蒸养条件下偏高岭土对钢渣水泥基复合体系水化的影响  

The Influence of Metakaolin on the Hydration of Steam-cured Steel Slag Blended Cement

作　　者：黄时玉 霍彬彬 陈春[1] 张亚梅[1] HUANG Shiyu;HUO Binbin;CHEN Chun;ZHANG Yamei(Jiangsu Key Laboratory of Construction Materials,School of Materials Science and Engineering,Southeast University,Nanjing 211189,China)

机构地区：[1]东南大学材料科学与工程学院,江苏省土木工程材料重点实验室,南京211189

出　　处：《材料导报》2022年第5期69-74,共6页Materials Reports

基　　金：国家自然科学基金项目(51778132);2020年度江苏省“333工程”科研资助项目(BRA2020221)。

摘　　要：研究了偏高岭土对蒸养(60℃蒸养12 h)钢渣水泥基材料早期水化和力学性能的影响。结果表明:复掺偏高岭土后,蒸养钢渣偏高岭土复合水泥胶砂的力学性能显著提高,最佳掺量下能够与纯水泥胶砂的力学性能持平。偏高岭土加速了蒸养钢渣水泥的早期水化,并加速了硫酸盐消耗,促进AFm相的形成。蒸养钢渣-偏高岭土复合水泥体系中C-S-H和C-A-S-H凝胶量增多,生成碳铝酸盐相固定活性Al_(2)O_(3),有利于稳定钙矾石相。同时,偏高岭土显著改善了蒸养钢渣水泥体系的孔隙分布,使基体更加密实。The effects of metakaolin on early hydration and mechanical properties of steam-cured steel slag blended cement-based materials(steam-cured at 60℃for 12 h)were investigated.The results show that,with the incorporation of metakaolin under the optimum dosage,the mechanical strength of steam-cured steel slag blended cement mortar is significantly enhanced,which is comparable to that of pure cement mortar.The early hydration process of steam-cured steel slag blended cement is accelerated with metakaolin,as well as the consumption of sulfate,lea-ding to the formation of AFm phases.The amount of C-S-H and C-A-S-H gel of steam-cured ternary Portland cement blends containing steel slag and metakaolin is increased while carbon aluminate is observed to fix active Al_(2)O_(3),which is beneficial to the stability of ettringite.Additionally,the pore distribution of steel slag blended cement containing metakaolin under steam curing is refined,leading to a denser matrix.

关 键 词：蒸汽养护 钢渣 偏高岭土 水泥 水化特征 孔结构 

分 类 号：TU528[建筑科学—建筑技术科学]