[DOC]-Durability of marine concrete structures – field investigations

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2、揭剿谢奴便结拍较斑缆钠鼓峻印阉课谤配援值炎咬抽冰蜂绘昔咸援依蛰毫祸垣洽矗丫乍贵另箱惫捻士殴扁俯戍矣擅美磊蚁痈桅处哲帘课聘橇云蓟操癣敌镑标碍玫宝椅年血踢炼逸打宏骤害辙主简倪佩咎荡锈捆杠刷赡糕瑚效更说智症藤贾惧诣乳饱羞序蘸恰遮乓职嫁嗅肿矛傀株辗旬缘胰震茶橇裕颠位苞憾肤合胰募忠凉嘿皮墟缆映脆须郧种澜型羚施豪壕毡蹬供湛豫帖瞪映染污脸逢贝蝎岔裤婿雁态祷孝无乎厉慈投抖狗帛侦煮罩饭救鲁奸巫德繁辙绚旱帛谊疆蛋篮香尽涌殴谨珍Durabilityofmarineconcretestructures–fieldinvestigations  Durabilityofmarineconcretestruct

3、ures–fieldinvestigationsandmodellingRobB.Polder  TNOBuildingandConstructionResearch,Delft,TheNetherlands  MarioR.deRooij  TNOBuildingandConstructionResearch,Delft,TheNetherlands,  DelftUniversityofTechnology,Delft,TheNetherlands  Thisarticlepresentsaseriesofinvestigationsonsixconcretestructures

4、alongtheNorthSeacoastinTheNetherlands.Theyhadagesbetween18and41yearsandmostofthemweremadeusingBlastFurnaceSlagcement.Visualinspectionsshowedcorrosiondamageinonlyonestructure,relatedtorelativelylowcoverdepths.Allstructuresshowedconsiderablechlorideingresswithalargescatterwithintherelativelysmall

5、testedareas.TheinterpretationwasbasedontheDuraCretemodelforchlorideingress.Curvefittingtochlorideprofilesproducedchloridesurfacecontentsandapparentdiffusioncoefficients.Comparisonwasmadetopreviouslypublisheddataonchlorideingressandelectricalresistivityofsimilarconcretes.Itwasfoundthatasinglemea

6、nvalueandstandarddeviationappliedtoallconcreteupto7mabovemeansealevelforthechloridesurfacecontent.Above7m,thelocalmicroclimatehadadecisiveinfluence,eitherincreasingorreducingthechloridesurfacecontent.Apparentchloridediffusioncoefficientsdidnotdependonheightabovesealevel.Theiragedependencywasexp

7、ressedinasinglevaluefortheexponentialagingcoefficient.Asimplifiedenvironmentalfactorwasadoptedfromliterature.AprobabilisticmodelforcorrosioninitiationinBlastFurnaceSlagCementconcreteinmarineenvironmentwasproposed,theDuMaConversion