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1、WasteglassasanalternativealkalineactivatinthepreparationofalkaliactivatedmaterialsM.TresCarro1F.Puertas11.EduardoTrojaInstitutefConstructionSciences(IETccCSIC)CSerranoGalvache428033MadridSpainAbstractAlkaliActivatedMater

2、ials(AAMs)aregenerallyregardedasoneofthemosteffectivealternativestoCO2emissionintensivePtlcement.Theprimaryobjectiveofthepresentstudywastoexpletheviabilityofalkaliactivatingindustrialbyproductssuchasblastfurnaceslagflyas

3、hwithwasteglasstopreparenewcementitiousmaterials.Thepaperdescribesthemethodologydevelopedtoobtainanalternativealkalineactivatbasedonwasteglass.Pasteswerepreparedwithalkaliactivatedslag(AAS)flyash(AAFA)withanumberofactiva

4、ts.IntheAASsystemstheseincludedsolutionscontainingwaterglassNaOHNa2CO3wasteglass.Aconstantconcentration(5%bymassofslag)wasusedthroughout.Theactivatsintheflyashsystems(AAFA)were8MNaOH10MNaOH15%waterglass10MNaOHmixedwithwa

5、steglass.ThesemtarsweretestedfmechanicalstrengthpositythepasteswereacterisedwithFTIRXRD29Si27AlNMRBSEMEDX.Thedegreeofreactionwasalsodeterminedinallthesystemswith29SiNMR1:20HCl.Irrespectiveoftheigini.e.dissolvedwasteglass

6、commercialwaterglasstheSiintheAASAAFAsystemsexhibitedsimilarbehaviourthetwotypesofactivatyieldedpastesmtarswithcomparableacteristicsproperties.iginalityTheneedtominimisegreenhousegas(mainlyCO2)emissionshasdriventhepursui

7、tnotonlyofcementalternativestoPtlcement(asAlkaliActivatedMaterials(AAMs))butalsotoalternativeactivattocommercialsodiumsilicateswhosemanufactureisacterisedbyhighpowerdem.UrbanindustrialwasteglassasSiO2Na2Orichvitreousmate

8、rialscanbeusedaspartialtotalreplacementsfsuchcommercialsodiumsilicatesinthepreparationofMMs.Afterdissolutioninalkalinesolutionswasteglasscanactivateblastfurnaceslagflyashtogeneratenewcementitiousmaterialswithmicrostructu

9、repropertiesmechanicalstrengthcomparablestothoseobtainedwithcommercialwaterglass.Keywds:alkalinematerialswasteglassalternativeactivatswaterglassacterizationproperties1Crespondingauth:Tel34913020440Fax34913020700Glassisan

10、idealmaterialtoberecycledwhereoncerecycledtheirusecanhelpsaveenergyinpreparingnewglassesduetorequires26%lessenergyitislessexpensivereducesrawmaterialsemployedinthepreparationofglasses.Howeverthereisapercentagebetween1030

11、%ofthesewasteglassesarenotreallocatedtothepreparationofnewglasscontainersbecausetheyhavesomekindofimpuritieseithermetalceramictype.Theconstructionsectplaysanimptantroleinthereuseofthispercentageofwasteglassusingthemaspoz

12、zolanicadditionsinthepreparationofPtlcementinthepreparationofvitroceramiccompositestogetherwithotherindustrialwastebyproductssuchasflyashslagceramicdiscardsasaprimematerialfsynthesizingsolidsodiumsilicatespurifiedsilica.

13、Inthislaterapplicationveryrecentresearchbyourgroup(PuertasTresCarro2014Puertasetal.2012a2012bTresCarroetal.20142012)haveshownthatsodiumsilicatebasedurbanwasteglassmayserveasanactivecomponentinthepreparationofalkaliactiva

14、tedslag(AAS)flyash(AAFA)cements.TheoptimalconditionsofsolubilityconcentrationofionsmainlySiO2Al2O3havebeenestablishedwhichallowedustousethesesolutionsasanalternativeactivatinthepreparationofalkaliactivatedslagflyashpaste

15、s(PuertasTresCarro2014Puertasetal.2014TresCarroetal.2014).Withthiswkwewanttoshowthattheuseofwasteglassasactivatinaluminosilicatematerialscaniginatesystemswithverysimilarmechanicalperfmancethanwhenacommercialsodiumsilicat

16、e(waterglass)isused.2.Experimental2.1.RawMaterialsInthisstudywereusedasstartingrawmaterialsanurbanindustrialwasteglassatypeFflyashSpanishvitreousblastfurnaceslag.Table1givesthechemicalcompositionofallmaterials.Thevitreou

17、sphaseaccountedf99%oftheslagcontentspecificsurfaceofthismaterialwas325m2kg.Thefollowingactivatingsolutionsallataconstant5%Na2Obyslagmasswereused(PuertasTresCarro2014TresCarroetal.2014):?5050molarsolutionofNaOHNa2CO3(Panr

18、eacanalyticalgrade98%sodiumhydroxide99.8%sodiumcarbonate)yieldingasolutionwithapHof13.6.?Commercialwaterglass(Merck27%SiO28%Na2O65%H2Obyweight)withaSiO2Na2Oratioof1.2.?5050molarsolutionofNaOHNa2CO3solutionswithdifferenta

19、mountsofdissolvedwasteglass(from1to25gper100mLofsolution).TheSiO2Al2O3ratiointheflyashwas≈2.Threealkalineactivatswereusedtoactivatetheflyash:NaOH8MNaOH10M15%ofwaterglassasolutionofNaOH10Mmixedwithdifferentproptionsofwast

20、eglass(101525gper100mLofsolution)(TresCarroPuertas2015).Theafementionedamountsofglass(particlesizeofunder45m)weremixedwiththesolutions(NaOHNa2CO3fblastfurnaceslagNaOH10Mfflyash)magicallystirredat802Cf6hours.Thesolutionwa

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