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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


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