2023年全國碩士研究生考試考研英語一試題真題（含答案詳解+作文范文）_第1頁
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1、HydrationofternarycementselabatedwithlimestonefillercalcinedkaoliniticclayTironiA.1ScianA.N.2IrassarE.F.11.FacultaddeIngenieraCIFICEN(CONICET–UNCPBA)B7400JWIArgentina2.CentrodeTecnologadeRecursosMineralesyCermica(CONICET

2、LaPlata–UNLP)B1897ZCAArgentinaAbstractThispaperdescribestheperfmanceofternaryblendedcementsmadewithcalcinedclays(CC)limestonefiller(F)twodifferentPtlcements(PC).CCwasobtainedfromkaoliniticclay(lowgradeofkaolinitequartzas

3、mainimpurity)calcinedat750Cduring4hours.ThemetakaolinitecontainingintheCC(44%)hasahighpozzolanicactivity.PtlcementswithlowmediumC3Acontentwereused.TernaryblendedcementswerepreparedreplacingCC(0to30%)F(0to10%)bymassinboth

4、PCsused.PozzolanicactivityofblendedcementswasmeasuredusingFrattinitestintermsofcompressivestrengthat2728days.ThemicrostructuralchangewasfollowedbyXRDtodeterminetheassemblyofhydrationproductsthepositydeterminedbymercuryin

5、trusionposimetry(MIP)TheresultsofthisstudyshowthatthepozzolanicactivityofCCismeeffectiveflowC3AcontentinPC.Thepresenceoflimestonefillerstimulatesthepozzolanicreactionafter7daysfbothPCs.Thelimestonefillerinternaryblendedc

6、ementshasalargecontributiontocompressivestrengthwhenthePCusedhasmediumC3Acontent.ThecombinationofCCFincreasestheamountofAFmphases.Atallagesblendedcementswith5%F15%CCpresentthebestperfmance.TheC3AcontentinthePtlcementisas

7、ignificantvariabletobeconsideredfthefmulationofblendedcementswithCCF.ThecoupledeffectofCCFincreasedwhenincreasedtheC3AcontentinPtlcement.iginalityTheuseofcalcinedclaysprovidingfromlowgradekaoliniticclayscombinedwithlimes

8、tonefillerinternaryblendedcementsfmulationpresentstechnologicalenvironmentaladvantages.Themetakaolinitecontainingincalcinedclaysisthepozzolanicmaterialquartzisthemainimpurityofcalcinedclayactingassiliceousfillerthelimest

9、onefilleraddedprovidethecarbonatetostabilizetheAFmphasesproducedbypozzolanicreactionofthemetakaolinite.TheternarycementspresentsanacceptabledevelopsofmechanicalpropertieswithalargereductionofenergyconsumptionCO2emissiond

10、uringitsmanufacture.Keywds:Ternaryblendedcementskaoliniticcalcinedclaylimestonefillerhydrationcompressivestrength.1Crespondingauth:Tel542284451055PANalyticalHighScePlussoftwarewasedusingtheproceduredescribedbyKocabaV.200

11、9.2.4PosityThepositywasdeterminedbymercuryintrusionposimetry(MIP).Thepesizedistributionindriedpastesat2728dayswasdeterminedusingamercuryintrusionposimeter(MIPThermoFisherScPA440)fthepesizediametersfrom7.3to14000nm.3.Resu

12、ltsdiscussion3.1PozzolanicactivityFig.1showstheresultsofFrattinitestfblendedcements.AtallagesPCpastesdonothavepozzolanicactivitythepointsrepresentingtheresultsareabovethesaturationcurve.At2daysthecombinedeffectofdilution

13、pozzolanicreactiondecreasesthe[CaO]inthesupernatantsolutionofblendedcementwith30%ofCC.After7daysallblendedcementspreparedwithCCshowedevidenceofpozzolanicreaction.The[CaO][OH]reductionwasgreaterwhentheCCreplacementlevelin

14、creases.Thepresenceoflimestonefillerstimulatesthepozzolanicreactionafter7daysfbothPCs.Fig1.Frattinitestresultsat2728daysfblendedcementswithPC1(lowC3A)PC2(mediumC3A).3.2CompressivestrengthFig.2showsthecompressivestrength(

15、CS)at2728days.PC2withmediumC3Acontentdevelopsgreatercompressivestrengthatearlyage(27days)howeverPC1hasgreatercompressivestrengthat28days.FbothPtlcementsthe5F15CCblendedcementshavebetterperfmance.F5F15CC1ithasasimilarbeha

16、vithatPC1atallages.TheblendedcementwithanyCCpercentageattainstocompressivestrengthclosetothatofPC1(lowC3A).At28days30CC1hasgreaterCSthanthatofPC1.AdditionoflimestonefillercontributestothecompressivestrengthwhenusePC2(med

17、iumC3Acontent)withCC.Antonietal.(2012)usingaPCwithmediumC3Acontent(6.4%)mixedwith30%ofhighpureMKdeterminedarelativestrengthof119%at28dayswhereasitwas115%fblendedcementcontaining10%limestone20%MK.Steenbergetal(2011)usinga

18、PCwith8%C3A30%ofMK(premiumgrade)determinedarelativestrengthof84%at28days109%fblendedcementwith10%limestone20%MK.FthisstudytheMKusedisdifferentitsreactivitytoo.HowevertheeffectivelycoupledactionofMKlimestonecombinationism

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