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

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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Abstract

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.