1、Designation:C617/C617M15Standard Practice forCapping Cylindrical Concrete Specimens1This standard is issued under the fixed designation C617/C617M;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
2、parentheses indicates the year of last reapproval.A superscript epsilon()indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the U.S.Department of Defense.1.Scope*1.1 This practice covers apparatus,materials,and proce-dures for c
3、apping freshly molded concrete cylinders with neatcement and hardened cylinders and drilled concrete cores withhigh-strength gypsum paste or sulfur mortar.1.2 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard.The values stated ineach system may not be
4、exact equivalents;therefore,eachsystem shall be used independently of the other.Combiningvalues from the two systems may result in non-conformancewith the 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 us
5、er of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.For specificprecaution statements see 4.3.1 and 6.2.4.1.2.Referenced Documents2.1 ASTM Standards:2C109/C109M Test Method for Compressive Strength ofHydrau
6、lic Cement Mortars(Using 2-in.or 50-mm CubeSpecimens)C150 Specification for Portland CementC472 Test Methods for Physical Testing of Gypsum,Gyp-sum Plasters and Gypsum ConcreteC595 Specification for Blended Hydraulic CementsC1231/C1231M Practice for Use of Unbonded Caps inDetermination of Compressiv
7、e Strength of Hardened Con-crete Cylinders2.2 ANSI Standard:3B46.1 Standard for Surface Texture(Surface,Roughness,Waviness and Lay)3.Significance and Use3.1 This practice describes procedures for providing planesurfaces on the ends of freshly molded concrete cylinders,hardened cylinders,or drilled c
8、oncrete cores when the endsurfaces do not conform with the planeness and perpendicu-larity requirements of applicable standards.Practice C1231/C1231M describes alternative procedures using unbonded capsor pad caps.4.Capping Equipment4.1 Capping PlatesNeat cement caps and high-strengthgypsum-paste ca
9、ps shall be formed against a glass plate at least6 mm 14in.thick,a machined metal plate at least 11 mm0.45 in.thick,or a polished plate of granite or diabase at least75 mm 3 in.thick.Sulfur mortar caps shall be formed againstsimilar metal or stone plates except that the recessed areawhich receives m
10、olten sulfur shall not be deeper than 12 mm12in.In all cases,plates shall be at least 25 mm 1 in.greater in diameter than the test specimen and the workingsurfaces shall not depart from a plane by more than 0.05 mm0.002 in.in 150 mm 6 in.The surface roughness of newlyfinished metal plates shall not
11、exceed that set forth in Table 4of American National Standard B46.1,or 3.2 m 125 in.forany type of surface and direction of lay.The surface,whennew,shall be free of gouges,grooves,or indentations beyondthose caused by the finishing operation.Metal plates that havebeen in use shall be free of gouges,
12、grooves,and indentationsgreater than 0.25 mm 0.010 in.deep or greater than 30 mm20.05 in.2 in surface area.NOTE1A Rockwell hardness of 48 HRC is suggested for cappingplates of devices used to form sulfur mortar caps.4.2 Alignment DevicesSuitable alignment devices,such asguide bars or bulls-eye level
13、s,shall be used in conjunctionwith capping plates to ensure that no single cap will departfrom perpendicularity to the axis of a cylindrical specimen by1This practice is under the jurisdiction of ASTM Committee C09 on Concreteand ConcreteAggregates and is the direct responsibility of Subcommittee C0
14、9.61 onTesting for Strength.Current edition approved April 1,2015.Published May 2015.Originallyapproved in 1968.Last previous edition approved in 2012 as C617/C617M 12.DOI:10.1520/C0617_C0617M-15.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at se
15、rviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3Available from American National Standards Institute(ANSI),25 W.43rd St.,4th Floor,New York,NY 10036,http:/www.ansi.org.*A Summary of Changes section appears at the end
16、of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 more than 0.5(See Note 2).The same requirement isapplicable to the relationship between the axis of the alignmentdevice and the surface of a capping plate when guide bars areused.In addition,the location of each bar with respect to itsplate must be such that no cap will be off-centered on a testspecimen by more than 2 mm 116in.NOTE2A deviation from perpendicularity of 0.5
