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1、TheApplicationofInertialMicrofluidicsftheSizeBasedSeparationofPolydisperseCementitiousParticlesAdityaKumar1PeterLewis1MagdalenaBalonis2DinoDiCarlo3GauravSant11.DepartmentofCivilEnvironmentalEngineeringUniversityofCalifni

2、aLosAngelesCalifniaUSA2.DepartmentofMaterialsScienceEngineeringUniversityofCalifniaLosAngelesCalifniaUSA3.MicrofluidicsBiotechnologyLabatyDepartmentofBioengineeringUniversityofCalifniaLosAngelesCalifniaUSAAbstractTheearl

3、y‐ageperfmanceofconcreteisdeterminedbythepropertiesofthecementitiousbindertheevolutionofchemicalreactionsthereinatearlyages.Thecompositionofparticleshencetheirreactivitymaybesizedependente.g.especiallyincaseofmaterialssu

4、chasflyash.Sincereactivityisakeyvariablewhichdictatestheprogressofreactionsitwouldbevaluabletoseparatecementitiousmineralsintowell‐definedsizeswhereinbyeliminatingdispersioninsizetheeffectsofcompositiononreactivitycanbes

5、ystematicallyunraveled.Thisstudyappliesanovelinertialmicrofluidics(IMF)basedproceduretoseparatecementitiouspowdersonthebasisofparticlesize.Specialattentionispaidtooptimizedevicedesignsprotocolstohelpparticlesinafluidstre

6、amlineachieveuniqueequilibriumpositionswithinthedevices.Fromsuchequilibriumpositionsparticlescanbemeeasilyretrievedinasizedependentfashionusingsymmetricaloutletconfigurationswithtunedfluidicresistances.TheIMFmethodiscrit

7、icallyassessedintermsofitsabilityto:(1)separatecementitiouspowdersthusserveasaviablefractionationprocedure(2)quantifytheparticleyieldsizeivityasafunctionofexperimentalprocessparametersi.e.fluidflowratesolidloading.Theout

8、comesofthisstudyestablishquantitativemetricsregardingtheabilityofinertialmicrofluidicsmethodstoclassifymineral(polydisperse)particlesonthebasisoftheirsize.iginalityThisstudyfthefirsttimeappliesIMFmethodstoseparatepolydis

9、persecementitiousparticulatesonthebasisofsize.3Dmicrofluidicsdevicesprocessesaredesignedoptimizedevaluatedintermsofseparationmetricsincludingparticleyieldsizeivityofparticlesinrelationtoprocessparameters.Resultsobtainedf

10、romthisstudyprovidenewguidanceregardingthestrengthslimitationsoftheIMFtechniqueonfutureresearchquestionswhichneedtobeansweredbefehighfidelityhighyieldsizebasedparticleseparationscanbeefficientlycarriedout.Keywds:inertial

11、microfluidicspolydisperseinertialfcesparticlestingcement.1Crespondingauth:Tel13102063084ThisstudyseekstoestablishtheapplicabilityofIMFmethodsasaviableapproachtoseparatemineralpowderparticleshavingeithernarrowwidePSDsinto

12、narrowsizeclasses.Acriticalpartofthestudyistheoptimizationofdevicefabricationproceduresprocessparameterstoenhanceparticleyieldsseparationfidelity.TheresultsprovideinsightsaboutstrengthslimitationsoftheIMFtechniquealsosug

13、gestresearchquestionsthatshouldbeansweredinthefuturebefehighfidelityhighyieldparticleseparationscanbeefficientlyperfmed.2.Experimental2.1.PowderCompositionPhysicalPropertiesFourpowderswereevaluated:(i)dinaryptlcement(OPC

14、)(ii)groundlimestoneacommonfillermaterialusedinconcretebinders(Lothenbachetal.2008Oeyetal.2013)(iii)coalflyash(FA)apostcombustionresiduethatisoftenusedasapozzolanicadditiveinconcrete(Lothenbachetal.2011)(iv)threesizeclas

15、sifiedsilicamicrospherepowderswithmediandiameterof1.5m4.0m8.0m.Figure1:Theparticlesizedistributions(PSDs)ofcement(OPC)coalflyash(FA)limestonepowderssilicamicrospheres.Thehighestuncertaintyinthemeasuredparticlesizedistrib

16、utionis6%basedonvariationinthemediandiameter(d50)ofPSDsofsixreplicatemeasurements.Basedontheuncertaintyinthed50valuestheerrinthespecificsurfaceareaisexpectedtoscalewiththeproductoftheparticlesize(d)Δd50whereΔd50is0.06.Th

17、eOPCwasanASTMC150compliantTypeIIIfmulationwithanestimatedphasemasscompositionof58.5%C3S18.4%C2S5.6%C3A9.2%C4AF4.2%CaCO31.3%MgOaNa2Oequivalentof0.40%b.Thegroundlimestone(CaCO3)isacommerciallyavailablepowderof95%purityprod

18、ucedbyOMYAA.G.TheoxidecompositionoftheFApowderestimatedusingXrayfluescenceis57.98%SiO227.71%Al2O36.23%Fe2O3withminquantitiesofCaOMgONa2OK2OP2O5TiO2alsomeasured.Thesilicamicrospherepowderswereusedtotesttheivityyieldofthed

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