碱激发矿粉-粉煤灰-偏高岭土地聚物水化行为和力学性能

硅酸盐通报 ›› 2023, Vol. 42 ›› Issue (6): 2106-2114.

所属专题：资源综合利用

碱激发矿粉-粉煤灰-偏高岭土地聚物水化行为和力学性能

刘刚^1,2, 丁明巍^1,2, 刘金军², 万惠文¹, 薛永杰¹, 蹇守卫^1,2

1.武汉理工大学硅酸盐建筑材料国家重点实验室,武汉 430070;
2.武汉理工大学材料科学与工程学院,武汉 430070

收稿日期:2023-03-27 修订日期:2023-03-27 出版日期:2023-06-15 发布日期:2023-06-25
作者简介:刘刚(1981—),男,教授。主要从事道路新材料研发、固废循环利用方面的研究。E-mail:liug@whut.edu.com
基金资助:
海南省科技计划三亚崖州湾科技城联合项目(520LH016);湖北省科学技术厅重点研发计划(2021BCA126)

Hydration Behavior and Mechanical Properties of Alkaline Excited Slag-Fly Ash-Metakaolin Geopolymer

LIU Gang^1,2, DING Mingwei^1,2, LIU Jinjun², WAN Huiwen¹, XUE Yongjie¹, JIAN Shouwei^1,2

1. State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070, China;
2. School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China

Received:2023-03-27 Revised:2023-03-27 Online:2023-06-15 Published:2023-06-25

摘要/Abstract

摘要： 通过改变矿粉、粉煤灰、偏高岭土的配合比,用复配后的水玻璃进行碱激发,制备三元地聚物,测试了三元地聚物凝结时间以及抗折、抗压强度。利用XRD、SEM、EDS及DTG研究硬化浆体中水化产物的形貌和成分,并对水化过程进行分析。结果表明,该三元地聚物是由原材料在碱激发水化作用下生成的以水化硅酸钙(C-S-H)、水化硅铝酸钙(C-A-S-H)和水化硅铝酸钠(N-A-S-H)凝胶为主的复合胶凝材料。矿粉掺量越高,新拌浆体凝结时间越短,水化产物中钙系凝胶越多,试件强度越高。矿粉含量为10%、30%、50%、70%、90%(质量分数)的5组试件3 d抗压强度分别为2.1、14.1、24.2、29.7、37.9 MPa。养护龄期越长,反应越完全,水化产物越多,试件抗压强度越高。当矿粉含量为50%时,三元地聚物1、3、7、28 d抗压强度分别为12.3、24.2、27.3、36.8 MPa。当矿粉含量为90%、养护龄期为28 d时,试件抗折、抗压强度最高,分别为12.0、52.0 MPa。该体系较短的凝结时间使其在道路修补材料及3D打印等领域有着较为广阔的应用前景。

关键词: 矿粉, 粉煤灰, 地聚物, 强度, 微观形貌, 水化过程

Abstract: By changing the ratio of slag, fly ash and metakaolin, the ternary geopolymer was prepared by alkali excitation with the compound sodium silicate. The setting time, flexural and compressive strength of ternary geopolymer were tested. XRD, SEM, EDS and DTG were used to study the morphology and composition of hydration products in the hardened paste, and the hydration process was analyzed. The results show that the ternary geopolymer is composed of calcium silicate hydrate (C-S-H), calcium aluminate silicate hydrate (C-A-S-H) and sodium aluminate silicate hydrate (N-A-S-H) gels. The higher the slag content is, the shorter the setting time of newly mixed slurry is, the more calcium gel in the hydration products is, and the higher the strength of specimen is. The 3 d compressive strength of 5 groups of specimens with slag content of 10%, 30%, 50%, 70%, 90% (mass fraction) is 2.1, 14.1, 24.2, 29.7, 37.9 MPa, respectively. The longer the curing period is, the more complete the reaction is, the more hydration products are, and the higher the strength of specimen is. When the slag content is 50%, the compressive strength of ternary geopolymer at 1, 3, 7, 28 d is 12.3, 24.2, 27.3, 36.8 MPa, respectively. When the slag content is 90% and the curing age is 28 d, the flexural and compressive strength of specimen are the highest, which are 12.0, 52.0 MPa, respectively. The short setting time of the system makes it have a broad application prospect in the field of road repair materials and 3D printing.

Key words: slag, fly ash, geopolymer, strength, microstructure, hydration process

中图分类号:

TU528

刘刚, 丁明巍, 刘金军, 万惠文, 薛永杰, 蹇守卫. 碱激发矿粉-粉煤灰-偏高岭土地聚物水化行为和力学性能[J]. 硅酸盐通报, 2023, 42(6): 2106-2114.

LIU Gang, DING Mingwei, LIU Jinjun, WAN Huiwen, XUE Yongjie, JIAN Shouwei. Hydration Behavior and Mechanical Properties of Alkaline Excited Slag-Fly Ash-Metakaolin Geopolymer[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(6): 2106-2114.

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碱激发矿粉-粉煤灰-偏高岭土地聚物水化行为和力学性能

Hydration Behavior and Mechanical Properties of Alkaline Excited Slag-Fly Ash-Metakaolin Geopolymer

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