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1、ChinaOceanEngineering,Vol.23,No.4,pp.719-728Z2009ChineseOceanEngineeringSociety,ISSN0890-5487AnalyticalMethodsforPredictionofWaterAbsorptioninCemen-tBasedMaterial*1WANGL-icheng(王立成)StateKeyLaboratoryofCoastalandOffshoreEngineering,DalianUniversityofTechnology
2、,Dalian116024,China(Received9September2008;receivedrevisedform5May2009;accepted24August2009)ABSTRACTThecapillaryabsorptionofwaterbyunsaturatedcemen-tbasedmaterialisthemainreasonofdegradationofthestructuressubjectedtoanaggressiveenvironmentsincewateroftenactsa
3、sthetransportingmediumfordamagingcontam-inants.Itiswellknownthatthecapillaritycoefficientandsorptivityaretwoimportantparameterstocharacterizethewaterabsorptionofporousmaterials.Generally,theformerisusedtodescribethepenetrationdepthorheightofwatertrans-port,wh
4、ichmustbemeasuredbyspecialandadvancedequipment.Incontrast,thesorptivityrepresentstherelationshipbetweencumulativevolumeofwateruptakeandthesquarerootoftheelapsedtime,whichcanbeeasilymeasuredbythegravimetricmethodinanormallaboratorycondition.Inthepresentstudy,a
5、nanalyticalmethodisdevelopedtobuildupabridgebetweenthesetwoparameters,withthepurposethatthesorptivityorthegravimetricmethodcanbeusedtopre-dictthepenetrationdepthofwaterabsorption.Additionally,anewmodeltoexplainthedependenceofsorptivityoninitialwatercontentoft
6、hematerialisdevelopedinordertofittheinsitucondition.Thecomparisonofpredictedresultsbytheanalyticalmethodwithexperimentaldataornumericalcalculationresults,aswellassomepreviousmodels,validatesthefeasibilityofthemethodspresentedinthispaper.Keywords:waterabsorpti
7、on;capillaritycoefficient;sorptivity;cement-basedmaterial;initialwatercontent1.IntroductionThecemen-tbasedmaterials,suchasthemortarandconcrete,areoftensubjectedtodeteriorationprocessesinwhichwaterusuallyactsastheprincipalmediumtotransmitaggressiveagents(e.g.c
8、hlo-rideorsulfateions)(Yangetal.,2006).Itistypicalforthestructuresthataresubjectedtorepeatedwettinganddryingregimes,forexample,thetidalzoneofmarinestructures,fluctuatinggroundwater,exteri
