高性能水泥基復(fù)合型材的制備及其性能研究.pdf

1、東南大學(xué)碩士學(xué)位論文高性能水泥基復(fù)合型材的制備及其性能研究姓名：余保英申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：材料科學(xué)與工程；材料學(xué)指導(dǎo)教師：張亞梅201103AbstractAbstractInrecentyears，thecontributionofflyash，slagandothermineraladmixturesontheconcreteproperties，especiallythedurabilityisgraduallybeingre

2、cognizedmineraladmixturesarewidelyusedinavarietyofstructuralengineeringTotakefulladvantageofthepozzolanicactivityofmineraladmixturesandotherexcellentperformances，higlllyactivemineraladmixturessuch私ultrafineslagarealsobei

3、ngrecommendedtocivilengineeringapplicationsInthispaperultrafineslagisbeingusedtopreparehighperformancecementbasedcompositematerialboardsTaketheboardsaspermanentformworksofconcrete，preparecementbasedpermanentformwork／conc

4、retecompositebeams，andconductexploratoryresearchThemaincontentsareasfollows：ThemechanicalperformanceofcementbasedmaterialincorporatedwithultrafineslagsilicafumeandordinaryslagareinvestigatedThehydrationproductsporesizean

5、dporosityofcementbasedmaterialaretestedwithXRDandMIPseparatelyThelowpeakintensityofCa(OH)2obtainedfromXRDanalysisshowthatultrafineslagwithsignificantlysmallerparticlesizethanordinaryslaghashigherpozzalanicactivitythansil

6、icafumeandordinaryslagwhichsuggeststhattheadditionofultrafineslagCanpromotethehydrationprocessofcementbasedmaterialatearlyagesResultsfromMIPtestrevealthattheadditionofultrafineslagtocementpasteCanreducethecharacteristicp

7、oresizeandtheporosityoptimizetheporestructureandincreasethedensityofhardenedcementpaste，ultrafineslagcanbeusedtopreparehi曲earlystrengthandhi曲densecementmatrixBytestingthemechanicalpropertyshrinkage，impactresistanceandsta

8、ticbendingpropertyofcement—basedboardswithO％，l％and17％PVAfiberbyvolumefraction，itisfoundthatcementbasedboardswithhigherfibercontenthavebetterresistanceagaintshrinkage，impactresistanceandstaticbendingpropertiesSEMobservati

9、onconfirmsthattheinterfacebetweenhigh—strengthhi曲elasticmodulusPVAfiberandcementmatrixhasgoodbondingproperties，whichCanimprovethemechanicalpropertyandimpactresistance；SEMmorphologyclearlyshowsthatPVAfibcrisfracturedwithq

10、uiteirregularfracturesurfaceincementbasedmatri)【theseindicatePVAfiberabsorbsagreatdealofenergyinfailureprocessandhelptoimprovethetoughnessofboards；Themonitoringofacousticemissionproofsthattheacousticemission(AE)signalsof

11、cement—basedboardwith17％fiberarclessthantheothercementbasedboards，whichmainlyattributetothehighacousticabsorptionabilityandstressreleasingeffectoffiberFlat—shapesmallscalepermanentformworksmadeofhighperformancecementbase