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干湿循环作用下喷射混凝土抗硫酸盐侵蚀性能的研究 Title:StudyontheSulfateResistanceofSprayedConcreteunderWet-DryCycles Abstract: Sulfateattackisoneofthemostcommondeteriorationmechanismsthataffectthedurabilityofconcretestructures.Inthisstudy,theresistanceofsprayedconcreteagainstsulfateattackunderwet-drycycleswasinvestigated.Theeffectsofvariousfactors,suchasmixingdesign,curingconditions,andspecimenpreparationtechniques,onthesulfateresistancewereexamined.Theresultsprovidedvaluableinsightsintoenhancingthedurabilityofsprayedconcreteinsulfate-richenvironments. 1.Introduction 1.1Background 1.2ResearchObjective 2.LiteratureReview 2.1BriefIntroductiontoSprayedConcrete 2.2TheMechanismofSulfateAttackonConcrete 2.3PreviousStudiesonSulfateResistanceofConcrete 3.ExperimentalMethodology 3.1Materials 3.2MixingDesign 3.3SpecimenPreparation 3.4CuringConditions 3.5Wet-DryCycles 3.6TestingMethods 4.ResultsandDiscussion 4.1FreshPropertiesofSprayedConcrete 4.2CompressiveStrength 4.3SulfateResistanceunderWet-DryCycles 4.4InfluenceofCuringConditions 4.5InfluenceofSpecimenPreparationTechniques 5.AnalysisofResults 5.1RelationshipbetweenCompressiveStrengthandSulfateResistance 5.2InfluenceofVariousFactorsonSulfateResistance 5.3MechanismsofSulfateResistanceofSprayedConcrete 6.Conclusion 6.1SummaryofFindings 6.2ImplicationsforPractice 6.3RecommendationsforFutureResearch 7.References Introduction: Concretestructuresareoftenexposedtoaggressivesulfate-richenvironments,suchaswastewatertreatmentplants,chemicalstoragefacilities,andmarineenvironments.Sulfateattackcanleadtothedeteriorationofconcrete,compromisingitsstrengthandlong-termperformance.Itiscrucialtodevelopconcretemixtureswithenhancedsulfateresistancetoensurethedurabilityofstructures. Sprayedconcrete,alsoknownasshotcreteorgunite,isawidelyusedconstructiontechniquethatoffersvariousadvantages,includingspeedofapplication,abilitytobeappliedtocomplexshapes,andreductioninformworkrequirements.However,fewstudieshavefocusedspecificallyonthesulfateresistanceofsprayedconcreteunderw