特波兰石灰石水泥和混凝土的性能分析材料科学与工程外文资料翻译大学毕设论文.docx
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特波兰石灰石水泥和混凝土的性能分析材料科学与工程外文资料翻译大学毕设论文.docx
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特波兰石灰石水泥和混凝土的性能分析材料科学与工程外文资料翻译大学毕设论文
毕业论文外文资料翻译
题目波特兰石灰石水泥和混凝土的
性能分析
学院材料科学与工程
专业材料科学与工程
班级XXXXXX
学生xx
学号xxXXXXXX
指导教师XXXX
二零一三年四月二十日
Cement&ConcreteComposites24(2002)371–378
AnanalysisofthepropertiesofPortlandlimestone
cementsandconcrete
S.Tsivilisa,*,E.Chaniotakisb,G.Kakalia,G.Batisa
aChemicalEngineeringDepartment,NationalTechnicalUniversityofAthens,9HeroonPolytechniouSt.,15773Athens,Greece
bDepartmentofResearchandDevelopment,TitanCementCompanyS.A.,KamariPlantViotias,P.O.Box18,19200Elefsis,Greece
Abstract
InthispaperthemainfactorsafectingthepropertiesofPortlandlimestonecementsarediscussedwhilethehydrationbehavioroflimestonecementsisexamined.Inaddition,theintergrindingprocess,concerningtheproductionofthelimestonecements,isstudied.Finallythepropertiesandthebehavioroflimestonecementconcreteaswellasthecorrosionbehavioroflimestonecementmortarareinvestigated.Itisconcludedthatthefinenessofclinkerandlimestoneisstronglyconnectedwiththelimestonecontentandthefinenessofthecement.Thelimestonecementsindicatesatisfactorystrengthandgenerallydemandlesswaterthantherelativepurecements.Thelimestoneadditionimprovestheclinkerreactivityandtheexploitationofitshydraulicpotential.ThePortlandlimestonecementsindicatecompetitiveconcretepropertiesandimprovethecorrosionperformanceoftheconcrete.2002ElsevierScienceLtd.Allrightsreserved.
Keywords:
Portlandlimestonecement;Intergrinding;Cementproperties;Hydration;Concreteproperties;Corrosion
1.Introduction
TheuseofPortlandlimestonecementsseemstohavemanybenefits,bothtechnicalandeconmical[1-3].Inaddition,theEuropeanStandardEN197-1identifiestwotypesofPortlandlimestonecementcontaining6-20%limestone(typeII/A-L)and21-35%limestone(typeII/B-L),respectively[4].ItisexpectedthatthefutureworldproductionofPortlandlimestonecementwillbecontinuouslyincreased.Thewideuseoflimestonecementrequiresathoroughknowledgeofthecementandconcreteproperties.
Asfarasthecementisconcerned,theresearchworkisfocusedonthreeareas.Thefirstoneistheefectoflimestoneonthecementperformance[3,5-8].Thesecondonedealswiththeparticipationoflimestoneinthehydrationreactionsofclinker[9-19],whilethethirdonewiththeproductionprocessandspecificallytheintergrindingofclinkerandlimestone[5,20-22].Althoughthereisadisagreementinmanypartialtopics,theknowledgelevelissatisfactoryandcontinuouslyextended.
Asfarasthelimestonecementconcreteisconcerned,thefewavailablereferencesarefocusedontwoareas.Thefirstoneistheefectoflimestoneontheconcretepropertiesandbehavior[23-29].Thesecondonedealswiththe''thaumasiteproblem'',correlatedwiththeuseoflimestonecementconcreteandcalcareousaggregates.RecentresearchworkshowsthatPortlandlimestonecementpastesaresusceptibletothethaumasiteforma-tion,duetosulfateattackat5℃,afteronlyafewmonthsexposuretosulfatesolutions[30-35].
InthispaperthemainfactorsafectingthepropertiesofPortlandlimestonecementsareevaluated,whilethehydrationbehaviorofthelimestonecementsisexamined.Inaddition,theintergrindingprocess,concerningtheproductionofthelimestonecements,isstudied.Finallythepropertiesandthebehavioroflimestonecementconcreteaswellasthecorrosionbehavioroflimestonecementmortarareinvestigated.Thisworkisapartofaproject,developedinourlaboratories,concerningthepropertiesoflimestonecementandconcrete.
2.Intergrindingofclinkerandlimestone
OrdinaryPortlandclinkerofindustrialoriginandlimestoneofhighcalcitecontent(CaCO3:
95.3%)wereused(Tables1and2).Fourclinker/limestonemixtures,containing10%,20%,30%and40%limestone,respectively,weregroundtofourdiferentfinenesseachoneinapro-pilotplantballmill(16samplesCLi-jofTable3).
Table1Chemicalandmineralogicalcompositionofclinker
Table2Chemicalcomposition(%)oflimestone
Table3Particlesizedistribution(passing%)ofclinker,limestoneandmixture
aCLi-j:
C:
clinker,L:
limestone,i:
limestonecontent(%),j:
grindingtime(A¼35min,B¼50min,C¼65min,D¼85min).
bCEM:
mixture(cement).
cS:
specificsurface(Blaine),n:
uniformityfactorofRRdistribution.
Inordertodeterminetheparticlesizedistributionofclinkerandlimestoneaftertheirintergrinding,asedimentationmethod(Andreasenapparatus)wasused.Asampleofeachmixturewaswelldispersedinabsoluteethylalcohol.Atpredefinedtimeintervalssampleswerewithdrawnusingapipet.Theselectedtimeintervalscorrespondtoparticlesizeslessthan32,16,8and4lm.Thealcoholwasremovedbydryingandthelimestonecontentwasdeterminedbymeasuringthelossofignition(LOI)at1000℃.Finally,theparticlesizedistributionofclinkerandlimestonewascomputed.
TheRosin-Rammlerdistributionwasusedforde-scribingtheparticlesizedistributionoftheintergroundsamples.ThevaluesoftheuniformityfactorðnÞhavebeencomputed(Table3).Itisseenthattheincreaseofthelimestonecontent,aswellastheincreaseofthece-mentfineness,leadstowiderparticlesizedistribution.Theparticlesizedistributionoftheclinkerissignificantlydiferentthanthatofthemixture.Thelimestoneisconcentratedinthefinefractions(<8lm),whiletheclinkerisconcentratedinthecoarserfractions.Fig.1presentslimestoneandclinkercontentsofthediferentsizefractions.Itisseenthatthelimestonecontentinthefractionwithsizelessthan4lmis24.8%andtheclinkercontentis75.2%.Itmustbenoticedthattheinitialsamplecontains20%limestoneand80%clinker.However,thesizefractiongreaterthan56lmcontainsonly12%limestone.
AccordingtodatagiveninTable3,theincreaseofthemixturefinenessinfluencestheclinkerfinenessbutnottoasignificantdegree.Inaddition,alimestonecontentover30%obstructsthegrindingofbothclinkerandreducedclinkerandlimestonefinenesses,comparedwiththosecontaining30%.
AlltheaboveresultsshowthattheparticlesizedistributionofthePortlandlimestonecements,aswellasthefinenessesofclinkerandlimestone,isstronglycon-nectedwiththelimestonecontentandthefinenessofthemixture.InordertoproduceaPortlandlimestonecementofdesiredproperties,thegrindingtohigherfine-ness(comparedwiththepurecements)istheeasyway,buttheproperoneistodefinetheoptimumfinenesslevel,takingintoaccountthelimestonecontentandthegrindingpropertiesofthecomponents.
3.PropertiesofPortlandlimestonecements
Portlandlimestonecementswereproducedbyinter-grindingofclinker(Table1),limestone(Table2)andgypsuminapro-pilotplantballmillof5kgcapacity.Thecompositionandthepropertiesofthecementstes-tedaregiveninTable4.
Fig.2showstheinfluenceoflimestonecontentonthestrengthdevelopmentofCL-c-45.Itisobservedthattheadditionof10%limestonedoesnotsignificantlyalterthecompressivestrengthatanyageofsampleshavingfinenessupto3800cm2=g.Furtherincreaseofthecementfinenessleadstotheproductionoflimestonecementshavingcompressivestrengthlowerthanthepureones.Ingeneral,theinfluenceofthefinenessonthecompressivestrengthisstrongerforlimestoneadditionupto10%.
Table4alsopresentsthecementpastewaterdemand,thesettingtimeandtheexpansionofthetestedsamples.Thelimestonecements,despitetheirhigherfineness,generallydemandlesswaterthantherelativepurecements.Inlimestonecementscontaining10%limestone,thereisareductionofwaterdemandfrom26%to25%.Theincreaseofthelimestonecontentto20%and35%causesadecreaseofthewaterdemandto23.5-22.8%.Theefectoflimestoneonthepastewaterdemandofcementscanbeattributedtothediferentparticlesizedistributionsofthesamples.Limestonecementsdespitetheirhigherfinenesshavewiderparticlesizedistributions-lowervalueofuniformityfactor(n)oftheRosin-Rammlerdistribution-comparedwithPortlandcements(Table4).Thisisduetotheintergrindingofaneasy-groundmaterialsuchaslimestonewiththeclinker.
Theinitialandfinalsettingtimesoflimestonecements(Table4)aresimilartothoseofthePortlandcements.Thesoundnessofthelimestonecements(Table4)issatisfactory.TheexpansionmeasuredaccordingtotheLeChatelierprocessvariesfrom0.5to1.5mmwhilethelimitaccordingtoEN197-1is10mm.
Fig.1.Limestone(L)andclinker(C)contentindifferentsizefractionsaftertheirintergrinding(mixturefineness:
3890cm2/g,limestonecontent:
20%).
4.HydrationofPortlandlimestonecements
Limestonecementscontaining0%,10%,20%and35%w/wlimestonewereexamined(samplesC-45,CL10-45,CL-20-45andCL-35-45ofTable4).ThepropertiesofthestudiedcementsaregiveninTable4.
Pasteswerepreparedbymixingsolidandcarbondioxide-freedistilledwaterinpolyethylenevialssubjectedtorotationfromtimetotime.Thewater-to-cementratiousedis0.3.Afterperiodsof1,2,7and28days,thesamplesweredriedinvacuumfor24handsubjectedtoX-raydifraction.Thermogravimetricanalysis(TGA)wasusedforthedeterminationofnon-evaporablewaterandcalciumhydroxidecontentindriedcementpastes,usingaTAInstrumentsThermalAnalyst3000.Thesamples(_50mg)wereheatedovertherange20-900℃ataconstantrateof15℃/mininanatmosphereofcarbondioxide-freenitrogen,flowingin90cm3/min.
Tabl
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