直接影响钢筋腐蚀的可溶氯离子.docx

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1、Figure 7 showsthemeasurementresultsofsolublechlorideioncontentthatdirectlyaffectthecorrosionofrebar.图7所示为直接影响钢筋腐蚀的可溶氯离子含量的测试结果。ForsolublechlorideioncontentwithinIcmdepthinconcretefromsurface,thevalueforconcretewithCAlisthealmostsameasforOPCconcrete.在距离试件表面Icm以内的可溶氯离子含量，CA?和OPC混凝土是一样的。However,atthede

2、pthmorethanIcmfromthesurface,thechloridecontentsinallconcreteswithCA2areclearlylessthanofOPCconcrete.然而，距离试件表面ICm以外，CA2混凝土中的氯离子按量明显比OPC混凝土少。TheseresultsindicatethattheconcretesmixedwithCA2areclearlysuperiorinimmobilizationabilityofchlorideioncomparedtotheOPC.这些结果表明含CA2的混凝土固化氯离子的能力明显比OPC混凝土好。Table3sh

3、owstheimmobilizationabilityofchlorideioninbothconcreteswith7%ofCA2andwithOPConlyexposedtotwodifferentmarineenvironments,suchastidalzoneandsubmersionzone.表3显示了含7%CA2和OPC的两种混凝土固化氯离子的能力，这两种混凝土只暴露在两种海洋环境中，如潮汐环境和浸没区。Here,theconcretesarealsoinitiallycuredunderthedifferentconditions,suchaswatercuringfor7da

4、ys,samefor28days,andonlyinatmospherefor28days.这里，混凝土最初也在不同环境下养护，如在水中养护7天，以相同的方法养护28天或者在空气中养护28天。Inconcretewith7%ofCA2,inspiteoftheinitialcuringmethod,chlorideionsignificantlypenetratesupto2cmdepthinconcrete.在含7%CA2的混凝土中，虽然在最初的养护条件下，氯离子的最大渗透距离已达2cmoHowever,atthe2cmordeeperportion,thechlorideionconten

5、tinCA2concretesisclearlylessthanofOPCones.然而，在2cm或者更深的部分，CA2混凝土中氯离子含量明显比OPC混凝土中少。Furthermore,thediffusioncoefficientoftheCA2concretesexposedtotidalzoneshowsalmostthesamevalueregardlessofthecuringmethod,thoughinthecaseofOPCconcrete,thecoefficientofconcretecuredinitiallyunderairisclearlythelargest.此外，

6、暴露在潮汐环境下的CA?混凝土不论在什么养护条件下的扩散系数几乎都一样，即使是OPC混凝土，最初在空气中养护的试件的扩散系数明显是最大的。Theamountofchlorideionatdepthof3cminOPCconcreteislargercomparedtoCA2concrete,regardlessofdifferenceintheinitialcuringmethod.在不计初始养护方法的条件下，与CA2混凝土相比，OpC混凝土在距混凝土试件表面3cm深处的氯离子含量更高，Inaddition,lookingattheeffectsduetodifferencesinexposu

7、reenvironment,bothCA2concretesandOPConesexposedtosubmersionzonehavehigherdiffusioncoefficientthanthoseconcretesattidalzone.此外，就在不同暴露环境下的效果而言，CA?混凝土和OPC混凝土暴露在浸没环境下的扩散系数比在潮汐环境下的高。100 28days28days(Submersion)(Tidal)7daysAircuring ； 28days28days(TidaD(Tidal) (Submersion) (Tidal)7daysr curing(TidaI) (Tid

8、aDExposureFigure 8. Total chloride content and chloride diffusion coefficient (after: year of exposure test)3020SpecimencodeCuringmethodBcposureenvironmentTotalchlorideion(kgm1)Chloridediffusion(cm2year)0.25Deothfromsurface(cm)5.01.0203.04.028daysSubmersionzone8.7215.25035281.0270.1220.0541924CPr28d

9、aysTidalzone10.27.23334320.8190.3220.26717347daysTklalzone11.1255.54726710.4570.0800.0851041AirCiJnngTidalzone8.8585.63237511.2160.1660.034208128daysSubmersionzone13.3977.44313140.2200.1530.3630788CA2-728daysTidalzone12.1385.26909060.1420.2220.24205687dysHdalzone21.4547.69813300.2700.3110.2090442Air

10、curingTklalzone15,206553905000.2330.2730.2600442Table3.Totalchloridecontentandchloridediffusioncoefficient(after1yearofexposuretest)40Figure 8 showsaratiobetweenimmobilizedchlorideionandsolublechlorideoneineachCOnCrete.图8显示了混凝土中固化氯离子和可溶氯离子的比例。Here,theamountofimmobilizedchlorideionisestimatedasthedif

11、ferenceintheamountoftotalchlorideionandtheoneofsolublechlorideion.在这里，认为总氯离子的量与可溶性氯离子的量之差为固化氯离子的量。Intheconcretewith7%ofCA2exposedtotidalzone,thetotalchlorideionseemstoberelativelyhighercomparedtoOPC.暴露在潮汐环境时，与OPC混凝土相比，含7%CA2的混凝土中总氯离子含量相对较高。Theamountofimmobilizedchlorideion,whichisexpressedasapercent

12、ageoftotalchloride,isapproximately42%forconcreteinitiallycuredunderwaterfor28days,43%forconcreteinitiallycuredunderwaterfor7days,and44%forconcreteinitiallycuredunderair.将固化氯离子的量表示为总氯离子含量的百分比形式时，清水养护28天时含量大约为42%,清水养护7天时为43%,在空气中养护时为44%。Also,inthecaseofconcreteexposedtosubmersedzone,whichiscuredinitia

13、llyinwaterfor28days,theimmobilizedchloridepercentageis41%andisalmostthesameasoftheconcreteexposedtotidalzone.同样的，在淹没区时，水养28天时固化氯离子的量为41%,几乎与潮汐环境下相同。Fromtheresultsmentionedabove,itisclearthattheabilitytoimmobilizechlorideionbyCA2inconcretecanbeshownasalmostthesameregardlessofthedifferenceininitialcur

14、ingmethodsandexposureCOndition.由以上结果看，CA2混凝土固化氯离子的能力与初始养护条件和暴露环境关系不大。Ontheotherhand,inthecaseofOPCconcretesexposedtotidalzone,significantdifferenceisnotidentifiedinthetotalamountofchlorideionforeachconcrete.另一方面，对于暴露在潮汐环境下的OPC混凝土，各混凝土中的氯离子含量也没有明显差异However,withrespecttoimmobilizationrate,somedifferen

15、cearisesasfollows;然而，对于氯离子固化率而言，差别如下：(1) forconcreteinitiallycuredinwaterfor28daysandthenexposedintidalzone,theimmobilizationrateis35%,(I)初期水养28天后暴露在潮汐环境下的固化率为35%(2) forconcreteinitiallycuredinwaterfor7daysandthenexposedtotidalzone,theimmobilizationrateis16%,(2)初期水养7天后暴露在潮汐环境下的固化率为16%(3) forconcreteinitiallycuredinairfor7days,andthenexposedtotidalzone,theimmobilizationrateis16%.(3)初期在空气中养7天后暴露在潮汐环境下的固化率为16%Inaddition,forconcreteexposedtosubmersedzoneafter28daysofwatercuring,therateofimmobilizationis24%,approximately10%lowe