Thermodynamic effects of chloride's type and dosage on phase composition of magnesium oxysulfate cement and its impact on macro-properties

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

Cement & concrete composites Pub Date : 2025-03-07 DOI:10.1016/j.cemconcomp.2025.106032

Tong Li , Yuhao Zheng , Huisu Chen , Tingting Zhang , Rongling Zhang

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引用次数: 0

Abstract

As magnesium oxysulfate cement (MOS) finds more applications in salt lakes and marine environments, the interaction between Cl⁻ and MOS has gained more attention. Nevertheless, a scarcity of previous studies has investigated the effects of chloride type and dosage on the phase composition of hardened MOS paste. This study creates a newly extended and internally consistent thermodynamic database to systematically explore the impacts of four chloride salts (NaCl, KCl, MgCl₂, and CaCl₂) on the phase assemblage of MOS at various chloride dosages, including chloride impurities (0–0.125 g/(100g MOS)), chloride attack (0–0.25 mol/(100g MOS)), and high-volume MgCl₂ (>0.05 mol/(100g MOS)). The predicted phase assemblages via thermodynamic modeling are validated using the experimental phase assemblages characterized by XRD from both the literature and our experiments. The gel-space ratio is used to bridge the relationship between phase composition and the compressive strength of samples. The feasibility of this correlation is confirmed by compressive strength from both the literature and our experiments.

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氯化物种类和用量对硫酸镁水泥相组成的热力学影响及其对宏观性能的影响

随着硫酸镁水泥（MOS）在盐湖和海洋环境中的应用越来越广泛，氯离子与MOS之间的相互作用受到越来越多的关注。然而，对于氯化物类型和用量对硬化MOS浆料相组成的影响的研究较少。本研究创建了一个新的扩展和内部一致的热力学数据库，以系统地探索四种氯化物盐（NaCl, KCl， MgCl2和CaCl2）在不同氯化物剂量下对MOS相组合的影响，包括氯化物杂质（0-0.125 g/(100g MOS)），氯化物攻击（0-0.25 mol/(100g MOS)）和大体积MgCl2 （>0.05 mol/(100g MOS)）。热力学模型预测的相组合通过文献和实验中XRD表征的实验相组合得到验证。凝胶-空间比用于连接相组成与样品抗压强度之间的关系。从文献和我们的实验中证实了这种相关性的可行性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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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.