第32卷第2期2009年2月

重庆大学学报

JournalofChongqingUniversity

Vol.32No.2Feb.2009

　　文章编号:1000

2582X(2009)0220158205

海洋环境下硅灰混凝土的抗冻性与氯离子扩散性

杨文武1a,2,钱觉时1,黄煜镔1b

(1.重庆大学a.材料科学与工程学院,b.土木工程学院,重庆400030;

2.大连民族学院土木建筑工程学院,辽宁大连116600)

摘　要:针对海洋环境条件,重点研究了硅灰混凝土的抗冻性和氯离子扩散性能的关系。试验分析了水胶比、硅灰等量替代水泥掺量大小、的影响,并与普通混凝土进行了对比。结果表明,土的抗氯离子渗透性;硅灰只有与引气剂共同使用,性能;硅灰掺量在10%。为评———冻渗比(R值方法),并进行了试验验证。

;氯离子扩散;评价方法　　:01文献标志码:A

Frostresistanceandchlorideiondiffusionofsilica2fume

concreteinamarineenvironment

YANGWen2wu1a,2,QIANJue2shi1,HUANGYu2bin1b

(1a.CollegeofMaterialsScienceandEngineering;b.CollegeofCivilEngineering,ChongqingUniversity,

Chongqing400030,P.R.China;2.CollegeofCivilEngineeringandArchitecture,

DalianNationalitiesUniversity,Dalian116600,P.R.China)

Abstract:Thepropertiesofsilicafumeconcreteinnaturalseawaterarestudied,withspecialfocusontherelationshipbetweenthefreeze2thawdurabilityandchlorideiondiffusioncoefficients.Theinfluenceofvariousfactorsonconcreteresistancetofrostandchloridediffusionisstudied,includingthewater2cementratio,equivalentsilicafumedosagesubstitutionforcement,andtheamountofair2entrainingagentandcomparedwiththatofordinaryconcrete.Theresultsshowthataddingsilicafumecannotimprovethefrostresistanceofconcretebutitincreasesresistancetochloridediffusion.Boththefrostresistanceandchloridediffusionpropertiescanbeimprovedsimultaneouslywhensilicafumeisusedwithanair2entrainingagent.Asilicafumecontentofapproximately10%istheoptimumvalueforthecompositeresistancetofrostand

chloridediffusion.Anewassessmentmethod(R2valuemethod)isproposedto

evaluatethecompositepropertiesoffrostresistanceandchloridediffusionofmarineconcrete.

Keywords:silica2fumeconcrete;frostresistance;chloridediffusion;assessmentmethod