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1、南京工业大学硕士学位论文镁质混凝土膨胀剂效能的研究姓名：钟业盛申请学位级别：硕士专业：材料科学与工程、材料学指导教师：姚晓20060520硕士学位论文型、数量、分布、形貌及其演变规律进行实验研究，并对其相应的膨胀机理、膨胀混凝土的补偿收缩原理以及不同类型膨胀剂的水化作用和特点做出初步解释。关键词膨胀剂混凝土膨胀指数补偿收缩微结构IIAbstractAbstractWiththedevelopmentofsciencetechnology,oneofthemostbroadlyusedconstructionmaterialsisconcrete,concretehasbeenstudie
2、danditscomprehensivepropertyhasalsodevelopedandmoreandmore.Duringthecourseofhydration,theconcretestrengthincreasescompaniedwiththeshrinkagedistortion,andthetensile/comprehensionstrengthratioareverylow,soitiseasyfortheconcretetogeneratecrack.Inrecentyears,withthehigh-strengthandhigh-performanceofc
3、oncrete,extensiveuseofchemicaladditiveandmineraladmixture,theappearanceprobabilityofcrackinconcreteconstructionincreasedgreatly.Therefore,thepreventionandcureofconcretecrackhasbeenafocuslonginvestigatedintheconstruction.Now,themosteffectivewaytopreventandreducetheconcretecrackistoaddproperquantit
4、yexpansiveadditiveinconcreteadmixture.Firstly,Inthepaper,thepresentstudyingstatusanddevelopingtendencyoftheconcreteexpansiveadditivearesummarizedintheforeignanddomesticcountry.AnditisindicatedthattheappliedtechnologyofaddingMgOexpansivehasbeensuccessfullyusedinmassconcreteandlargedamconcrete.Thee
5、xpansivemechanismofthreekindsofadditives,suchasEttringite,CaOandMgOexpansiveadditive,isintroducedindetailed.Morethanthat,themeritsandfaultsofeachexpansiveadditiveareoverviewed.Basedonthattheconcreteshrinkageisalongprocedure,itisverynecessarytohaveakindofnewcompoundadditivewithdoubleexpansiveresou
6、rce,whichcansatisfyboththerequirementofexpansivevalueinearlystageandshrinkagecompensationinthefinalstage.Therefore,theinfluenceonthemechanicalproperty,expansivepropertyanddevelopingcompatibilityofstrengthisinvestedwhenconsideringaddingjustmagnesiaexpansiveandcompoundmagnesiaexpansiveincommonconcr
7、ete.Secondly,theresourceandpropertyparametersofthelawmaterialsusedintheexperimentareintroduced.Andthemainexperimentmethods,whichinvolvedin-III-硕士学位论文testingthelimitedexpansionandstrengthpropertyofmortar,expansionindex,
