1、Designation:C490/C490M17Standard Practice forUse of Apparatus for the Determination of Length Change ofHardened Cement Paste,Mortar,and Concrete1This standard is issued under the fixed designation C490/C490M;the number immediately following the designation indicates the yearof original adoption or,i
2、n the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.A superscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope*1.1 This practice covers the requirements for the apparatusand equipment used to prepare s
3、pecimens for the determinationof length change in hardened cement paste,mortar,andconcrete,the apparatus and equipment used for the determina-tion of these length changes,and the procedures for its use.1.2 Methods for the preparation and curing of testspecimens,conditions of testing and curing,and d
4、etailedprocedures for calculating and reporting test results are con-tained in applicable test methods.1.3 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 exact equivalents;therefore,eachsystem shall be used
5、 independently of the other.Combiningvalues from the two systems may result in non-conformancewith the standard.2.Referenced Documents2.1 ASTM Standards:2C219 Terminology Relating to Hydraulic CementC511 Specification for Mixing Rooms,Moist Cabinets,Moist Rooms,and Water Storage Tanks Used in theTes
6、ting of Hydraulic Cements and ConcretesC1005 Specification for Reference Masses and Devices forDetermining Mass and Volume for Use in the PhysicalTesting of Hydraulic Cements3.Terminology3.1 Definitions:3.1.1 For definitions of terms used in this test method,referto Terminology C219.4.Significance a
7、nd Use4.1 This practice is intended to provide standard require-ments for apparatus common to many test methods used inconnection with cement and concrete and standardized proce-dures for its use.The detailed requirements as to materials,mixtures,specimens,conditioning of specimens,number ofspecimen
8、s,ages at which measurements are to be made,interpretation of results,and precision and bias are left to bedealt with in specific test methods.5.Apparatus5.1 Reference Masses and Devices for Determining Massand Volume,shall conform to the requirements of SpecificationC1005.5.2 Molds,shall have eithe
9、r one or two compartments andshall be constructed as shown in Fig.1 or Fig.2.Molds for testspecimens used in determining the length change of cementpastes and mortars shall provide for 25 by 25 by 285-mmprisms having a 250-mm gauge length,or for 1 by 1 by 1114-in.prisms having a 10in.gauge length.Mo
10、lds for test specimensused in the length change of concretes shall provide for prismsof the desired cross section having a 10-in.or 250-mm gaugelength.In some routine tests,25 by 25 by 160-mm specimenswith a gauge length of 125 mm,or 1 by 1 by 614-in.specimenswith a gauge length of 5-in.are permitte
11、d,but in case ofdispute,results obtained with specimens of 250-mm 10-in.gauge length shall govern.5.2.1 The gauge length shall be considered as the nominallength between the innermost ends of the gauge studs.Theparts of the molds shall be tight fitting and firmly held togetherwhen assembled,and thei
12、r surfaces shall be smooth and free ofpits.The molds shall be made of steel or other hard metal notreadily attacked by the cement paste,mortar,or concrete.Thesides of the molds shall be sufficiently rigid to preventspreading or warping.For the molds shown in Fig.1,thetolerance on dimensionAis 60.7 m
13、m.For the molds shown inFig.2,the tolerance on dimension A is 60.03 in.5.2.2 Each end plate of the mold shall be equipped to holdproperly in place,during the setting period,one of the gaugestuds shown in Fig.1 or Fig.2.The gauge studs shall be of1This practice is under the jurisdiction ofASTM Commit
14、tee C01 on Cement andis the direct responsibility of Subcommittee C01.95 on Coordination of Standards.Current edition approved March 15,2017.Published March 2017.Originallyapproved in 1962.Last previous edition approved in 2011 as C490/C490M 111.DOI:10.1520/C0490_C0490M-17.2For referenced ASTM stand
15、ards,visit the ASTM website,www.astm.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.*A Summary of Changes section appears at the end of this standardCopyright ASTM Internationa
16、l,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 American Iron and Steel Institute(AISI)3Type 316 stainlesssteel or other corrosion-resistant metal of s
