1、Designation: C 975 87 (Reapproved 2009)Standard Practice forPreparing Test Specimens from Basic Refractory RammingProducts by Pressing1This standard is issued under the fixed designation C 975; 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 () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This practice covers a procedure for preparing testspecimens from basic refractory ramming prod
3、ucts by pressingprepared material in a mold. Specimens prepared in accordancewith this procedure are intended for use inASTM test methods.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
4、 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 o
5、f 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 laboratories of produc-ers, users, and general-interest parties for research and
6、devel-opment or quality-control work. It is particularly useful forinterlaboratory comparisons of products, for repetitive evalua-tions or comparisons of products or product quality, and inspecifying a uniform preparation practice for specimens foracceptance testing.2.3 In using this practice it mus
7、t be recognized that thestructure of laboratory-pressed specimens may differ signifi-cantly from the structure of material rammed in field applica-tions.3. Apparatus3.1 Mixer, bench-type, Hobart or equivalent.3.2 Press, mechanical or hydraulic.3.3 Steel Molds.3.4 Oven, air circulating.3.5 Trowel.4.
8、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 precautions to preventsegregation. Sufficient material should be batched to provide atleast a 10 % excess over te
9、st 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) within 30 s. Wet-mixat low speed for 3 min.4.3.1 Use the amount of water and mixing time (if differentfrom above) r
10、ecommended 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 of the desired size should be pressed imme-diately after the batch is mixed. Weigh the proper amount ofmaterial for each specime
11、n to the nearest 0.02 lb (10 g), anddistribute the mix uniformly in the mold using the narrow edgeof a trowel. The remainder of the batch should be covered witha damp cloth during the pressing procedure. Press test speci-mens at 10 000 psi (68.95 MPa).4.5 Test specimens should be air-dried for 4 h,
12、and thendried for a minimum of8hat2256 5F (107 6 2.5C) in acirculating air dryer prior to testing. Testing should be carriedout within 48 h.5. Calculation and Report5.1 In the report on specimen preparation, include thepercent water addition, drying time, and test specimen size.1This practice is und
13、er the jurisdiction ofASTM Committee C08 on Refractoriesand is the direct responsibility of Subcommittee C08.09 on Monolithics.Current edition approved March 1, 2009. Published April 2009. Originallyapproved in 1982. Last previous edition approved in 2004 as C 975 87 (2004).1Copyright ASTM Internati
14、onal, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.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
15、of the validity of any such patent rights, and the riskof infringement of such rights, 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
16、. Your comments are invited either for revision of this standard or for additional 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 com
17、ments have not received a fair hearing you shouldmake your views known to the ASTM 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 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 975 87 (2009)2
