1、Designation:C176012Standard Test Method forBulk Electrical Conductivity of Hardened Concrete1This standard is issued under the fixed designation C1760;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number
2、 in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method covers the determination of the bulkelectrical conductivity of saturated specimens of hardenedconcrete to provide a rapid indica
3、tion of the concretesresistance to the penetration of chloride ions by diffusion(SeeNote 1).The results of this test method can be related to theapparent chloride diffusion coefficient that is determined usingTest Method C1556.NOTE1The term“bulk”is used because the electrical conductivity isdetermin
4、ed by measuring the current passing through all the phases of atest specimen(e.g.,cement paste,sand,aggregate).This is accomplishedusing electrodes that cover the ends of the specimen.Other test methodsthat measure conductivity may use probes placed on the side surface of thespecimen.1.2 UnitsThe va
5、lues stated in SI units are to be regardedas standard.No other units of measurement are included in thisstandard.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-priate safet
6、y and health practices and determine the applica-bility of regulatory limitations prior to use.(WarningFreshhydraulic cementitious mixtures are caustic and may causechemical burns to exposed skin and tissue upon prolongedexposure.2)2.Referenced Documents2.1 ASTM Standards:3C31/C31M Practice for Maki
7、ng and Curing Concrete TestSpecimens in the FieldC42/C42M Test Method for Obtaining and Testing DrilledCores and Sawed Beams of ConcreteC125 Terminology Relating to Concrete and Concrete Ag-gregatesC192/C192M Practice for Making and Curing Concrete TestSpecimens in the LaboratoryC511 Specification f
8、or Mixing Rooms,Moist Cabinets,Moist Rooms,and Water Storage Tanks Used in theTesting of Hydraulic Cements and ConcretesC1202 Test Method for Electrical Indication of ConcretesAbility to Resist Chloride Ion PenetrationC1543 Test Method for Determining the Penetration ofChloride Ion into Concrete by
9、PondingC1556 Test Method for Determining the Apparent ChlorideDiffusion Coefficient of Cementitious Mixtures by BulkDiffusion3.Terminology3.1 Definitions:3.1.1 For definitions of terms used in this test method,referto Terminology C125.4.Summary of Test Method4.1 This test method measures the electri
10、cal current througha saturated concrete specimen with a potential difference of 60V dc maintained across the ends of the specimen.Testspecimens can be 100 mm diameter by 200 mm long moldedcylinders or nominal 100 diameter cores with length rangingfrom 100 to 200 mm.The apparatus and specimen conditi
11、oningprocedures are the same as described in Test Method C1202,except that the side of the specimen does not have to be sealed.The current is measured 1 min after the voltage is first applied.The measured current,the applied voltage,and the specimendimensions are used to calculate the bulk electrica
12、l conductiv-ity of the concrete.5.Significance and Use5.1 This test method measures the bulk electrical conduc-tivity of concrete,which has a theoretical relationship to thediffusion coefficient of chloride ion,or other ions,in theconcrete(1,2).4Experimental data confirm that there is acorrelation b
13、etween the apparent chloride diffusion coefficientmeasured by Test Method C1556,or similar method,and thebulk electrical conductivity(3,4).1This test method is under the jurisdiction of ASTM Committee C09 onConcrete and Concrete Aggregates and is the direct responsibility of SubcommitteeC09.66 on Co
14、ncretes Resistance to Fluid Penetration.Current edition approved Jan.1,2012.Published February 2012.DOI:10.1520/C1760-12.2See section on Safety Precautions,Manual of Aggregate and Concrete Testing,Annual Book of ASTM Standards,Vol.04.02.3For referenced ASTM standards,visit the ASTM website,www.astm.
15、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.4The boldface numbers in parentheses refer to a list of references at the end ofthis standard.Copyright ASTM International,100 Ba
16、rr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 5.2 A number of factors are known to affect electricalconductivity of concrete:water cementitious materials ratio,the type and amount of supplementary cementitious materials,presence of polymeric admixtures,admixtures that containsoluble salts,specimen age,air-void system,aggregate type,degree of consolidation,degree of saturation,and type ofcuring.Different curing methods are used in this test methoddepending on whether
