The values stated in inch-lb. units are to be regarded asthe standard. The values given in parentheses are for informa-tion only.1.3 This standard does not purport to address all of thesafety conc
4、erns, 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:2C 71 Terminology Relating to Refractori
5、esC 230/C 230M Specification for Flow Table for Use in Testsof Hydraulic CementC 860 Practice for Determining the Consistency of Refrac-tory Castable Using the Ball-In-Hand TestC 862 Practice for Preparing Refractory Concrete Speci-mens by CastingC 1445 Test Method for Measuring Consistency of Casta
6、bleRefractory Using a Flow Table3. Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 consistency of self-flowing castable refractoriesthedegree of mobility (self-flow) of the refractory castable underits own weight as described in this test method at the specifiedtimes after adding
7、 liquid to the mixer.3.1.2 working time of self-flowing castable refractoriesthe elapsed time from the first addition of liquid during mixinguntil the mix will only achieve 25 % self-flow using theprocedure described in this test method.4. Summary of Test Method4.1 The castable refractory is mixed w
8、ith a tempering liquidand the percentage of self-flow is measured. Self-flow is thepercent increase in the diameter of the sample after removingthe Specification C 230 cone mold and allowing the specimento flow (spread) under it own weight for 120 s. The consistencyis measured 10 min after water add
9、ition. Working time mayoptionally be determined by repeating the self flow test atregular time intervals.5. Significance and Use5.1 This test method is used to measure the consistency(degree of self-flow) that a castable refractory demonstrates ata given level of tempering liquid at specified time i
10、ntervalsafter the liquid is added. A self-flow of 25 % has been selectedas the minimum at which a mix can be poured into typicalmolds or forms in normal practice.5.2 Castable refractories which are self-flowing at one levelof tempering liquid will require vibration for placement atsome lower level o
11、f tempering liquid. At the tempering liquidlevels which require vibration or tamping for placement, thecastable refractory should be characterized using test methodswhich are appropriate for castable refractories designed forvibration placement, such as Test Method C 1445.5.3 This test method is not
12、 appropriate for determining thepumpability of castable refractories.6. Interferences (Factors Known to Affect Results)6.1 During method development, a ruggedness evaluationwas performed using a castable comprised of 5 % cement,17 % reactive alumina, and 78 % tabular alumina. Severalfactors were fou
13、nd to cause statistically significant effects onthe measured results. See ASTM Research Report No.C081016.6.1.1 Amount of Mixing LiquidThe amount of mixingliquid affects the measured results for typical self-flowingcastable refractories unless added by weight to within 6 0.0021This test method is un
14、der the jurisdiction of ASTM Committee C08 onRefractories and is the direct responsibility of Subcommittee C08.09 on Monolith-ics.Current edition approved March 1, 2007. Published April 2007. Originallyapproved in 1999. Previous edition approved in 1999 as C 1446 99.2For referenced ASTM standards, v
15、isit 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 Harbor Drive, PO Box C700, West Conshohocken, PA 19428
16、-2959, United States.lb (6 1 g) of the target weight for a 16.52lb (7500-g) sampleweight. The target liquid level is a percentage of the dry weightof the batch.6.1.2 TemperatureDuring ruggedness testing the effect oftemperature was evaluated. The test mix, tempering liquid, androom temperature were
17、controlled to the same targets. Whenthe temperature was raised by 3.5F (70.3 to 73.8F) workingtime was found to be reduced by an average of 10 min. Whilethe degree of this effect may be castable-formulation-dependent, it is accepted that temperature will affect theworking time for all typical self-f
18、lowing castables.6.1.3 Mold Filling LevelDuring ruggedness testing it wasfound that filling the mold to a level of132 in. below the top ofthe mold reduced the measured flow at 10 min after addingliquid to the mixer by approximately 5.5 % for a mix with anaverage flow of approximately 115 % at this e
19、lapsed time.6.1.4 Mold Lifting TechniqueDuring ruggedness testing itwas found that the technique for lifting the mold from thesample affected the results. The techniques compared werelifting the mold straight up and twisting the mold approxi-mately 45 as it was lifted off the sample. Twisting the mo
20、ldwhile lifting resulted in an appropriate 4.5 % increase in themeasured self-flow at 10 min after adding liquid to the mixer.6.2 Factors which were found to be rugged during methoddevelopment for percentage self-flow at 10 min after addingtempering liquid to the mixer were (1) ambient temperaturewh
21、en varied from 70F to 74F, (2) tempering liquid whenvaried by 0.1 %, (3) holding time from filling the mold tolifting the mold when varied from 20 to 60 s, and (4)lubricating the flow surface and wiping clean prior to placingthe specimen on the flow surface as compared to no lubricationon a clean me
22、tal surface.6.3 Factors which were found to be rugged during methoddevelopment for working time were (1) holding time fromfilling the mold to lifting the mold when varied from 20 to 60s, (2) lubricating the flow surface and wiping clean prior toplacing the specimen on the flow surface as compared to
23、 nolubrication on a clean metal surface, (3) returning the castableto the storage container after each flow measurement whencompared to discarding the castable used for each flowmeasurement, and (4) storing the castable in a covered mixingbowl when compared to storing in a sealed container.7. Appara
24、tus7.1 Cone MoldThe mold used to form the specimen is inaccordance with Specification C 230.7.2 Measuring CaliperEither a caliper in accordance withSpecification C 230 which reads directly in percent flow or astandard caliper that can be read to within 6 0.004 in. (60.1-mm) accuracy can be used7.3 F
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