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1、Cement&ConcreteComposites32(2010)142–147ContentslistsavailableatScienceDirectCement&ConcreteCompositesjournalhomepage:www.elsevier.com/locate/cemconcompCompressivestrengthandmicrostructuralcharacteristicsofclassCflyashgeopolymeraa,*bXiaoluGuo,HuishengShi,WarrenA.DickaKeyLaboratoryofAdvancedCivilEn
2、gineeringMaterials(TongjiUniversity),MinistryofEducation,1239SipingRoad,Shanghai200092,ChinabSchoolofEnvironmentandNaturalResources,TheOhioStateUniversity,1680MadisonAvenue,Wooster,OH44691-4096,USAarticleinfoabstractArticlehistory:GeopolymerspreparedfromaclassCflyash(CFA)andamixedalkaliactivatorof
3、sodiumhydroxideandReceived8June2009sodiumsilicatesolutionwereinvestigated.AhighcompressivestrengthwasobtainedwhenthemodulusReceivedinrevisedform1November2009oftheactivatorviz.,molarratioofSiO2/Na2Owas1.5,andthepropercontentofthisactivatorasevalu-Accepted3November2009atedbythemassproportionofNa2Ot
4、oCFAwas10%.ThecompressivestrengthofthesesampleswasAvailableonline10November200963.4MPawhentheywerecuredat75°Cfor8hfollowedbycuringat23°Cfor28d.InFTIRspectroscopy,1themainpeaksat1036and1400cmhavebeenattributedtoasymmetricstretchingofAl–O/Si–OKeywords:1bonds,whilethoseat747cmareduetotheSi–O–Si/Si
5、–O–Albendingband.ThemaingeopolymericGeopolymergelandcalciumsilicatehydrate(C–S–H)gelco-existandbondsomeremainingunreactedCFAspheresClassCflyashasobservedinXRDandSEM–EXDA.Thepresenceofgismondine(zeolite)wasalsoobservedintheCompressivestrengthMicrostructuralcharacteristicsXRDpattern.Ó2009ElsevierLtd
6、.Allrightsreserved.1.IntroductionavailablequantitiesofclassCflyash(CFA).However,therehavebeenveryfewpublishedpapersonclassCflyashgeopolymerManufacturingofPortlandcementisaresourceexhausting,en-(CFAG).CFAhasnotbeensubjectedtothesamelevelofanalysisergyintensiveprocessthatreleaseslargeamountsofthegree
7、nintheliteratureasFFA[7,8].housegasCO2intotheatmosphere.Productionof1tonofPortlandFromacompositionalviewpoint,themaindifferencebetweencementrequiresabout2.8tonsofrawmaterials,includingfuelandCFAandFFAisthecalciumconten
