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Reviewondamagemechanism andinfluencefactorsofAlkali - SilicaReaction
1,2
SUHuaizhi ,YANGLifu 1,2
(1.StateKeyLaboratoryofHydrology - WaterResourcesandHydraulicEngineering,HohaiUniversity,Nanjing 210098,China;
2.CollegeofWaterConservancyandHydropowerEngineering,HohaiUniversity,Nanjing 210098,China)
Abstract:Alkali - SilicaReaction(ASR)isakindofcomplicatedphysicalandchemicalreactioninconcrete.Its
reactionprocesscanbesimplifiedtoalkaliionsinporesolutionandreactivecomponentsinaggregatetogenerategel
productsinthewetcondition.TheoccurrenceoftheASR productcancausethedeteriorationofconcrete ,
includingdeformation,crackingandstrengthlossofmaterial,andevenposeathreattothestructuralhealthand
safeoperationofstructures.Astheamountofnonreactiveaggregatesreducesandnoveltypesofconcreteemerge ,it
isworthpayingmoreattentiontoASRanditspotentialdamage.ThedamageexamplescausedbyASRwerelisted.
TheoverviewontheASRmechanismwasreviewedinthispaper.Twocontroversialassumptionsabouttheexpansion
mechanismduetoASR,waterimbibitionandosmoticpressure,andtheirlatestresearchprogresswerediscussed.
Theeffectsofaggregatecharacteristics(internal)andenvironmentalfactors(external)onthedevelopmentofASR
werereviewedcomprehensively ,includingreactivityofaggregate,aggregatesize,aggregatedistribution,curing
temperatureandrelativehumidity.ToimprovethecomprehensivediagnosticmethodofASRandevaluationstandard
ofASRdamage ,thequestionstobefurtherstudiedaboutthedamagemechanismandtheinfluencefactorsofASR
wereraised.
Keywords:concrete;Alkali - SilicaReaction(ASR);damagemechanism;reactiondevelopment;aggregate;
temperature;relativehumidity
(责任编辑:韩 昆)
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