1、Designation:C827/C827M16Standard Test Method forChange in Height at Early Ages of Cylindrical Specimens ofCementitious Mixtures1This standard is issued under the fixed designation C827/C827M;the number immediately following the designation indicates the yearof original adoption or,in the case of rev
2、ision,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 test method covers the determination of change inheight of cylindrical specimens from the time of
3、molding untilthe mixture is hard.1.2 This test method covers height change measurements atearly ages for cementitious mixtures of paste,grout,mortar,and concrete.1.3 This test method is intended for determination ofchanges in height that occur from the time of placement untilthe specimen is fully ha
4、rd.These include shrinkage or expan-sion due to hydration,settlement,evaporation,and otherphysical and chemical effects.1.4 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,eachsys
5、tem shall be used independently of the other.Combiningvalues from the two systems may result in non-conformancewith the standard.1.5 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 ap
6、pro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.1.6 The text of this test method references notes andfootnotes that provide explanatory information.These notesand footnotes shall not be considered as requirements of thetest method.2.Refe
7、renced Documents2.1 ASTM Standards:2C125 Terminology Relating to Concrete and Concrete Ag-gregatesC138/C138M Test Method for Density(Unit Weight),Yield,and Air Content(Gravimetric)of ConcreteC143/C143M Test Method for Slump of Hydraulic-CementConcreteC185 Test Method for Air Content of Hydraulic Cem
8、entMortarC191 Test Methods for Time of Setting of Hydraulic Cementby Vicat NeedleC192/C192M Practice for Making and Curing Concrete TestSpecimens in the LaboratoryC305 Practice for Mechanical Mixing of Hydraulic CementPastes and Mortars of Plastic ConsistencyC403/C403M Test Method for Time of Settin
9、g of ConcreteMixtures by Penetration ResistanceC670 Practice for Preparing Precision and Bias Statementsfor Test Methods for Construction MaterialsC807 Test Method for Time of Setting of Hydraulic CementMortar by Modified Vicat NeedleC939 Test Method for Flow of Grout for Preplaced-Aggregate Concret
10、e(Flow Cone Method)C953 Test Method for Time of Setting of Grouts forPreplaced-Aggregate Concrete in the LaboratoryC1437 Test Method for Flow of Hydraulic Cement Mortar3.Terminology3.1 DefinitionsThe terms used in this test method aredefined in Terminology C125.3.2 Definitions of Terms Specific to T
11、his Standard:3.2.1 early-age change in height,nthe measured increaseor decrease in height of a laterally confined cylindrical testspecimen from the time of molding to when the mixturebecomes hard.The user may want to define this age as the timewhen a companion specimen of the same batch has reached
12、thetime of final setting by Test Method C191(paste),C953(mortar or grout),C403/C403M(concrete),or establish apredetermined age in minutes from the time the specimen iscast as the defined age to record the final measurement.Changes in height are measured and expressed as a positive ornegative change
13、in the height of a test specimen that isrestrained from lateral movement.1This test method is under the jurisdiction of ASTM Committee C09 onConcrete and Concrete Aggregates and is the direct responsibility of SubcommitteeC09.68 on Volume Change.Current edition approved April 1,2016.Published June 2
14、016.Originallyapproved in 1975.Last previous edition approved in 2010 as C827 10.DOI:10.1520/C0827_C0827M-16.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standard
15、s Document Summary page onthe ASTM website.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 4.Significance and Use4.1 This test method provides a means for comparing therelat
16、ive shrinkage or expansion of cementitious mixtures.It isparticularly applicable to grouting,patching,and form-fillingoperations where the objective is to completely fill a cavity orother defined space with a freshly mixed cementitious mixturethat will continue to fill the same space at time of hardening.Itwould be appropriate to use this test method as a basis forprescribing mixtures having restricted or specified volumechange before the mixture becomes hard.4.2 This test method can be used for
