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
已閱讀1頁，還剩5頁未讀， 繼續(xù)免費閱讀

下載本文檔

版權(quán)說明：本文檔由用戶提供并上傳，收益歸屬內(nèi)容提供方，若內(nèi)容存在侵權(quán)，請進行舉報或認(rèn)領(lǐng)

文檔簡介

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

溫馨提示

  • 1. 本站所有資源如無特殊說明，都需要本地電腦安裝OFFICE2007和PDF閱讀器。圖紙軟件為CAD,CAXA,PROE,UG,SolidWorks等.壓縮文件請下載最新的WinRAR軟件解壓。
  • 2. 本站的文檔不包含任何第三方提供的附件圖紙等，如果需要附件，請聯(lián)系上傳者。文件的所有權(quán)益歸上傳用戶所有。
  • 3. 本站RAR壓縮包中若帶圖紙，網(wǎng)頁內(nèi)容里面會有圖紙預(yù)覽，若沒有圖紙預(yù)覽就沒有圖紙。
  • 4. 未經(jīng)權(quán)益所有人同意不得將文件中的內(nèi)容挪作商業(yè)或盈利用途。
  • 5. 眾賞文庫僅提供信息存儲空間，僅對用戶上傳內(nèi)容的表現(xiàn)方式做保護處理，對用戶上傳分享的文檔內(nèi)容本身不做任何修改或編輯，并不能對任何下載內(nèi)容負(fù)責(zé)。
  • 6. 下載文件中如有侵權(quán)或不適當(dāng)內(nèi)容，請與我們聯(lián)系，我們立即糾正。
  • 7. 本站不保證下載資源的準(zhǔn)確性、安全性和完整性, 同時也不承擔(dān)用戶因使用這些下載資源對自己和他人造成任何形式的傷害或損失。

評論

0/150

提交評論