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Studyonthetensilepropertyandabrasionresistanceofhybridfiber
reinforcedultra - highperformanceconcrete
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WANGXiongfeng ,CHENBo,ZHANGXiaochuang,LLele,ZHANGFeng
(1.TheNationalKeyLaboratoryofWaterDisasterPrevention,NanjingHydraulicResearchInstitute,Nanjing 210029,China;
2.POWERCHINAZhongnanEngineeringCorporationLtd,Changsha 410014,China)
Abstract:Inordertoclarifytheeffectofsteelfiber - PP?PVAfiberhybridontheabrasionresistanceandtensile
performanceofultra - highperformanceconcrete (UHPC),andtopromotetheapplicationoflow - costUHPCinhy
draulicdischargestructures ,theabrasionresistanceofUHPCwasinvestigatedthroughthehybridofPP?PVAfiber
withsteelfiber ,andhybridoflongandshortPVAfibers,andthemechanismoffiberhybridtoimprovetheabra
sionresistanceofUHPCwaselucidatedinthispaper.TheinfluenceofhybridofPVAfiberandsteelfiberonthe
tensilepropertiesofUHPCwasstudied.Thetensilestress - straincurveofUHPCwastested ,andtheinfluenceof
fiberhybridonthetensilefractureenergyofUHPCwasanalyzed.Theresultsshowthatadding0.2%- 1.0% PP?
PVAfiberto1.0% steelfibercanfurtherimprovetheabrasionresistanceofUHPC.Whenthefibercontentisthe
same ,theoverallabrasionresistanceofsteel - PPfiberhybridUHPCisslightlybetterthanthatofsteelfiberUHPC,
steel - PVAfiberhybridUHPC,andlongandshortPVAfiberhybridUHPC.WhentheratiooflongandshortPVA
fibersis3∶1 ,UHPChasthehighestabrasionresistance.Thetensilestress - straincurveofsteel - PVAfiberhybrid
UHPCshowsstrainsofteningcharacteristics.Thetensilestrengthofsteel - PVAfiberhybridUHPCisslightlylower
thanthatofsteelfiberUHPC,andsteelfibercanbetterinhibittheinitiationandexpansionofmicrocracksthan
steel - PVAfiberhybrid.
Keywords:ultra - highperformanceconcrete;fiberhybrid;tensileproperties;abrasionresistance
(责任编辑:韩 昆)
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