1、Designation: C 974 87 (Reapproved 2004)Standard Practice forPreparing Test Specimens from Basic Refractory CastableProducts by Casting1This standard is issued under the fixed designation C 974; the number immediately following the designation indicates the year oforiginal adoption or, in the case of
2、 revision, the year of 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 practice covers a procedure for preparing testspecimens from a basic refractory castable
3、by casting preparedmaterial in a mold. Specimens prepared in accordance with thisprocedure are intended for use in ASTM test methods.1.2 This standard does not purport to address all of thesafety problems, if any, associated with its use. It is theresponsibility of the user of this standard to estab
4、lish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2. Significance and Use2.1 This practice defines a procedure that ensures consistentpreparation of specimens for product testing and evaluation.2.2 This practice can be used in the l
5、aboratories of produc-ers, users, and general-interest parties for research and devel-opment or quality-control work. It is particularly useful forinterlaboratory comparisons or products, for repetitive evalua-tions or comparisons of products or product quality, and inspecifying a uniform preparatio
6、n practice for specimens foracceptance testing.2.3 In using this practice it must be recognized that thestructure of laboratory-cast specimens may differ significantlyfrom the structure of material cast in field applications.3. Apparatus3.1 Mixer, bench-type, Hobart or equivalent.3.2 Steel Molds.3.3
7、 Vibration Table, spring or air-cushioned, with a pneu-matic or electric driver.23.4 Oven, air circulating.4. Procedure4.1 Store the material to be tested at 85 6 2F (29.5 6 1C)for 24 h prior to testing.4.2 Reduce the sample to the desired batch size with asample splitter or by quartering, taking pr
8、ecautions to preventsegregation. Sufficient material should be batched to provide atleast a 10 % excess over test specimen requirements.4.3 Add the weighed, dry batch to the mixer and dry-mix atlow speed for 30 s. Continue to mix at low speed while addingthe required amount of water (see 4.3.1) with
9、in 30 s. Wet-mixat low speed for 4 min.4.3.1 Use the amount of water and mixing time (if differentfrom above) recommended by the manufacturer. The watermust be potable and at a temperature of 85 6 2F (29.5 61C). Measure the water addition to the nearest 0.1 % byweight.4.4 Specimens should be cast in
10、 a mold immediately afterthe batch is mixed so that all specimens made from a batch arecast at the same time. The mold should be securely clamped tothe vibration table top. Fill the mold to overflowing distributingthe material uniformly between each cavity. Vibrate in accor-dance with the manufactur
11、ers instructions. Approximately 15s before the end of the vibration period, remove excess material(approximately flush with top of mold).4.4.1 If the batch is too wet, water will run off the specimenswhile if the batch is too dry, the material will not fill the mold.In either case the batch must be
12、discarded and another runmade at a suitable water content.4.5 Test specimens should be air-dried in the molds aminimum of 16 h and a maximum of 24 h, and then removedfrom the molds and dried for a minimum of8hat2256 5F(107 6 2.5C) in a circulating air dryer prior to testing.5. Calculation and Report
13、5.1 In the report on specimen preparation, include thepercent water addition, drying time, and test specimen size.1This practice is under the jurisdiction ofASTM Committee C08 on Refractoriesand is the direct responsibility of Subcommittee C08.09 on Monolithics.Current edition approved March 1, 2004
14、. Published March 2006. Originallyapproved in 1982. Last previous edition approved in 1998 as C 974 87 (1998).2Martin Engineering Model CV35 or Syntron Model VP-80 has been foundsuitable.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United State
15、s.ASTM 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 rights, a
16、re 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 additional stand
17、ardsand 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 ASTM Commi
18、ttee 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 aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org).C 974 87 (2004)2
