1、Designation:C87615Standard Test Method forCorrosion Potentials of Uncoated Reinforcing Steel inConcrete1This standard is issued under the fixed designation C876;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revisio
2、n.A number 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 estimation of the electricalcorrosion potential of uncoated reinforcing steel in field andlaboratory concre
3、te,for the purpose of determining the corro-sion activity of the reinforcing steel.1.2 This test method is limited by electrical circuitry.Concrete surface in building interiors and desert environmentslose sufficient moisture so that the concrete resistivity becomesso high that special testing techn
4、iques not covered in this testmethod may be required(see 5.1.4.1).Concrete surfaces thatare coated or treated with sealers may not provide an accept-able electrical circuit.The basic configuration of the electricalcircuit is shown in Fig.1.1.3 The values stated in inch-pound units are to be regarded
5、as standard.The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.1.4 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
6、 standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2E691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test MethodG3 Practice for Convention
7、s Applicable to ElectrochemicalMeasurements in Corrosion TestingG15 Terminology Relating to Corrosion and Corrosion Test-ing(Withdrawn 2010)3G16 Guide for Applying Statistics to Analysis of CorrosionData3.Terminology3.1 For definitions of terms used in this test method,refer toTerminology G15.4.Sign
8、ificance and Use4.1 This test method is suitable for in-service evaluation andfor use in research and development work.4.2 This test method is applicable to members regardless oftheir size or the depth of concrete cover over the reinforcingsteel.Concrete cover in excess of 3 in.(75 mm)can result ina
9、n averaging of adjacent reinforcement corrosion potentialsthat can result in a loss of the ability to discriminate variationin relative corrosion activity.4.3 This test method may be used at any time during the lifeof a concrete member.4.4 The results obtained by the use of this test method shallnot
10、 be considered as a means for estimating the structuralproperties of the steel or of the reinforced concrete member.4.5 The potential measurements should be interpreted byengineers or technical specialists experienced in the fields ofconcrete materials and corrosion testing.It is often necessary tou
11、se other data such as chloride contents,depth of carbonation,delamination survey findings,rate of corrosion results,andenvironmental exposure conditions,in addition to corrosionpotential measurements,to formulate conclusions concerningcorrosion activity of embedded steel and its probable effect onth
12、e service life of a structure.5.Apparatus5.1 The testing apparatus consists of the following:5.1.1 Reference Electrode:5.1.1.1 The reference electrode selected shall provide astable and reproducible potential for the measurement of the1This test method is under the jurisdiction of ASTM Committee G01
13、 onCorrosion of Metalsand is the direct responsibility of Subcommittee G01.14 onCorrosion of Metals in Construction Materials.Current edition approved Nov.1,2015.Published April 2016.Originallyapproved in 1977.Last previous edition approved in 2009 as C87609.DOI:10.1520/C0876-15.2For referenced ASTM
14、 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 standards Document Summary page onthe ASTM website.3The last approved version of this historical standard is referenced onwww.astm.org.Co
15、pyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 corrosion potential of reinforcing steel embedded in concreteover the temperature range from 32 to 120F(0 to 49C).5.1.1.2 For the purposes of this standard,corrosion poten-tials shall be based
16、 upon the half-cell reaction Cu Cu+2e-corresponding to the potential of the saturated copper-copper sulfate reference electrode as referenced to the hydro-gen electrode being 0.30 V at 72F(22.2C).4The copper-copper sulfate reference electrode has a temperature coefficientof approximately 0.0005 V more negative per F for thetemperature range from 32 to 120F(0 to 49C).5.1.1.3 Other reference electrodes having similar measure-ment range,accuracy,and precision characteristics to thecopper-copper sul