硅锰渣-固硫灰复合辅助性胶凝材料水化机理研究

硅酸盐通报 ›› 2022, Vol. 41 ›› Issue (5): 1715-1723.

硅锰渣-固硫灰复合辅助性胶凝材料水化机理研究

刘强^1,2, 周飞³, 张俊瑾³, 卢忠远¹, 胡骏³, 李晓英², 侯莉⁴, 陈雪梅^1,5, 钟文⁵, 李军¹

1.西南科技大学,环境友好能源材料国家重点实验室,绵阳 621010;
2.西南科技大学,材料科学与工程学院,绵阳 621010;
3.成都蜀源港泰新型建材有限公司,成都 611700;
4.西南科技大学,土木工程与建筑学院,绵阳 621010;
5.嘉华特种水泥股份有限公司,乐山 614003

收稿日期:2022-01-13 修回日期:2022-03-14 出版日期:2022-05-15 发布日期:2022-06-01
通讯作者: 李军,博士,副研究员。E-mail:lijun@swust.edu.cn
作者简介:刘强(1996—),男,硕士研究生。主要从事水泥基胶凝材料的研究。E-mail:lq961128@163.com
基金资助:
四川省科技计划项目(2019ZDZX0024)

Hydration Mechanism of Silicomanganese Slag-Circulating Fluidized Bed Combustion Ash Composite Supplementary Cementitious Materials

LIU Qiang^1,2, ZHOU Fei³, ZHANG Junjin³, LU Zhongyuan¹, HU Jun³, LI Xiaoying², HOU Li⁴, CHEN Xuemei^1,5, ZHONG Wen⁵, LI Jun¹

1. State Key Laboratory of Environment Friendly Energy Materials, Southwest University of Science and Technology, Mianyang 621010, China;
2. School of Materials Science and Engineering, Southwest University of Science and Technology, Mianyang 621010, China;
3. Chengdu Shuyuan Gangtai New Building Materials Co., Ltd, Chengdu 611700, China;
4. School of Civil Engineering and Architecture, Southwest University of Science and Technology, Mianyang 621010, China;
5. Jiahua Special Cement Co., Ltd, Leshan 614003, China

Received:2022-01-13 Revised:2022-03-14 Online:2022-05-15 Published:2022-06-01

摘要/Abstract

摘要： 早期水化活性过低是限制冶炼渣在胶凝材料体系中大掺量应用的重要因素之一。利用固硫灰(CFBA)中的硫酸盐激发硅锰渣(SM)水化活性,并研究硅锰渣-固硫灰复合辅助性胶凝材料的水化过程及活性发展。结果表明:随着固硫灰掺量增加,胶砂流动度大幅下降,但其早期和后期活性得到有效提升;当固硫灰掺量为10%(质量分数)时,复合辅助性胶凝材料3 d、7 d和28 d活性指数分别达到61%、71%和95%,均高于单独使用硅锰渣体系(3 d、7 d和28 d活性指数分别为50%、53%和81%)。固硫灰的掺入激发了水泥和辅助性胶凝材料的早期水化,延缓了水化过程中钙矾石转变为单硫型水化硫铝酸钙(AFm),使得胶凝材料早期水化形成更多钙矾石。

关键词: 硅锰渣, 固硫灰, 复合辅助性胶凝材料, 活性指数, 水化, 流动性

Abstract: Lower early hydration activity is one of the important factors limiting the application of higher content smelting slag in the cementitious materials system. In this study, silicomanganese slag (SM) was activated by sulfate in circulating fluidized bed combustion ash (CFBA), and the hydration process and activity development of SM-CFBA composite supplementary cementitious materials were studied. Results show that the fluidity of mortars prepared by using SM-CFBA composite supplementary cementitious materials decreases significantly with the increase of CFBA. However, early and later activity of SM-CFBA composite supplementary cementitious materials are effectively improved with the increase of CFBA. When the content of CFBA is 10% (mass fraction) in SM-CFBA composite supplementary cementitious materials, 3 d, 7 d, and 28 d strength activity indexes of them reach 61%, 71%, and 95%, respectively, which is higher than those of SM (3 d, 7 d, and 28 d strength activity indexes are 50%, 53%, and 81%, respectively). The incorporation of CFBA stimulates the early hydration of cement and supplementary cementitious materials, and delays the transformation of ettringite into monosulfur-type hydrated calcium sulfoaluminate (AFm) during the hydration process, which allows early hydration of the cementitious materials to form more ettringite.

Key words: silicomanganese slag, circulating fluidized bed combustion ash, composite supplementary cementitious material, activity index, hydration, fluidity

中图分类号:

TQ172

刘强, 周飞, 张俊瑾, 卢忠远, 胡骏, 李晓英, 侯莉, 陈雪梅, 钟文, 李军. 硅锰渣-固硫灰复合辅助性胶凝材料水化机理研究[J]. 硅酸盐通报, 2022, 41(5): 1715-1723.

LIU Qiang, ZHOU Fei, ZHANG Junjin, LU Zhongyuan, HU Jun, LI Xiaoying, HOU Li, CHEN Xuemei, ZHONG Wen, LI Jun. Hydration Mechanism of Silicomanganese Slag-Circulating Fluidized Bed Combustion Ash Composite Supplementary Cementitious Materials[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(5): 1715-1723.

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