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基于多级应力局部加载的路面芯样高温蠕变试验研究.docx

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基于多级应力局部加载的路面芯样高温蠕变试验研究 Title:ExperimentalStudyonHigh-TemperatureCreepofPavementCoresBasedonMulti-LevelStressLocalLoading Abstract: High-temperaturecreepisasignificantconcerninpavementengineering,asitleadstoirreversibledeformation.Thisstudyaimstoinvestigatethebehaviorofpavementcoresunderhigh-temperaturecreepconditionsusingamulti-levelstresslocalloadingmethod.Theexperimentalresultsprovidevaluableinsightsintothedesignandperformanceevaluationofpavementssubjectedtoelevatedtemperatures. 1.Introduction: Theperformanceofpavementsunderhigh-temperatureconditionsiscrucialforthesafetyanddurabilityoftransportationinfrastructure.Onemajorconcernisthecreepbehavior,whichreferstothetime-dependentdeformationofmaterialsunderaconstantload.Currentmethodsforstudyingpavementcreeparelargelylimitedtomacroscopicmeasurements.However,understandingthelocalresponseofpavementmaterialsundermulti-levelstressloadingisessentialforaccuratepredictionsanddesignofpavements. 2.ExperimentalMethodology: 2.1SamplePreparation: Severalcylindricalcoresofasphaltconcreteorconcretematerialsareextractedfromin-servicepavements.Thesecoresshouldhaveasufficientlengthanddiametertoensurerepresentativebehaviorunderhightemperatures. 2.2TestingApparatus: Ahigh-temperaturecreeptestingapparatusisdesignedandsetuptosimulatetheserviceconditionsexperiencedbypavementcores.Theapparatusconsistsofahigh-temperaturechamber,loadingdevice,andmeasurementdevices. 2.3Multi-LevelStressLocalLoading: Tocapturethelocalizedbehaviorofpavementmaterials,amulti-levelstressloadingsystemisemployed.Thisloadingsystemallowsfortheapplicationofdifferentstresslevelstodifferentsectionsofthepavementcore.Thismimicsthestressdistributioninrealpavementstructures. 3.ExperimentalProcedure: 3.1ThermalConditioning: Thepavementcoresarepreheatedtothedesiredtesttemperatureinsidethehigh-temperaturechamber.Severaltemperaturelevels(e.g.,50°C,60°C,70°C,etc.)areselectedtocoverawiderangeofpotentialpavementoperatingtemperatures. 3.2Multi-LevelStressApplication: Oncethecoresrea