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Analytical Solution for the Chloride Diffusivity of Hardened Cement Paste

Analytical Solution for the Chloride Diffusivity of Hardened Cement Paste

ID：40562302

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页数：8页

时间：2019-08-04

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1、AnalyticalSolutionfortheChlorideDiffusivityofHardenedCementPaste12JianjunZhengandXinzhuZhouAbstract:Duetoitsimportancetothedurabilityassessmentanddesignofreinforcedconcretestructureslocatedinamarineordeicingsaltenvironment,itisessentialtodeterminethechloridediffusivityo

2、fhardenedcementpaste.Thispaperpresentsananalyticalsolutionforthechloridediffusivityofhardenedcementpaste.Bymodelinghardenedcementpasteasatwo-phasecompositematerial,composedofgelandcapillaryporesandsolidcementgel,ananalyticalsolutionisderivedforthechloridediffusivityofha

3、rdenedcementpastebasedonthegeneraleffectivemediumtheory.Aparameterinvolvedintheanalyticalsolutionisthendeterminedbyexperimentalcalibration.Afterverifyingtheanalyticalsolutionwithexperimentalresultsobtainedfromtheliterature,theeffectsofthewater/cementratioandthedegreeofh

4、ydrationonthechloridediffusivityofhardenedcementpasteareevaluatedinaquantitativemanner.Itisfoundthatthechloridediffusivityofhardenedcementpastewithawater/cementratioof0.7isthreeordersofmagnitudelargerthanthatwithawater/cementratioof0.3andthattheextenttowhichthedegreeofh

5、ydrationinßuencesthechloridediffusivityofhardenedcementpasteisintherangeof50to80%whenthedegreeofhydrationvariesfrom0.5to1.0.Thepaperconcludesthattheanalyticalsolutionpresentedinthepapercanpredictthechloridediffusivityofhardenedcementpastewithreasonableaccuracy.DOI:10.10

6、61/ASCE0899-1561200820:5384CEDatabasesubjectheadings:Chlorides;Diffusion;Porosity;Durability;Cements.Introductiontionsystemsforpreventingthisdeteriorationfocusonpreventingchlorideionsfromreachingtheembeddedsteel.SincechlorideIthaswidelybeenrecognizedthatcorrosiono

7、freinforcingsteelionsarerequiredtomovefromthesurfaceoftheconcretetotheinconcreteisapredominantcausalfactorintheprematuredete-surfaceofthesteelbarandtoaccumulatetosufÞcientquantityriorationofreinforcedconcreteRCstructureslocatedinabeforecorrosioninduceddeteriorationoft

8、heRCstructuretakesmarineordeicingsaltenvironmentSumranwanichandTang-places,itisthechloridediffusivitythatcont

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