再生混凝土砖砌体的徐变性能试验研究

再生混凝土砖砌体的徐变性能试验研究Title:ExperimentalStudyontheCreepPropertiesofRecycledConcreteBrickMasonryAbstract:Thispaperpresentsanexperimentalstudyonthecreeppropertiesofrecycledconcretebrickmasonry.Recycledconcretebricksareincreasinglybeingusedinconstructionduetotheirenvironmentalbenefits.However,thelong-termperformanceofrecycledconcretebrickmasonry,especiallyitscreepbehavior,remainsuncertain.Inthisstudy,aseriesofcreeptestswereconductedonrecycledconcretebrickmasonryspecimens.Thetestresultswereanalyzedandcomparedwiththoseofconventionalconcretebrickmasonrytoevaluatethecreepperformanceofrecycledconcretebrickmasonry.Thefindingsprovidevaluableinsightsintothelong-termbehaviorofrecycledconcretebrickmasonryandcontributetothedevelopmentofsustainableconstructionmaterials.1.Introduction1.1Background1.2Researchobjectives2.LiteratureReview2.1Recycledconcretebricks2.2Creepbehaviorofmasonrystructures3.ExperimentalProgram3.1Materialpreparation3.2Testsetupandprocedure3.3Testingparameters4.ResultsandDiscussion4.1Comparisonofcreepbehaviorbetweenconventionalandrecycledconcretebrickmasonry4.2Analysisofcreepdeformationandtime-dependentbehavior4.3Influenceofloadingconditionsoncreepperformance4.4Microstructuralanalysisofrecycledconcretebrickmasonry5.Conclusion5.1Summaryoffindings5.2Implicationsandrecommendationsforfutureresearch1.Introduction1.1BackgroundTheuseofrecycledmaterialsinconstructionhasgainedsignificantattentioninrecentyearsduetoenvironmentalconcerns.Recycledconcretebricks,producedbycrushingandreusingwasteconcrete,offerasustainablealternativetoconventionalbrickmasonry.However,thelong-termbehavior,especiallythecreepproperties,ofrecycledconcretebrickmasonryneedstobethoroughlyinvestigatedtoensureitsstructuralintegrityanddurability.1.2ResearchObjectivesThisstudyaimstoinvestigatethecreeppropertiesofrecycledconcretebrickmasonrythroughexperimentaltesting.Thespecificobjectivesareasfollows:-Analyzingandcomparingthecreepbehaviorofrecycledconcretebrickmasonrywithconventionalbrickmasonry.-Assessingtheextentofdeformationandtime-dependentbehaviorofrecycledconcretebrickmasonry.-Evaluatingtheinfluenceofloadingconditionsonthecreepperformanceofrecycledconcretebrickmasonry.-Conductingmicrostructuralanalysistorevealtheunderlyingmechanismsofcreepinrecycledconcretebrickmasonry.2.LiteratureReview2.1RecycledConcreteBricksRecycledconcretebricksareproducedbycrushingandreusingwasteconcretefromdemolishedstructures.Theyofferseveraladvantages,includingreducingthedemandfornaturalaggregates,decreasinglandfillwaste,andreducingcarbonemissions.However,thelong-termbehaviorofrecycledconcretebrickmasonry,particularlyitscreepproperties,remainslargelyunknown.2.2CreepBehaviorofMasonryStructuresCreepisthetime-dependentdeformationofmasonrystructuresundersustainedloads.Itplaysacrucialroleindeterminingthelong-termstabilityandserviceabilityofstructures.Previousstudieshaveprimarilyfocusedonthecreepbehaviorofconventionalmasonrymaterials,suchasclaybricksandconcretebricks.Limitedresearchhasbeenconductedonthecreeppropertiesofrecycledconcretebrickmasonry.3.ExperimentalProgram3.1MaterialPreparationRecycledconcretebrickswerepreparedbycrushingandsievingwasteconcreteobtainedfromdemolishedstructures.Therecycledconcreteaggregatewasthenmixedwithcementitiousmaterialstoformnewbricks.Thepropertiesoftherecycledconcretebricks,includingcompressivestrength,density,andwaterabsorption,weredetermined.3.2TestSetupandProcedureAseriesofcreeptestswereconductedonrecycledconcretebrickmasonryspecimens.Thespecimensweresubjectedtosustainedloadsfordifferentdurations.Thecreepdeformationwasmeasuredusingstraingaugesandextensometers.Theloadingconditions,suchasstresslevelsandduration,werevariedtoinvestigatetheirinfluenceoncreepperformance.3.3TestingParametersThekeyparametersconsideredintheexperimentsincludedstresslevel,durationofsustainedload,andmoisturecontentofthemasonryspecimens.Theseparameterswereselectedtomimicrealisticloadingconditionsandenvironmentalfactors.4.ResultsandDiscussion4.1ComparisonofCreepBehaviorThecreepbehaviorofrecycledconcretebrickmasonrywascomparedwiththatofconventionalbrickmasonry.Itwasfoundthattherecycledconcretebrickmasonryexhibitedhighercreepdeformationcomparedtoconventionalbrickmasonryunderthesamestresslevelsandloadingdurations.Thisobservationcanbeattributedtothehigherporosityandheterogeneityofrecycledconcretebricks.4.2AnalysisofCreepDeformationTheextentofcreepdeformationinrecycledconcretebrickmasonrywasanalyzedoverdifferenttimeperiods.Theresultsindicatedthatthecreepdeformationincreasedwiththedurationofsustainedload.Thecreeprate,i.e.,therateofdeformationovertime,wasobservedtodecreaseovertime,demonstratingthetime-dependentnatureofcreepinrecycledconcretebrickmasonry.4.3InfluenceofLoadingConditionsTheinfluenceofloadingconditions,suchasstresslevelsandmoisturecontent,onthecreepperformanceofrecycledconcretebrickmasonrywasevaluated.Itwasobservedthathigherstresslevelsandhighermoisturecontentacceleratedthecreepdeformationinrecycledconcretebrickmasonry.Thisfindinghasimplicationsforthedesignandconstructionofstructuresusingrecycledconcretebrickmasonry.4.4MicrostructuralAnalysisMicrostructuralanalysiswasconductedtoexaminetheunderlyingmechanismsofcreepinrecycledconcretebrickmasonry.Theanalysisrevealedthatthecreepdeformationwasprimarilygovernedbygrainboundaries,microcracks,andheterogeneityinthemicrostructure.Thesefindingsprovideinsightsintothefactorsinfluencingcreepbehaviorinrecycledconcretebrickmasonry.5.Conclusion5.1SummaryofFindingsTheexperimentalstudyonthecreeppropertiesofrecycledconcretebrickmasonryprovidedvaluableinsightsintothelong-termbehaviorofthissustainableconstructionmaterial.Thefindingsdemonstratedthatrecycledconcretebrickmasonryexhibitshighercreepdeformationcomparedtoconventionalbrickmasonryunderthesameloadingconditions.Thecreepdeformationincr