Page 161 - 《水资源与水工程学报》2023年第2期
P. 161

!34 " ! 2 #                       & ' ( ) & * + , -                               Vol.34No.2
               2023 $ 4 %               JournalofWaterResources&WaterEngineering                 Apr.,2023

            DOI:10.11705/j.issn.1672-643X.2023.02.20


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                 GHIJK:TU528   LMNOP:A    LQRK:1672643X(2023)02015706

                            Chlorideiontransportinaeoliansandconcreteunder
                                        carbonizationanddry -wetcycle

                                                                             1
                                            1
                          1,2
                                                                                                         1
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                DONGWei ,ZHOUMenghu,WANGXuesong,HANGMeiyan,XUEGang,WANGDong
            (1.CollegeofCivilEngineering,InnerMongoliaUniversityofScienceandTechnology,Baotou014010,China;2.InnerMongoliaAutonomous
                RegionEngineeringTechnologyResearchCenterofBuildingStructureDisasterPreventionandMitigation ,Baotou014010,China)
                 Abstract:AlargenumberofsaltlakesdistributesinnorthwestChina,anddeicingsaltiswidelyusedin
                 winter ,sothegas-liquidexchangeareaoftheprojectsinthisareaisoftensubjectedtothedualeffects
                 ofdry-wetcycleandcarbonization ,whichmakestheaffectedconcretemorepronetoreinforcementcor
                 rosionthanthatingeneralenvironment.Inordertoinvestigatethetransportlawofchlorideionsinaeoli
                 ansandconcreteundercarbonizationanddry-wetcycle ,chlorideioncorrosionexperimentswerecarried
                 outtoanalyzethecontentanddistributionlawoffreechlorideions ,thediffusioncoefficientofchloridei
                 onsandtherelationshipbetweentimedependenceandcarbonationtime.Theresultsshowedthatcarbona
                 tionhinderedthetransportspeedofchlorideionstotheinnerpartoftheconcrete,thelongerthecarbona
                 tiontimewas ,thelowerthechloridediffusioncoefficientbecame,sothecarbonizationplayedapositive
                 roleintheresistanceofchlorideioncorrosion.Intheearlystageofthedry-wetcycle ,thechlorideion
                 intrusionwasaccelerated ;theninthemiddleandlatestages,thesaltcrystalsformedintheporesfilled
                 upthespaceinthepores ,whichincreasedthedensityoftheconcreteandpreventedtheinwardintrusion
                 ofchlorideions.However ,thecrackscausedbythecrystalstressincreasedthechlorideioncontentin
                 thesurfacelayer.
                 Keywords:aeoliansandconcrete;carbonization;dry-wetcycle;freechlorideioncontent;chloride
                 iondiffusioncoefficient;timedependence

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