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ID:11648033
大小:35.50 KB
页数:13页
时间:2018-07-13
《气硬性胶凝材料(air-hardening binding material)》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
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
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