復(fù)合改性磷石膏做水泥調(diào)凝劑的研究.pdf

1、武漢理工大學(xué)碩士學(xué)位論文復(fù)合改性磷石膏做水泥調(diào)凝劑的研究姓名：周麗娜申請學(xué)位級別：碩士專業(yè)：建筑材料與工程指導(dǎo)教師：沈衛(wèi)國20070501武漢理工大學(xué)碩士學(xué)位論文ABSTRCTPhosphogypsum(PO)isabyproductofphosphoricacidandsomecompoundwashingproductindustryThemaincompositionofPGisCaS042H20，whosecontentishi

2、曲erthantheaveragelevelofnaturalgypsumThispapercomparedtheeffectofPGandNGonthepropertyofcementfirstlyTheresultsshowedthatthecementmixedwithPGhaslongersettingtimethantheonemixedwithNGThemainisPGhassolublephosphatesAccordin

3、gtotheprinciplesandmethodsofmaterialscienceitisproposedtocombinethePG謝出limeandflyaslatomakethePGreplacenaturalgypsum(NG)Comparingtothetraditionaltreatmentofwashingandmixing謝thslakedlimethismethod(modifiedPGⅣ毋Gforshort)is

4、moreeffeetiveChoosingPGandNGasguidesampleofcementretardation，searchedthebestbatchformulaoftheclinkerandMPO，andgetthesettingtimeandstrengthoftheeement，whichusetheMPGas“純田dationTestedthecontentofphosphateandthesolublephosp

5、hateandfil】orine，byusingfluorineionelectrodeandICP(InductionCouplingPlasmapump)，andresearchedthelevelofactionofflyashinMPGbytheScanningElectronicMethod(SEM)Studytheinfluenceofdifferentcontentsofphosphateandlimeonhydratio

6、nofPortlandcementusinganoncontactelectricalresistivitymeterTheresultsshowedthat：thePGcontentofphosphateandthesolublephosphateandfluorineandthephosphateandthesolublephosphatemakethesettingtimelongerwhilethefluorinehaslitt

7、leinfluenceoniLSomostPGCannotbeusedascementretardationandshouldbemodifiedThebestbatchformulaofMPGis‘‘Lime：flyash：PG=5：30：65”UsingthisMPG，thecementhasalmostthesalB_esettingtimeastheNG，anditsstreIlgthishigherthanthelatter，