Abstract:
Lithiumslagisusedasasupplementarycementitiousmaterialincement⁃basedmaterialsdue toitspozzolanicactivity,butitslowerhydrationactivityleadstoadeclineinthemechanicalproperties anddurabilityofthecement⁃basedmaterial*Inthispaper,forthelowdegreeofhydrationoflithiumslag incompositecementitiousmaterials,aninorganicpolymeraluminumwasusedasanactivatortoimprove thehydrationactivityoflithiumslag*Theeffectsandmechanismofpolymericaluminumonhydration hardeningof lithium slag⁃cement composite cementitious materials were investigated through macro propertiesofcompressivestrengthandnon⁃evaporablewatercontent,andmicrocharacteristicsofhydra⁃ tionheat,mineralcompositionofhydrationproductsandBSEmicroscopicmorphology*Theresultsindi⁃ catethattheadditionofpolymericaluminumsignificantlyimprovesthecompressivestrengthandnon⁃e⁃
vaporablewater content in the lithium slag⁃cement composite cementitious material,which increases 26*8% and5% respectivelyinthe28dperiod*Intheearlyhydration,polymericaluminumaccelerates themineralphasedissolutionandcrystalgrowthinthelithiumslag⁃cementcompositecementitiousma⁃ terial,andincreasesthetotalnucleationofhydrationproducts*Alargenumberofettringite,hydration calciumaluminates,calciumhydroxideandamorphoushydrationgelsappeareinthehydrationproducts, whichpromotehydrationoflithiumslag⁃cementcompositecementitioussystem,thedissolutionandero⁃ sionoflithiumslagparticles*