气硬性胶凝材料（air-hardening binding material）

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1、气硬性胶凝材料（air-hardeningbindingmaterial）AcollectionofcivilengineeringmaterialsThesecondchapterisaboutthebasicpropertiesofmaterialsNouninterpretationCementitiousmaterialair-hardeningbindingmaterialHydrauliccementitiousmaterialGypsumAnhydritePlasterofParisSettinghardeningA

2、lphahemihydrategypsumBetahemihydrateTwowatergypsumHemihydrategypsumHighstrengthgypsumQuicklimeSlakedlimesiliceouslimeMagnesianlimeUnder-burntlimeBurntlimeLimedigestionLimeChenFuGroundlimeLimemilkLimesoilConcreteXylolitewaterglassWaterglassmodulusTodeterminetheproblem(

3、ofthetick,wrongrow*)Therigidcementitiousmaterialcanonlybehardenedinair,whilethehydrauliccementitiousmaterialcanonlybehardenedinwater.Whenlimeisaged,thelimeslurryflowsintotheashstoragetankandneedstobeagedformorethantwoweeks.Themainpurposeistopreparelimepastewithgoodwor

4、kability,soastoensurethequalityofconstruction.Slakedlimeisdampintheairandremovedasslakedlime,anddoesnotaffecttheuse.Thecarbonationreactionequationoflimepasteinairis:Ca(OH)2+CO2=CaCO3+H2OThemostprominenttechnicalpropertyofconstructiongypsumiscondensation,hardening,anda

5、slightexpansioninhardening.Constructiongypsumboardbecauseofitshighstrength,soindecorationcanbeusedinhumidenvironment.Waterglassisgoodinwaterresistanceafterhardening,soitcanbepaintedonthesurfaceofgypsumproducts,soastoimprovethedurabilityofgypsumproducts.Thegreaterthemo

6、dulusnvalueofwaterglass,thegreateritssolubilityinwater.ThemolecularformofconstructiongypsumisCaSO42H2O.Becausetheplasteroftheordinarybuildinghasathickercrystal,itneedsmuchlesswaterthanahighstrengthbuildingplasterwhenitcomesintoaplasticpaste.Limeisusedtoreducetheamount

7、ofheatproducedduringlimeripening.Thedryingshrinkageoflimeislarge,whichisthemainreasonwhylimeisnotsuitablefortheproductionoflimeproductsandcomponentsalone.Limestoredinairfortoolongcanbeusedasusual.Limeisgascementingmaterial,sopreparedbylimeandlimeconcretewerenotusedfor

8、wetengineering.Magnesiteslowsettingandhardening,hardeningcanbeaddedtoNa2SiF6.Limecanbeusedindampconditions.Limecanbeusedinwa