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1、ReactionprocessofMgOSiO2H2Osystem:ThermodynamickiicanalysesZhaohengLi1TongshengZhang12JieHu12JiangxiongWei12?QijunYu121.SchoolofMaterialsScienceEngineeringSouthChinaUniversityofTechnologyGuangzhou510640China2.GuangdongLo

2、wCarbonTechnologiesEngineeringCenterfBuildingMaterialsSouthChinaUniversityofTechnologyGuangzhou510640ChinaAbstractIndertoclarifythereactionprocessofMgOSiO2H2Osystemthereactionproductsreactiondegreewereacterized.Furtherth

3、ereactionthermodynamicswascalculatedthereactionkiicswasdeduced.TheresultsindicatedthatalargeamountofMg(OH)2generatedalittlemagnesiumsilicatehydrate(MSH)gelfmedwiththedissolutionofMgO.MSHgelwasgeneratedgraduallyafterwardu

4、ntilsilicafume(SF)Mg(OH)2wasconsumedcompletely.ThefmationreactionofMSHgelisthemainreactioninMgOSiO2H2OsystemwhenthedosageofMgOislowerthan50%whilethefmationreactionofMg(OH)2isthemainreactionwhenthedosageofMgOishigherthan5

5、0%.BasedonthethermodynamiccalculationstheexperimentalresultsMSHgelismestablethanMg(OH)2thefinalproductstendtobeMSHgelratherthanMg(OH)2.BasedonthemeasuredvaluesthereactionkiicsofMgOfollows????????=1???????????????????????

6、????(R20.97).iginality1.ThereactionprocessofMgOSiO2H2Osystemwasclarifiedthecontentofreactionproductswerequantified.2.Thethermodynamiccalculationswereemployedtoverifytheexperimentalresultsthereactionkiicswasdeducedbyusing

7、measuredvalues.Keywds:MgOSiO2H2OsystemReactionprocessThermodynamicsKiics?Crespondingauth:jxwei@scut.Tel.Fax.:862087114137Table1ChemicalcompositionofthereactiveMgOSFusedinthepresentstudy.MaterialComposition(wt.%)Specificd

8、ensity(gcm3)BETspecificsurfacearea(m2g)SiO2MgOCaOK2ONa2OAl2O3P2O5SO3MgO0.2997.221.45––0.210.060.202.9651.60SF95.740.631.251.070.330.500.200.152.0316.04Note:–undetected.Fig.1ParticlesizedistributionsoftheMgOSFpowders.2.2.

9、Samplepreparation2.2.1MgOSFpastespreparationAccdingtothemixtureproptionslistedinTable2MgOSFpasteswerepreparedbymixingreactiveMgOSFwaterhomogeneouslythensealedinpolyethylenebagscuredatroomtemperature(251C).Table2Mixturepr

10、optionofMgOSFpastes.SampleIDMgO(wt.%)SF(wt.%)WCratioM0.2S0.840601.0M0.4S0.64060M0.5S0.54060M0.6S0.44060M0.8S0.22080Note:WCratiowatertocementitiousmaterials(MgOSF)ratiobymass.2.2.2MSHgelpreparationIndertoverifythedifferen

11、cebetweenreactionproductsofMgOSFpastesMSHgelMSHgelwithaMgSiratioof1.0wassynthesizedasreptedinliterature[18]:Mg(NO3)26H2OsolutionwasslowlyaddedinNa2SiO35H2Osolutionbystirringinathreeneckedflaskat0C.Theprecipitatedcomposit

12、ewasfilteredwashedusingultrapurewatertoremoveNaNO3ions.2.3Testingmethods2.3.1MeasurementofheatevolutionTheheatevolutionofMgOSFpastes(withwatertosolidsmassratioof1.0)wasmeasuredupto10daysat25CusingaTAMAirisothermalcalimet

13、eraccdingtoASTMC170209[23].2.3.2acterizationofreactionproductsMgOSFpastescuredafter1372890dayswerefirstfrozen(195C)byimmersioninliquidnitrogenf5minthendriedviafreezedryingtechnique[24].Xraydiffraction(X’PertProdiffractom

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