高温下CFRP-混凝土界面受剪性能研究的中期报告.docx

高温下CFRP-混凝土界面受剪性能研究的中期报告

Abstract

Inrecentyears,theuseofcarbonfiberreinforcedpolymers(CFRP)instrengtheningconcretestructureshasbecomeincreasinglypopular.However,thereislimitedresearchontheperformanceofCFRP-concreteinterfacesunderelevatedtemperatures.Inthisstudy,themid-termresultsofanongoingresearchprojectinvestigatingtheshearbehaviorofCFRP-concreteinterfacesunderhightemperaturesarepresented.TheexperimentalprogramincludesthemanufactureofCFRP-concretespecimens,whicharetestedunderbothambientandelevatedtemperatures,andtheanalysisofthecollecteddata.

Introduction

ThestrengtheningofconcretestructuresusingCFRPhasbecomeanattractiveoptionduetoitshighspecificstrength,corrosionresistance,andeaseofinstallation.However,themechanicalbehaviorofCFRP-concreteinterfacescanbeinfluencedbyvariousfactors,includingthetemperatureenvironment.ElevatedtemperaturescanleadtoareductioninthebondstrengthbetweenCFRPandconcrete,whichcanresultinprematurefailureandreducedeffectivenessofthestrengtheningsystem.Therefore,itisessentialtoinvestigatetheshearbehaviorofCFRP-concreteinterfacesunderhightemperatures.

ExperimentalProgram

Theexperimentalprogramconsistsofthreephases.Inthefirstphase,CFRP-concretespecimensweremanufacturedusingtwotypesofadhesives:epoxyandmodifiedepoxy.ThespecimensweresubjectedtoadirectsheartestatambienttemperaturetodeterminetheinitialshearstrengthoftheCFRP-concreteinterface.

Inthesecondphase,thesametypeofspecimenswassubjectedtoadirectsheartestatelevatedtemperaturesrangingfrom60to150°C.Thespecimenswereplacedinafurnacefor2hourstoreachthedesiredtemperaturebeforethetest.Thetemperaturewasmaintainedthroughoutthetestingprocess.Thetestdatawereusedtodeterminethetemperature-dependentshearstrengthoftheCFRP-concreteinterface.

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