1、Designation: C 22/C 22M 00 (Reapproved 2005)e1Standard Specification forGypsum1This standard is issued under the fixed designation C 22/C 22M; the number immediately following the designation indicates the yearof original adoption or, in the case of revision, the year of last revision. A number in p
2、arentheses indicates the year of last reapproval.A superscript epsilon (e) indicates an editorial change since the last revision or reapproval.e1NOTEParagraph 1.3 was added editorially October 2005.1. Scope1.1 This specification covers gypsum, calcium sulfate com-bined with two molecules of water in
3、 crystalline form andhaving the approximate chemical formula CaSO42H2O.1.2 The values stated in either inch-pound units or SI(metric) are to be regarded separately as the standard. Withinthe text, the SI units are shown in brackets. The values statedin each system shall be used independently of the
4、other. Valuesfrom the two systems shall not be combined.1.3 The text of this specification references notes andfootnotes which provide explanatory material. These notes andfootnotes (excluding those in tables and figures) shall not beconsidered as requirements of the specification.2. Referenced Docu
5、ments2.1 ASTM Standards:2C11 Terminology Relating to Gypsum and Related Build-ing Materials and SystemsC 471M Test Methods for Chemical Analysis of Gypsumand Gypsum Products MetricC 472 Test Methods for Physical Testing of Gypsum, Gyp-sum Plasters and Gypsum Concrete3. Terminology3.1 DefinitionsDefi
6、nitions shall be in accordance withTerminology C11.4. Chemical Composition4.1 Gypsum shall contain not less than 70.0 weight percentCaSO42H2O.4.2 The chemical composition, within the limits prescribedby 4.1, shall be specified in the purchase order or contract.5. Physical Properties5.1 SizeIf necess
7、ary, gypsum shall be crushed or ground,or both, to the size specified in the purchase order.6. Sampling6.1 BulkWhen gypsum is shipped in bulk, samples ofapproximately 5 lb 2 kg each shall be taken at regularintervals during the complete loading or unloading of thecarrier, in such a way as to accumul
8、ate not less than 200 lb 90kg of material and to represent correctly the percentages ofboth the coarse particles and the fines in the shipment. Thismaterial shall be broken to pass a 1-in. 25.0-mm sieve,thoroughly mixed, and reduced by quartering to provide notless than a 1-lb 0.5-kg sample for the
9、laboratory.6.2 PackagesWhen gypsum is shipped in packages, notless than 1 % of the packages shall be sampled. Samples shallbe taken from both the surface and the center of the packages.These samples shall then be broken, mixed, and quartered inaccordance with 6.1.6.3 Laboratory SamplesEach laborator
10、y sample shall beplaced immediately in an airtight container and shipped to thelaboratory for testing.7. Test Methods7.1 The chemical composition of gypsum shall be deter-mined in accordance with Test Methods C 471M.7.2 The physical properties of gypsum shall be determinedin accordance with Test Met
11、hods C 472.8. Inspection8.1 Inspection of the gypsum shall be agreed upon betweenthe purchaser and the supplier as part of the purchase agree-ment.9. Rejection9.1 Rejection of gypsum that fails to conform to therequirements of this specification shall be reported to theproducer or supplier promptly
12、and in writing. The notice ofrejection shall contain a statement documenting how thegypsum has failed to conform to the requirements of thisspecification.1This specification is under the jurisdiction of ASTM Committee C11 onGypsum and Related Building Materials and Systems and is the direct responsi
13、bilityof Subcommittee C11.01 on Specifications and Test Methods for Gypsum Products.Current edition approved October 1, 2005. Published November 2005. Originallyapproved in 1919. Last previous edition approved in 2000 as C 22/C 22M 00.2For referenced ASTM standards, visit the ASTM website, www.astm.
14、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 19428-2959, United States.10. Certifi
15、cation10.1 When specified in the purchase agreement, a manufac-turers or suppliers report shall be furnished at the time ofshipment certifying that the product is in compliance with thisspecification.11. Packaging and Package Marking11.1 Gypsum shall be shipped either in packages or in bulk.11.2 Whe
16、n shipped in packages for resale, the followinginformation (See Note 1) shall be legibly marked on eachpackage or on a tag of suitable size attached thereto:11.2.1 Name of manufacturer,11.2.2 Description of material, and11.2.3 Net or gross weights, or both, of the package.11.3 When shipped in bulk,
17、a card containing the requiredinformation in accordance with 11.2 shall be conspicuouslyplaced in the carrier.NOTE 1State law may require additional information.12. Keywords12.1 calcium sulfate; gypsumASTM International takes no position respecting the validity of any patent rights asserted in conne
18、ction 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, are entirely their own responsibility.This standard is subject to revision at any time by the responsi
19、ble 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 standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful co
20、nsideration 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 Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100
21、 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 22/C 22M 00 (2005)e12
