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硅酸盐通报 ›› 2026, Vol. 45 ›› Issue (6): 2021-2033.DOI: 10.16552/j.cnki.issn1001-1625.2025.1224

• 资源综合利用 • 上一篇    下一篇

海水干湿循环下硅灰石-矿渣-偏高岭土地聚合物的性能与机理

王晓彬1(), 罗李亭1, 何梓湘1, 陈娟1,2()   

  1. 1.长江大学城市建设学院,荆州 434023
    2.中国科学院武汉岩土力学研究所,岩土力学与工程安全全国重点实验室,武汉 430071
  • 收稿日期:2025-12-08 修订日期:2026-01-13 出版日期:2026-06-15 发布日期:2026-07-14
  • 通信作者: 陈娟,博士,教授。E-mail:chenjuan9876@163.com
  • 作者简介:王晓彬(2001—),男,硕士研究生。主要从事地聚合物胶凝材料的研究。E-mail:wxb.stu@yangtzeu.edu.cn
  • 基金资助:
    岩土力学与工程安全全国重点实验室开放基金(SKLGME022028);湖北省自然科学基金(2023AFB804)

Performance and Mechanism of Wollastonite-Slag-Metakaolin Geopolymer under Seawater Wet-Dry Cycles

WANG Xiaobin1(), LUO Liting1, HE Zixiang1, CHEN Juan1,2()   

  1. 1.School of Urban Construction,Yangtze University,Jingzhou 434023,China
    2.Key Laboratory of Geomechanics and Geotechnical Engineering Safety,Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan 430071,China
  • Received:2025-12-08 Revised:2026-01-13 Published:2026-06-15 Online:2026-07-14

摘要:

为探究偏高岭土地聚合物砂浆在海洋环境中的服役性能,本文重点研究了硅灰石和矿渣复掺改性偏高岭土地聚合物砂浆在海水干湿循环与全浸泡两种侵蚀方式下的性能劣化规律与机理。以硅灰石与矿渣的质量比(1∶2、1∶1和2∶1)为变量,制备了硅灰石-矿渣-偏高岭土地聚合物砂浆及纯偏高岭土砂浆(MK),对比研究了在0~90个侵蚀周期内的表观形貌与物理性能、力学性能变化,并结合SEM、XRD等微观测试手段分析劣化机制。结果表明,干湿循环的破坏远大于全浸泡,这是因为干湿循环是一种由盐结晶压力和离子“泵吸”效应驱动的“物理-化学”耦合侵蚀。硅灰石和矿渣复掺能显著提升偏高岭土地聚合物砂浆的抗侵蚀耐久性,其中硅灰石和矿渣的质量比为1∶1(WSM15)时性能最佳。与基准MK相比,WSM15的抗压强度提升了59.3%,质量损失率降低了30.97%。复掺的增效作用源于硅灰石和矿渣的物理、化学协同效应。

关键词: 偏高岭土地聚合物, 硅灰石, 矿渣, 海水干湿循环, 侵蚀机理

Abstract:

To investigate the service performance of metakaolin geopolymer mortar in marine environments, this study focused on the degradation behavior and mechanisms of metakaolin geopolymer mortar modified with a wollastonite-slag composite admixture under two erosion modes: seawater wet-dry cycles and full immersion. Wollastonite-slag-metakaolin geopolymer mortars (WSM) with varying mass ratios of wollastonite to slag (1∶2, 1∶1, and 2∶1), along with pure metakaolin mortar (MK), were prepared. The evolution of their apparent morphology, physical properties, and mechanical performance over 0~90 erosion cycles was comparatively investigated, and the degradation mechanisms were analyzed using micro-testing methods such as SEM and XRD. The results indicate that the damage caused by wet-dry cycles is significantly more severe than that by full immersion. The former is identified as a “physical-chemical” coupled erosion process driven by salt crystallization pressure and an ion “pump” effect. The wollastonite-slag composite admixture significantly enhances erosion resistance and durability of metakaolin geopolymer mortar. Specifically, when the mass ratio of wollastonite to slag is 1∶1 (WSM15), geopolymer mortar exhibits the optimal performance. Compared with the reference MK group, the compressive strength of WSM15 increases by 59.3%, while the mass loss rate is reduced by 30.97%. The enhanced performance originates from the physical and chemical synergistic effects of wollastonite and slag.

Key words: metakaolin geopolymer, wollastonite, slag, seawater wet-dry cycle, erosion mechanism

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