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大掺量粉煤灰矿用水泥基封孔材料的早强性能研究 Title:EarlyStrengthPerformanceStudyofCement-basedSealingMaterialswithHighDosagesofFlyAshandMineTailings Abstract: Thisstudyaimstoinvestigatetheearlystrengthperformanceofcement-basedsealingmaterialswithahighdosageofflyashandminetailings.Thesealingmaterialsplayacrucialroleincontrollingwaterleakageandmaintainingthestabilityofundergroundstructures.However,conventionalcement-basedsealingmaterialsoftenlacksufficientearlystrength,whichaffectstheireffectivenessinsealingandstability.Toaddressthisissue,aseriesoflaboratoryexperimentswereconductedtoevaluatetheearlystrengthperformanceofsealingmaterialscontainingdifferentproportionsofflyashandminetailings.Theresultsshowedthatbyincorporatingahighdosageofflyashandminetailings,theearlystrengthperformanceofthecement-basedsealingmaterialscanbesignificantlyimproved.Thefindingsofthisstudycontributetothedevelopmentofcost-effectiveandenvironmentallyfriendlycement-basedsealingmaterialsforundergroundconstructionprojects. 1.Introduction 1.1Background -Importanceofsealingmaterialsinundergroundconstruction -Challengeswithconventionalcement-basedsealingmaterials 1.2Objectives -Investigatetheearlystrengthperformanceofsealingmaterialswithhighdosagesofflyashandminetailings -Evaluatethepotentialofusingsuchmaterialsinundergroundconstructionprojects 2.LiteratureReview 2.1Cement-basedsealingmaterials -Compositionandproperties -Commonadditivesandtheireffectsonstrength -Previousstudiesonimprovingearlystrength 2.2Flyashandminetailings -Propertiesandpotentialusesinconstruction -Previousstudiesontheireffectsoncement-basedmaterials -Benefitsandchallengesofusinghighdosages 3.Methodology 3.1Materials -Cement,flyash,andminetailingsspecifications -Proportioningofmixtures 3.2Experimentalsetup -Preparationofspecimens -Curingconditions -Testingprocedures 4.ResultsandDiscussion 4.1Compressivestrengthdevelopment -Comparisonofdifferentmixtures -Effectsofcuringtime -Microstructuralanalysisofhardenedspecimens 4.2Waterpermeability -Testingmethodsa