1、Designation:C823/C823M12Standard Practice forExamination and Sampling of HardenedConcrete in Constructions1This standard is issued under the fixed designation C823/C823M;the number immediately following the designation indicates the yearof original adoption or,in the case of revision,the year of las
2、t 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.Scope1.1 This practice outlines procedures for visual examinationand sampling of hardened concrete in constructions.Referenceis made t
3、o the examination and sampling of concrete inprefabricated building units,precast products,and laboratoryspecimens.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 exact equivalents;therefore,eachsystem s
4、hall 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 user of this standard to establish appro-p
5、riate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2C42/C42M Test Method for Obtaining and Testing DrilledCores and Sawed Beams of ConcreteC125 Terminology Relating to Concrete and Concrete Ag-gregatesC21
6、5 TestMethodforFundamentalTransverse,Longitudinal,and Torsional Resonant Frequencies ofConcrete SpecimensC295 Guide for Petrographic Examination ofAggregates forConcreteC457 Test Method for Microscopical Determination of Pa-rameters of the Air-Void System in Hardened ConcreteC597 Test Method for Pul
7、se Velocity Through ConcreteC670 Practice for Preparing Precision and Bias Statementsfor Test Methods for Construction MaterialsC856 Practice for Petrographic Examination of HardenedConcreteE105 Practice for Probability Sampling of MaterialsE122 Practice for Calculating Sample Size to Estimate,WithS
8、pecified Precision,the Average for a Characteristic of aLot or ProcessE141 Practice for Acceptance of Evidence Based on theResults of Probability Sampling3.Terminology3.1 DefinitionsFor definitions of terms used in thispractice,refer to Terminology C125.3.2 Definitions of Terms Specific to This Stan
9、dard:3.2.1 concrete constructions,nany object,unit,or struc-ture that has been built of hydraulic cement concrete.3.2.2 category of concrete,na specified level of quality inconcrete that is observed to be in a definable range of conditionas a result of service or test exposure,as distinguished fromc
10、oncrete in the same or related constructions that is either ofdiffering specified quality or of the same specified quality butin observably different condition at the time of examination.Itis also used to refer to concrete having a certain attribute orattributes.(see the Sampling Plan Section).4.Sig
11、nificance and Use4.1 The examination may provide a basis for laying out insitu testing of the concrete.4.2 The sampling can provide materials for petrographicexamination,in accordance with Practice C856,chemical orphysical analytical procedures,or any of a wide variety ofdestructive or nondestructiv
12、e tests to determine physical,mechanical,or structural properties of the concrete.4.3 The results of examination and sampling carried out inaccordance with this practice may be used for a variety ofpurposes and to serve a variety of objectives,some of whichare discussed in the Procedural Plan Sectio
13、n.5.Qualifications and Instruction of Personnel5.1 QualificationsThe examination,formulation of sam-pling plan,and the sampling procedures shall be performed by1This practice is under the jurisdiction of ASTM Committee C09 on Concreteand Concrete Aggregates,and is the direct responsibility of Subcom
14、mittee C09.65on Petrography.Current edition approved April 1,2012.Published April 2012.Originallyapproved in 1975.Last previous edition approved in 2007 as C82307.DOI:10.1520/C0823_C0823M-12.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at service
15、astm.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 International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1
16、persons qualified by education and experience to carry out suchwork,to operate equipment employed,to record and interpretobservations,and to report upon the sampling plan and itsexecution.Technicians and workmen may be required to assistin the operations but appropriate training and supervision aremandatory.5.2 Instruction of PersonnelThis practice may be used bypersonnel employed directly by those for whom the examina-tion and sampling program are conducted.The employershould tell the personnel
