蒸养条件下偏高岭土对钢渣水泥基复合体系水化的影响

doi:10.11896/cldb.21010187

材料导报

2022, Vol. 36

Issue (5): 21010187-6 https://doi.org/10.11896/cldb.21010187

无机非金属及其复合材料

蒸养条件下偏高岭土对钢渣水泥基复合体系水化的影响

黄时玉, 霍彬彬, 陈春, 张亚梅

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

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

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

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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Al₂O₃,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。

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关键词: 蒸汽养护钢渣偏高岭土水泥水化特征孔结构

Abstract: The effects of metakaolin on early hydration and mechanical properties of steam-cured steel slag blended cement-based materials (steam-cured at 60℃ for 12h) 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 Al₂O₃, 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.

Key words: steam-cured steel slag metakaolin cement hydration characteristic pore structure

出版日期: 2022-03-10 发布日期: 2022-03-08

ZTFLH:

TU528

基金资助: 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)

通讯作者: ymzhang@seu.edu.cn

作者简介: 黄时玉,东南大学材料科学与工程学院,硕士研究生,主要研究方向为钢渣基复合胶凝材料。
张亚梅,东南大学结构工程专业博士,东南大学材料科学与工程学院教授、博士研究生导师,江苏省先进土木工程材料协同创新中心副主任。1990年毕业于东南大学土木系获学士学位,1998年毕业于东南大学材料系获博士学位。曾任江苏省土木工程材料重点实验室常务副主任。现为ACI CC(美国混凝土学会中国分会)理事,SAC(中国国家标准化委员会)注册ISO TC71专家,中国混凝土与水泥制品协会固废分会建筑固废专委会主任委员,中国土木工程学会再生混凝土分会副主任委员,中国硅酸盐学会水泥化学分会委员,中国混凝土与水泥制品协会预制混凝土构件分会理事,FIB (The International Federation for Structural Concrete) TG3.10委员,FIB com.9委员;Cement and Concrete Composite期刊编委;日本可持续发展协会客座研究员。负责或参与国家自然科学基金项目、973项目子题、重大工程技术攻关项目及企业合作项目等40多项,曾获教育部科技进步二等奖、华夏建设科技一等奖等。研究方向为固体废弃物的资源化利用技术、碱激发胶凝材料、建筑节能新材料、高性能纤维增强水泥基复合材料等。

引用本文:

黄时玉, 霍彬彬, 陈春, 张亚梅. 蒸养条件下偏高岭土对钢渣水泥基复合体系水化的影响[J]. 材料导报, 2022, 36(5): 21010187-6.
HUANG Shiyu, HUO Binbin, CHEN Chun, ZHANG Yamei. The Influence of Metakaolin on the Hydration of Steam-cured Steel Slag Blended Cement. Materials Reports, 2022, 36(5): 21010187-6.

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http://www.mater-rep.com/CN/10.11896/cldb.21010187 或 http://www.mater-rep.com/CN/Y2022/V36/I5/21010187

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