1、Designation: C 568 08aStandard Specification forLimestone Dimension Stone1This standard is issued under the fixed designation C 568; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A number in parentheses
2、 indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the Department of Defense.1. Scope1.1 This specification covers the material characteristics,physical requirement
3、s, and sampling appropriate to the selec-tion of limestone for general building and structural purposes.Refer to Guides C 1242 and C 1528 for the appropriateselection and use of limestone dimension stone.1.2 Dimension limestone shall include stone that is sawed,cut, split, or otherwise finished or s
4、haped and shall specificallyexclude molded, cast, or otherwise artificially aggregated unitsof composed fragments, and also crushed and broken stone.2. Referenced Documents2.1 ASTM Standards:2C97 Test Methods for Absorption and Bulk Specific Grav-ity of Dimension StoneC99 Test Method for Modulus of
5、Rupture of DimensionStoneC119 Terminology Relating to Dimension StoneC 170 Test Method for Compressive Strength of DimensionStoneC 241 Test Method for Abrasion Resistance of Stone Sub-jected to Foot TrafficC 1242 Guide for Selection, Design, and Installation ofDimension Stone Anchoring SystemsC 1353
6、 Test Method Using the Taber Abraser for AbrasionResistance of Dimension Stone Subjected to Foot TrafficC 1528 Guide for Selection of Dimension Stone for Exte-rior Use3. Terminology3.1 DefinitionsAll definitions are in accordance with Ter-minology C119.4. Classification4.1 Dimension limestone shall
7、be classified into three cat-egories, generally descriptive of those limestones having den-sities in approximate ranges, as follows:4.1.1 I (Low-Density)Limestone having a density rang-ing from 110 through 135 lb/ft3(1760 through 2160 kg/m3).4.1.2 II (Medium-Density)Limestone having a densitygreater
8、 than 135 and not greater than 160 lb/ft3(2160 through2560 kg/m3).4.1.3 III (High-Density)Limestone having a densitygreater than 160 lb/ft3(2560 kg/m3).5. Physical Requirements5.1 Limestone supplied under this specification shall con-form to the physical requirements listed in Table 1.5.2 Limestone
9、shall be sound, durable, and free of spalls,cracks, open seams, pits, or other defects that are likely toimpair its structural integrity in its intended use.5.3 The desired color and texture, with their permissiblenatural variations in material characteristics for all material tobe produced for the
10、project, shall be established by controlsamples. Select representative samples by viewing a sufficientnumber of physical samples prior to production that show thecomplete range of variations in color and texture of thelimestone specified.6. Sampling6.1 Samples, if required, for testing to determine
11、the char-acteristics and physical properties shall be representative of thelimestone to be used.7. Keywords7.1 calcium carbonate; limestone1This specification is under the jurisdiction of ASTM Committee C18 onDimension Stone and is the direct responsibility of Subcommittee C18.03 onMaterial Specific
12、ations.Current edition approved Oct. 1, 2008. Published November 2008. Originallyapproved in 1965 . Last previous edition approved in 2008 as C 568 08.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStan
13、dards 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.ASTM International takes no position respecting the validity of any patent rights asserted in c
14、onnection 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 resp
15、onsible 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 carefu
16、l 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 Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International,
17、 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 AST
18、M website(www.astm.org).TABLE 1 Physical RequirementsNOTEThe values in Table 1 were established using samples prepared according to the individual test methods. Finishes, other than those specifiedin the individual test methods, may result in a deviation from established values.Physical PropertyTest
19、 Requirements Classification Test Meth-od(s)Absorption by weight, max, % 127.53IIIIIIlow-densitymedium-densityhigh-densityC97Density, min, lb/ft3(kg/m3) 110 (1760)135 (2160)160 (2560)IIIIIIlow-densitymedium-densityhigh-densityC97Compressive strength, min, psi (MPa) 1800 (12)4000 (28)8000 (55)IIIIIIl
20、ow-densitymedium-densityhigh-densityC 170Modulus of rupture min, psi (MPa) 400 (2.9)500 (3.4)1000 (6.9)IIIIIIlow-densitymedium-densityhigh-densityC99Abrasion resistance, min, hardnessA,B,C101010IIIIIIlow-densitymedium-densityhigh-densityC 241/C 1353APertains only to stone subject to foot traffic.BTh
21、e supplier of the No. 60Alundum abrasive, Norton, has indicated that the formula for Norton treatment 138S has been changed. The new abrasive is currrently moreaggressive, resulting in lower abrasive hardness values (Ha) than when the standard was initially established. As such, care should be taken
22、 when interpreting Havaluesfrom tests using the new abrasive, particularly with regard to currentASTM stone standard specification requirements for abrasion resistance, which were developed whenthe original abrasive was still in use. Committee C18 is actively studying alternatives to address this issue.CAbrasion Resistance Test Method C 1353 will eventually replace Test Method C 241 and it is not necessary to perform both tests. Availability of the proper equipmentand materials by the testing laboratory may determine which test is performed.C 568 08a2
