石灰石微粉对水泥基材料氯离子传输的影响机理研究

摘要/Abstract

摘要： 石灰石微粉等辅助性胶凝材料部分取代水泥可有效降低建筑材料领域的碳排放,但其对耐久性方面的影响仍需进一步探索。通过抗压强度、自然浸泡氯离子、电迁移加速氯离子传输等测试,探讨了石灰石微粉掺量、原材料细度以及水胶比等因素对水泥基材料氯离子传输的影响规律。根据物相组成和孔结构特征研究了石灰石微粉对体系微结构的影响,结合宏观性能与微观分析结果深入讨论了体系的抗氯离子传输能力与物相组成、孔隙曲折度、最可几孔径的关系。结果表明,在水泥-石灰石微粉体系中,当石灰石微粉掺量低于15%(质量分数)时,石灰石微粉对体系的抗氯离子传输性能影响较小,结构因子可有效衡量体系的抗氯离子传输能力。物相组成和孔隙曲折度与氯离子传输的相关性较低,最可几孔径是影响氯离子传输的最主要因素。

关键词: 石灰石微粉, 氯离子传输, 结构因子, 最可几孔径, 物相组成, 孔隙曲折度

Abstract: The partial replacement of cement with supplementary cementitious materials such as limestone powder can effectively reduce carbon emissions in the field of construction materials. However, its impact on durability still needs further exploration. The effects of limestone powder content, raw material fineness and water/binder ratio on chloride ion transport of cement-based materials were investigated by testing compressive strength, natural immersion of chloride ion and electromigration acceleration chloride ion transport. According to the phase composition and pore structure characteristics, the effect of limestone powder on the microstructure of system was studied. Combined with the macroscopic properties and microscopic analysis results, the relationship between chloride ion transport resistance and phase composition, pore tortuosity and critical pore size of system was discussed. The results show that in cement-limestone powder system, when the content of limestone powder is less than 15% (mass fraction), the influence of limestone powder on chloride ion transport resistance of system is small, and the formation factors can effectively measure the chloride ion transport resistance of system. In addition, the phase composition and pore tortuosity exhibit little correlation with chloride ion transport, and the critical pore size is the most important factor affecting chloride ion transport.

Key words: limestone powder, chloride ion transport, formation factor, critical pore size, phase assemblage, pore tortuosity

中图分类号:

TU528

单亚龙, 杨圣洁, 何公瑞, 眭世玉, 李绍纯, 耿永娟. 石灰石微粉对水泥基材料氯离子传输的影响机理研究[J]. 硅酸盐通报, 2023, 42(9): 3089-3099.

SHAN Yalong, YANG Shengjie, HE Gongrui, SUI Shiyu, LI Shaochun, GENG Yongjuan. Influence Mechanism of Limestone Powder on Chloride Ions Transport of Cement-Based Material[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(9): 3089-3099.

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