阐明浸没条件下不同浓度场氯离子迁移对超低水胶比水泥基复合材料水化及微观结构特征的影响

IF 10.8 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Cement & concrete composites Pub Date : 2025-03-03 DOI:10.1016/j.cemconcomp.2025.106014

J.Y. Zhu , S.Y. Fu , K. Wei , X. Liu , Y.K. Chen , R.K. Wang , R. Yu

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引用次数: 0

摘要

通过实验方法和热力学模拟相结合的方法，阐明了不同浓度场下氯离子迁移对超低水胶比胶凝复合材料（ULWBRCC）水化和微观结构特性的影响。具体而言，在淡水混合和水下修复（FWR）、淡水混合和海洋修复（FMR）和海水混合和海洋修复（SMR）三种修复场景下，分析了离子迁移对ULWBRCC孔隙浓度、水化相和微观结构的影响。实验和热力学模拟结果表明，离子迁移与基质中早期孔隙浓度有很强的相关性。在SMR中，孔隙中的氯离子稳定较早，外部氯离子迁移主要发生在水化后期。在FMR中，早期孔隙结构中不存在氯离子，浓度梯度主要是外部的。与FWR相比，由于离子迁移和化学反应的驱动，海水离子浓度的增加导致SMR的水化程度最低，C-S-H降低了27.22%，AFt增加了10.83%，氯离子将AFm相转化为弗里德尔盐。

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Clarify the impact of chloride ion migration in different concentration fields on the hydration and microstructure characteristics of ultra-low water/binder ratio cement-based composites under submerged conditions

The effect of chloride ion migration on the hydration and microstructural characteristics of ultra-low water/binder ratio cementitious composites (ULWBRCC) in different concentration fields is clarified through the combination of experimental methods and thermodynamic simulations. Specifically, the effects of ion migration on pore concentration, hydration phases, and microstructure in ULWBRCC are analyzed in three repair scenarios: freshwater-mixed and underwater repair (FWR), freshwater-mixed and marine repairs (FMR), and seawater-mixed and marine repairs (SMR). The experimental and thermodynamic simulation results indicate a strong correlation between ion migration and the early pore concentration in the matrix. In SMR, chloride ions in the pores stabilize early, and external chloride migration primarily occurs in the later stages of hydration. In FMR, no chloride ions are present in the early pore structure, and the concentration gradient is mainly external. Compared to FWR, the increased seawater ion concentration, driven by ionic migration and chemical reactions, leads to the lowest hydration degree in SMR, with a 27.22 % reduction in C-S-H and a 10.83 % increase in AFt. And chloride ions transform the AFm phase into Friedel salt.

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来源期刊

Cement & concrete composites 工程技术-材料科学：复合

CiteScore

18.70

自引率

11.40%

发文量

459

审稿时长

65 days

期刊介绍： Cement & concrete composites focuses on advancements in cement-concrete composite technology and the production, use, and performance of cement-based construction materials. It covers a wide range of materials, including fiber-reinforced composites, polymer composites, ferrocement, and those incorporating special aggregates or waste materials. Major themes include microstructure, material properties, testing, durability, mechanics, modeling, design, fabrication, and practical applications. The journal welcomes papers on structural behavior, field studies, repair and maintenance, serviceability, and sustainability. It aims to enhance understanding, provide a platform for unconventional materials, promote low-cost energy-saving materials, and bridge the gap between materials science, engineering, and construction. Special issues on emerging topics are also published to encourage collaboration between materials scientists, engineers, designers, and fabricators.