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@163.com(1:0.11)(C)42.5R(Si)20m2/g0.1-0.2µm(S)2.82.56g/cm3(FDN)(W)3.5mm50µm(SF1)13mm0.2mm(SF2)11(20020004020)-1-(g/cm3)(µm)(mm)(MPa)(GPa)SF1..SF2.CSiWSSF1SF2C0.5-11.5-C0.5-21.00.5C0.5-30.750.75C0.5-40.51.0C0.5-50.31.2C0.5-60.90.10.350.5-1.5C1.0-11.5-C1.0-21.00.5C1.0-30.750.75C1.0-40.51.0C1.0-50.31.2C1.0-60.90.10.351.0-1.5C1.5-11.5-C1.5-21.00.5C1.5-30.750.75C1.5-40.51.0C1.5-50.31.2C1.5-60.90.10.351.5-1.5C2.5-11.5-C2.5-21.00.5C2.5-30.750.75C2.5-40.51.0C2.5-50.31.2C2.5-60.90.10.352.5-1.5)0.51.02.02.541.51.54240mm40mm100mm24h28dDKZ—5003-2-=0.5S/B=1.0S/B=1.5S/B=2.510.51.01.52.59.0%~19.6%8.2%~38.9%16.0%~44.1%21.5%~104.3%S/B(0.51.0)S/BS/B1.52.5S/BS/BS/B0.51.5%SF1S/B2.51.5%SF2S/B1.01.5(VSF1/VSF2)(1.2%1/0.3%2)(0.75%1/0.75%2)S/BS/B1.5-3-)1(332211hL+++=VSVSVSVSRhVhRhSiSiVVVVV=+++L3211(1)(2)0.50.60.70.80.91.01.11.21.31.42.51.51.00.5RhS/BSF1(1.2%)/SF2(0.3%)SF1(1.0%)/SF2(0.5%)SF1(0.75%)/SF2(0.75%)SF1(0.5%)/SF2(1.0%)2S/B0.5C0.5-2C0.5-31C0.5-4C0.5-51S/B1.0S/B2.5(0.75%)S/B0.52.50.3%0.5%0.75%1.0%1.101.111.131.14S/BS/B-4-(C1.5-6)-(C1.5-2C1.5-3)-(C1.5-4)0.00.20.40.60.81.01.21.40.00.10.20.30.40.50.60.70.80.91.01.11.21.31.4SF11.2%+SF20.3%SF11.5%SF11.0%+SF20.5%SF21.5%SF10.5%+SF21.0%SF10.75%+SF20.75%/(kN/mm3-ASTMC-1018-GF31.5%(C1.5-1)1.5%SF2(C1.5-6)372.6·C1.5-3518.1·15139C1.5-3I5I10I304.9310.59-5-·206.6479.7518.1372.6I52.244.864.933.853.284.80I102.5310.2810.598.675.0310.52I30-21.528.3316.2212.2020.3SF1412S/BS/BS/B3SF1SF21/1[1]Abbas,Rafik;El-Rafey,Essam,Mechanicalpropertiesofhybridfiberreinforcedconcrete[J].AEJAlexandriaEngineeringJournal,2002,41(3):455-464.[2]Ahmed,S.F.U.,Maalej,M.andParamasivam,P.,Strain-HardeningBehaviourofHybridFibreReinforcedCementComposites[J].JournalofFerrocement,2003,33(3):172-182.[3]Banthia,N.andBindiganavile,V.,RepairingwithHybridFiberReinforcedConcrete[J].ConcreteInternational,DesignandConstruction,2001,23(6):29-32.[4]LucaSorelli,Somestudiesontheassessmentofthefracturetoughnessoffiberreinforcedconcretewithanemphasisonhybridfibersystems[M].Athens,StarrylinkEditrico,2003.[5]Banthia,Nemkumar;Dubeau,Sylvie.CarbonandSteelMicrofiber-ReinforcedCement-BasedComposites-6-[J].JournalofMaterialsinCivilEngineering,1994,6(1):88-99.[6]Abbas,Rafik;El-Rafey,Essam,Mechanicalpropertiesofhybridfiberreinforcedconcrete[J].AEJ-AlexandriaEngineeringJournal,2002,41(3):455-464.[7]Lawler,J.S.,Wilhelm,T.,Zahmpini,D.,Shah,S.P.Fractureprocessesofhybridfiber-reinforcedmortar[J].MaterialsandStructures,2003,36(4):257.[8],.[J]..2003,31(7):853-856.Studyofthemechanicalpropertiesofdifferentsizehybridsteelfiber-reinforcedcement-basedmaterialsShuJinLIKeRuWUSchoolofmaterialsscienceandengineering,TongjiUniversity,Shanghai,PRC,200092AbstractThemechanicalpropertiesofmicro-diametersteelwoolandmedium-diametersteelhybridfiberreinforcedcement-basedmaterialsareinvestigated.Ataconstantfibervolumefractiontheincreaseofmechanicalpropertiesgainedbyhybridfiberishigherthanthemon-diameterfiberreinforcedcement-basedmaterials.Differentsizehybridfibershowsdistinctsynergisticeffectsofbendingstrengthandtoughnessofcement-basedmaterials.TheS/Bisanimportancefactorofmechanicalspropertiesoffiberreinforcedcement-basedmaterials.WiththeincreaseofS/B,itneedsmoremedium-diametersteelfibertosubstitutemicro-diameterfiberinhybridfibersystem.Thehybridsystemoftwodifferentdiameterfibercangaindistincthybrideffectsinfractureandtoughnessofcement-basedmaterials.Keywords:fiberhybrid;synergisticeffects;cement-basedmaterials;S/B;mechanicalproperties1975-7-