fiber bridging degradation of strain hardening fiber reinforced cementitious composites.docx
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fiber bridging degradation of strain hardening fiber reinforced cementitious composites.docx
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fiberbridgingdegradationofstrainhardeningfiberreinforcedcementitiouscomposites
Compositemetal-carbonfiberreinforcedpolymer(CFRP)tubescombinethebenefitsofthehighstrengthtoweightratioofthefiber/resincompositeandthestable,ductileplasticcollapsemechanismofthemetal,toformacompositetubewithhighstrengthandenergyabsorptioncapability.Thispaperinvestigatestheaxialcapacityandcrushingbehaviorofsquarehollowsection(SHS)tubescomposedofcompositesteel-CFRP,stainlesssteel-CFRPandaluminum-CFRP.ExperimentsoftubeswithdifferentmetalSHSgeometriesandtwodifferentmatrixlayoutsofcarbonfibersaredescribed,andageneraltheorytopredictthecompressionbuckling,axialcapacity,axialcollapseandmeancrushloadofmetal–fibersquaretubesisdevelopedandvalidatedagainsttheexperimentalresults.ItisshownthatcarbonfibermaybesuccessfullyexternallybondedtometalSHS,andsuchapplicationmaybeprovidedtoimprovetheperformanceofexistingstructures,ortodesignnewstructureswithenhancedstrength-weightandenergyabsorption-weightratios.Comparisonsaremadebetweentheperformanceofthedifferenttypesofmetals,SHSgeometriesandcarbonfibermatrixlayouts.
ArticleOutline
Nomenclature
1.Introduction
2.Experimentalsetupandtestspecimens
3.Experimentalresults
3.1.Failuremechanisms
3.2.Force–displacementresults
3.3.Elasticbucklingresults
3.4.Axialcapacityresults
3.5.Axialcrushingresults
4.Theoreticalaxialcompressionbehavior
4.1.General
4.2.Compressionbucklingandaxialcapacity
4.3.Axialcollapseandmeancrushload
4.4.Materialbehavior
5.Designofmetal–fibertubes
5.1.Axialload–axialdeformationrelationship
5.2.Generalapplication
5.3.Comparativeperformanceoftubemetalandgeometry
5.4.Dynamiceffects
6.Conclusions
Acknowledgements
References
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19
Areviewontheapplicationofinorganicnano-structuredmaterialsinthemodificationoftextiles:
Focusonanti-microbialproperties ReviewArticle
ColloidsandSurfacesB:
Biointerfaces,Volume79,Issue1,1August2010,Pages5-18
RoyaDastjerdi,MajidMontazer
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AbstractAbstract|Figures/TablesFigures/Tables|ReferencesReferences
Abstract
Textilescanprovideasuitablesubstratetogrowmicro-organismsespeciallyatappropriatehumidityandtemperatureincontacttohumanbody.Recently,increasingpublicconcernabouthygienehasbeendrivingmanyinvestigationsforanti-microbialmodificationoftextiles.However,usingmanyanti-microbialagentshasbeenavoidedbecauseoftheirpossibleharmfulortoxiceffects.Applicationofinorganicnano-particlesandtheirnano-compositeswouldbeagoodalternative.Thisreviewpaperhasfocusedonthepropertiesandapplicationsofinorganicnano-structuredmaterialswithgoodanti-microbialactivitypotentialfortextilemodification.Thediscussednano-structuredanti-microbialagentsincludeTiO2nano-particles,metallicandnon-metallicTiO2nano-composites,titaniananotubes(TNTs),silvernano-particles,silver-basednano-structuredmaterials,goldnano-particles,zincoxidenano-particlesandnano-rods,coppernano-particles,carbonnanotubes(CNTs),nano-clayanditsmodifiedforms,gallium,liposomesloadednano-particles,metallicandinorganicdendrimersnano-composite,nano-capsulesandcyclodextrinscontainingnano-particles.Thisreviewisalsoconcernedwiththeapplicationmethodsforthemodificationoftextilesusingnano-structuredmaterials.
ArticleOutline
1.Introduction
2.Classificationofinorganic-basednano-structuredmaterials
2.1.Inorganicnano-structuredmaterialsandtheirnano-composites
2.1.1.TiO2nano-particles
2.1.1.1.MetallicTiO2nano-composites
2.1.1.2.Non-metallicTiO2nano-composites
2.1.1.3.Titaniananotubes(TNTs)
2.1.2.Silvernano-particles
2.1.2.1.Silver-based-nano-structuredmaterials
2.1.3.ZnOnano-particlesandnano-rods
2.1.4.Coppernano-particles
2.1.5.Nano-clayanditsmodifiedspecies
2.1.6.CNTanditsnano-composites
2.1.7.Goldnano-particles
2.1.8.Anti-bacterialagentsbasedongallium
2.2.Inorganicnano-structuredloadedorganiccarriers
2.2.1.Liposomes
2.2.2.Dendrimers
2.2.3.Nano-capsules
2.2.4.Cyclodextrin
3.Textilemodificationmethods
4.Potentialityofhealthandenvironmentalrisksofnano-structuredmaterials
5.Remarksandoutlooks
References
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20
Propertiesofpolymermodifiedsteelfiber-reinforcedcementconcretes OriginalResearchArticle
ConstructionandBuildingMaterials,Volume24,Issue7,July2010,Pages1201-1206
GengyingLi,XiaohuaZhao,ChuiqiangRong,ZhanWang
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Abstract
Polymermodifiedsteelfiber-reinforcedconcreteswereproducedwithadditionofbothsteelfibersandastyrenebutadienerubberemulsion(SBR).Bothflexuralandcompressivestrengthofthecompositesafter28 dayscuringweretested.Microstructuresofthecompositeswereanalyzedbyusingscanningelectronmicroscopeandmercuryintrusionporosimetry.Resultsshowthattheadditionofsteelfibersincreasesbothflexuralandcompressivestrengthofthecomposites.Theflexuralstrengthincreasessignificantlywhencontaining3–10 wt.%SBR.TheoptimaluseofSBRis5 wt.%.However,thecompressivestrengthmaydecreasewiththeadditionofSBR.Whentheadditionarrives10 wt.%,a16%reductionisobserved.TheoverallporosityandporesizedistributionofthecompositesvarywithSBRcontent.Theadditionof3or5 wt.%SBRcanrefinetheporesizedistribution.Interweavingpolymerfilmswereobservedinthecomposites.
ArticleOutline
1.Introduction
2.Experimentalprogram
2.1.Materials
2.2.Specimenpreparationandtestmethods
3.Resultsanddiscussion
3.1.Mechanicalpropertiesandcostfeasibility
3.2.Microstructure
3.3.Porosityandporesizedistribution
4.Conclusions
Acknowledgements
References
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21
Developmentofacarbonfiberreinforcedpolymersystemforstrengtheningsteelstructures OriginalResearchArticle
CompositesPartA:
AppliedScienceandManufacturing,Volume39,Issue2,February2008,Pages388-397
SamiRizkalla,MinaDawood,DavidSchnerch
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Abstract
Thispapersummarizesthedevelopmentanduseofhighmoduluscarbonfiberreinforcedpolymer(HMCFRP)materialsfortheretrofitofsteelstructuresandbridges.ThedevelopmentworkincludedselectionofanappropriateadhesiveforbondingHMCFRPmaterialstosteelandtheperformanceoflarge-scalesteel–concretecompositebeamstestedtoexaminethebehaviorusingdifferentstrengtheningschemes.Theexperimentalprograminvestigatedthebehaviorofthestrengtheningsystemunderfatigueandoverloadingconditions.Adetailedstudyofbondbehavior,includingthepossiblepresenceofshear-lageffectsandperformanceofsplicedjointsisalsopresented.Basedonthefindings,flexuraldesignguidelinesareproposed.ThestudyindicatesthatCFRPmaterialscanbeeffectivelyusedtoenhancetheserviceabilityandultimatestrengthofsteelflexuralmembers.
ArticleOutline
1.Introduction
2.HMCFRPmaterials
3.Phase1:
resinandadhesiveselection
4.Phase2:
large-scalevalidation
5.Phase3:
overloadingbehavior
6.Phase4:
fatiguebehavior
7.Phase5:
shear-lagstudy
8.Phase6:
bondandsplicebehavior
9.Proposeddesignguidelines
10.Conclusions
Acknowledgements
References
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Useofsteelfiberreinforcedmortarforseismicstrengthening OriginalResearchArticle
ConstructionandBuildingMaterials,Volume25,Issue2,February2011,Pages892-899
TuğçeSevil,MehmetBaran,TurhanBilir,ErdemCanbay
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Abstract
Theobjectiveofthisresearchwastodevelopaneconomical,structurallyeffective,andpracticallyapplicablesteelfiberreinforcedmortar(SFRM)whichcouldbeappliedontothehollowbrickinfillsofareinforcedconcrete(RC)structure.MasonrywallswerealmostconvertedintostrongandrigidinfillswiththeapplicationofSFRM.TwodifferentmixproportionswereproducedwiththecompositionofPortlandcement,fineaggregate,water,andplasticizerorbondingagentasthechemicaladmixture.Testswerecarriedouttodeterminetheoptimumsteelfibercontent(1%,2%,or4%byvolume)andtoclarifytheuseofplasticizerorbondingagentinthemortarinthecontextofstickingability,flexural,compressive,andadhesionstrengths.Asaresult,mortarwithplasticizerand2%steelfiber(byvolume)cameouttobetheoptimummortarmixtureasstrengtheningmaterial.TheperformanceofRCframestrengthenedwithSFRMcontainingplasticizerand2%steelfiberbyvolumewascomparedtothoseofthehollowbrickinfilledRCframewithoutstrengthenedmortarandthehollowbrickinfilledRCframewithreferencemortar.Itwasobservedthatthespecimenstrengthenedwiththeoptimummortarmixsatisfiedthetargetobjectivesofthisstudy.
ArticleOutline
Nomenclature
1.Introduction
2.Researchsignificance
3.Materialsandmethods
3.1.Materialproperties
3.1.1.Cement
3.1.2.Fineaggregate
3.1.3.Steelfiber
3.1.4.Plasticizer
3.1.5.Bondingagent
3.1.6.Water
3.2.Method
3.
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