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25120092StructuralEngineersVol.25,No.1Feb.2009:2008-11-16:(863)(2006AA04Z415)(,200092),,,,,,,,,AcceleratedCorrosionTechniqueforReinforcementSteelBarsinConcreteZENGYanhongGUXianglinZHANGWeipingHUANGQinghua(DepartmentofBuildingEngineering,TongjiUniversity,Shanghai200092,China)AbstractAcceleratedcorrosiontechniqueisanefficientwaytomakecorrodedreinforcementsteelbarsinalab.BasedonelectrochemicalcorrosionmechanismandFaradayslaw,theeffectofcurrentdensity,connectionmethods,electrolyteandconstructionalmeasuresonthecorrosionresultofsteelbarsisdiscussedinthepaper.Itwasverifiedthattheseriescircuitandtheparallelcircuithavethesameactiononthecorrosionprocessofsteelbars.Itwasalsoverifiedbythetestresultsthatthemeasuredcorrosionrateshavegoodmatchwiththosetheoreticallycalculatedwhenthesurfaceofsteelbarsiscloselyconnectedwithelectrolyte,andchangeofcurrentdensityhaslittleeffectonthecorrosionrateofsteelbars,thatis,themeasuredcorrosionratescanbepreciselyestimatedbasedonFaradayslaw.KeywordsFaradayslaw,acceleratedcorrosion,reinforcement,concrete1,,,,,:[1];[2];[3];[4],[6-10],21,,,,,,,:H2O\H++OH-,,OH-,H+,,,:FeFe2++2e-,:2H++2e-H2,,,,,,[2]:4OH-O2+2H2O+4e-Cl-,,,,1Fig.1Acceleratedcorrosionmechanismofreinforcementsteelbarsinconcrete3:[5],,,(1)m=MItZF(1),m(g);M(56g/mol);I(A),;t(s);Z,,,Z2;F,1,F=Ne,N,1,6.021023mol-1,e1.6010-19C:I=is=idl(2),i(A/cm2);d(cm);l(cm),(3)=mm(3)m=r2l(2)(3)=mm=MidltZFr2l=MitFr(4),r(cm);(7.8g/cm3),,,,,44.1,,45A/cm23000A/cm2Tamer[6]100A/cm2500A/cm2,5%,,,50100A/cm2[7],,300A/cm2,201StructuralEngineersVol.25,No.1ExperimentStudy4.2,,,,,,,,14mmC20,150mm150mm150mm,84mm,,23,2Fig.2Seriescircuit3Fig.3Parallelcircuit,V=8.91V,I1=46.7mA,I2=38.2mA,I3=29.0mA,I4=20.6mA,I5=6.7mA,,A1A5:A1=I1-I2=8.4mA,A2=I2-I3=9.3mA,A3=I3-4=8.3mA,A4=I4-I5=14.0mA,A5=I5=6.7mA,,,V=8.94V,I1=46.7mA:I2=8.4mA,I3=9.3mA,I4=8.3mA,I5=14.0mA,I6=6.7mA,,,A1=I2,A2=I3,A3=I4,A4=I5,A5=I6,,,,,,,,,,,,,,,4.3,,,,Cl-,,NaCl3%5%NaClCl-,,301251,,Cl-,,,,10%;,40%120%[8]4.4,,,,,,,,,,,5[4,9,10],,,11Table1Existingcorrosionresults/mm/(Acm-2)/%/h/%()/1[4]C301410000510921.530.3061021923.160.3161532924.960.332043827.410.3725548210.080.40330658213.420.4472[9]C3014200101296176.850.6852025926411.050.553038882024.620.823[10]C4012200557232.530.50610114434.540.45415169537.360.49202288310.940.547303432315.510.5174C4015.2mm200()5240122.480.496104801210.271.02715720611.800.7820960514.020.701251200412.450.498301440613.080.4361,,50%,,,,OH-,,,,,,,1,,,,401StructuralEngineersVol.25,No.1ExperimentStudy,,,5.2mm,400mm,,5%NaCl,4,,3,24Fig.4Acceleratedcorrosiondevice2Table2Detailsoftestspecimensandcorrosionresults/(Acm-2)/h/%/%/Y112254766.321.05Y2245023.566.001Y32450471212.461.04,,(0.1mm),(0.01g)2,,,,6,,,,[1],,.[J].,2000,30(1):43246.[2],.[C].,2000,10:1122118.[3],,.-[J].,2006,34(5):5862592.[4].[D].:,2008.[5],,.[M].2.:,2005.[6]TamerA,KhaledA.EffectivenessofImpressedCurrentTechniquetoSimulateCorrosionofSteelReinforcementinConcrete[J].JournalofMaterialsinCivilEngineering,2003,15(1):41247.[7],.[J].,2005,30(5):629.[8],.[J].,2005,(1):427.[9].[D].:,2008.[10].[D].:,2007.501251