直接影响钢筋腐蚀的可溶氯离子.docx

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1、Figure 7 showsthemeasurementresu1tsofso1ub1ech1orideioncontentthatdirect1yaffectthecorrosionofrebar.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。Forso1ub1ech1orideioncontentwithinIcmdepthinconcretefromsurface,theva1ueforconcretewithCA1isthea1mostsameasforOPCconcrete.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,thech1oridecontentsina11concreteswithCA2arec1ear1y1essthanofOPCconcrete.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。Theseresu1tsindicatethattheconcretesmixedwithCA2arec1ear1ysuperiorinimmobi1izationabi1ityofch1orideioncomparedtotheOPC.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。Tab1e3sh

3、owstheimmobi1izationabi1ityofch1orideioninbothconcreteswith7%ofCA2andwithOPCon1yexposedtotwodifferentmarineenvironments,suchastida1zoneandsubmersionzone.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,theconcretesarea1soinitia11ycuredunderthedifferentconditions,suchaswatercuringfor7da

4、ys,samefor28days,andon1yinatmospherefor28days.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,inspiteoftheinitia1curingmethod,ch1orideionsignificant1ypenetratesupto2cmdepthinconcrete.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,thech1orideionconten

5、tinCA2concretesisc1ear1y1essthanofOPCones.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,thediffusioncoefficientoftheCA2concretesexposedtotida1zoneshowsa1mostthesameva1ueregard1essofthecuringmethod,thoughinthecaseofOPCconcrete,thecoefficientofconcretecuredinitia11yunderairisc1ear1ythe1argest.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。Theamountofch1orideionatdepthof3cminOPCconcreteis1argercomparedtoCA2concrete,regard1essofdifferenceintheinitia1curingmethod.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,1ookingattheeffectsduetodifferencesinexposu

7、reenvironment,bothCA2concretesandOPConesexposedtosubmersionzonehavehigherdiffusioncoefficientthanthoseconcretesattida1zone.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。10028days28days(Submersion)(Tida1)7daysAircuring；28days28days(TidaD(Tida1)(Submersion)(Tida1)7daysrcuring(TidaI)(TidaDExpos

8、ureFigure8.Tota1ch1oridecontentandch1oridediffusioncoefficient(after:yearofexposuretest)3020SpecimencodeCuringmethodBcposureenvironmentTota1ch1orideion(kgm1)Ch1oridediffusion(cm2year)0.25Deothfromsurface(cm)5.01.0203.04.028daysSubmersionzone8.7215.25035281.0270.1220.0541924CPr28daysTida1zone10.27.23

9、334320.8190.3220.26717347daysTk1a1zone11.1255.54726710.4570.0800.0851041AirCiJnngTida1zone8.8585.63237511.2160.1660.034208128daysSubmersionzone13.3977.44313140.2200.1530.3630788CA2-728daysTida1zone12.1385.26909060.1420.2220.24205687dysHda1zone21.4547.69813300.2700.3110.2090442AircuringTk1a1zone15,20

10、6553905000.2330.2730.2600442Tab1e3.Tota1ch1oridecontentandch1oridediffusioncoefficient(after1yearofexposuretest)Figure 8 40Figure 9 showsaratiobetweenimmobi1izedch1orideionandso1ub1ech1orideoneineachCOnCrete.图8显示了混凝土中固化氯离子和可溶氯离子的比例。Here,theamountofimmobi1izedch1orideionisestimatedasthedifferenceinth

11、eamountoftota1ch1orideionandtheoneofso1ub1ech1orideion.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%ofCA2exposedtotida1zone,thetota1ch1orideionseemstobere1ative1yhighercomparedtoOPC.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。Theamountofimmobi1izedch1orideion,whichisexpressedasapercentageoftota1c

12、h1oride,isapproximate1y42%forconcreteinitia11ycuredunderwaterfor28days,43%forconcreteinitia11ycuredunderwaterfor7days,and44%forconcreteinitia11ycuredunderair.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%。A1so,inthecaseofconcreteexposedtosubmersedzone,whichiscuredinitia11yinwaterf

13、or28days,theimmobi1izedch1oridepercentageis41%andisa1mostthesameasoftheconcreteexposedtotida1zone.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。Fromtheresu1tsmentionedabove,itisc1earthattheabi1itytoimmobi1izech1orideionbyCA2inconcretecanbeshownasa1mostthesameregard1essofthedifferenceininitia1curingmethodsa

14、ndexposureCOndition.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,inthecaseofOPCconcretesexposedtotida1zone,significantdifferenceisnotidentifiedinthetota1amountofch1orideionforeachconcrete.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,withrespecttoimmobi1izationrate,somedifferencearisesasf

15、o11ows;然而，对于氯离子固化率而言，差别如下：(1) forconcreteinitia11ycuredinwaterfor28daysandthenexposedintida1zone,theimmobi1izationrateis35%,(I)初期水养28天后暴露在潮汐环境下的固化率为35%(2) forconcreteinitia11ycuredinwaterfor7daysandthenexposedtotida1zone,theimmobi1izationrateis16%,(2)初期水养7天后暴露在潮汐环境下的固化率为16%(3) forconcreteinitia11ycuredinairfor7days,andthenexposedtotida1zone,theimmobi1izationrateis16%.(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,therateofimmobi1izationis24%,approximate1y10%1owerthanthoseexp