Toughness enhancement in steel fiber reinforced concrete through fiber hybridization

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1、CementandConcreteResearch37(2007)1366–1372ToughnessenhancementinsteelfiberreinforcedconcretethroughfiberhybridizationN.Banthia⁎,M.SappakittipakornDepartmentofCivilEngineering,UniversityofBritishColumbia,2024-6250AppliedScienceLane,Vancouver,BC,CanadaV6T1Z4Received21March2006;accepted23May2007

2、AbstractCrimpedsteelfiberswithlargediametersareoftenusedinconcreteasreinforcement.Suchlargediameterfibersareinexpensive,disperseeasilyanddonotundulyreducetheworkabilityofconcrete.However,duetotheirlargediameters,suchfibersalsotendtobeinefficientandthetoughnessoftheresultingfiberreinforcedconc

3、rete(FRC)tendstobelow.AnexperimentalprogramwascarriedouttoinvestigateifthetoughnessofFRCwithlargediametercrimpedfiberscanbeenhancedbyhybridizationwithsmallerdiametercrimpedfiberswhilemaintainingworkability,fiberdispersabilityandlowcost.Theresultsshowthatsuchhybridizationindeedisapromisingconc

4、eptandreplacingaportionofthelargediameterscrimpedfiberswithsmallerdiametercrimpedfiberscansignificantlyenhancetoughness.Theresultsalsosuggest,however,thatsuchhybridFRCsfailtoreachthetoughnesslevelsdemonstratedbythesmallerdiameterfibersalone.©2007ElsevierLtd.Allrightsreserved.Keywords:Concrete

5、;Crimpedsteelfibers;Flexure;Toughness;Workability;Strength;Cost1.Introduction30yearsagobyWaltonandMajumdar[3].AfteralongperiodofrelativeinactivitythereappearstobearenewedinterestinConcreteisaquasi-brittlematerialwithalowstraincapacity.hybridfibercompositesandeffortsareunderwaytodeveloptheRein

6、forcementofconcretewithshortrandomlydistributedscienceandrationalebehindfiberhybridization.fiberscanaddresssomeoftheconcernsrelatedtoconcreteInwell-designedhybridcomposites,thereispositiveinterac-brittlenessandpoorresistancetocrackgrowth.Fibers,usedastionbetweenthefibersandtheresultinghybridp

7、erformancereinforcement,canbeeffectiveinarrestingcracksatbothexceedsthesumofindividualfiberperformances.Thismicro-andmacro-levels.Atthemicro-level,fibersinhibitthephenomenonisoftentermed“Synergy”.Manyfibercombina-initiationandgrowthofcracks,a