聚合铝对锂渣-水泥复合胶凝材料水化硬化特性的影响

Effect of polymeric aluminum on hydration hardening characteristics of lithium slag⁃cement composite cementitious materials

  • 摘要: 锂渣具有火山灰活性,可作为辅助性胶凝材料应用于水泥基材料中,但其较低的水化活 性导致材料的力学性能和耐久性能下降。 针对锂渣在复合胶凝材料中的低水化程度,本文采用 一种无机高分子聚合铝作为激发剂来提升锂渣的水化反应活性,通过测定材料的胶砂强度、化学 结合水量等宏观性能,并结合水化放热特性、水化产物矿物组成及背散射显微形貌等微观表征, 分析了聚合铝对锂渣-水泥复合胶凝材料水化特性的影响及作用机理。 结果表明:聚合铝的掺入 显著提高锂渣-水泥复合胶凝材料28d龄期的抗压强度和化学结合水含量,分别增长了26*8% 和5%;早期水化反应中,聚合铝的掺入加速了锂渣-水泥复合胶凝体系的矿物相溶解和晶体的生 长,增加了水化产物的成核总量,水化产物中出现了大量的钙矾石、水化铝酸钙、氢氧化钙及非晶 态水化凝胶;聚合铝的掺入促进了锂渣-水泥复合胶凝体系的水化和锂渣颗粒的溶解与侵蚀。

     

    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*

     

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