Early hydration and microstructure formation of ultra-rapid hardening alkali-activated slag cement (URHA) at presence of MgO

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

Cement & concrete composites Pub Date : 2025-03-18 DOI:10.1016/j.cemconcomp.2025.106057

Ziye Huang , Zuhua Zhang , Cheng Shi , Yingcan Zhu , Zhengning Zhou , Xiaolong Jia , Qiang Ren , Zhengwu Jiang

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Abstract

The fundamentals of hydration process of an ultra-rapid hardening alkali-activated slag cement (URHA) was studied for understanding the link between mechanical properties and microstructure development. By employing combined application of Raman spectroscopy, thermogravimetry (TG), X-ray diffractometry (XRD) and hydrogen low field ¹H nuclear magnetic resonance (LF ¹H NMR), it revealed that the mixing MgO into the URHA led to the formation of magnesium silicate hydrates (M-S-H), followed by the rapid development of calcium-alumino-silicate hydrates (C-A-S-H) and hydrotalcite (Ht). This not only altered the composition of the hydration products but also increased the reaction extent of early slag reactions, resulting in the formation of a more compact microstructure. The presence of MgO was proven to reduce chemical shrinkage (by 57.6 % when 12 % MgO was used), and increased compressive strength at 1 h. The formation and spacial distribution of Mg-containing phases were found to have positive effect on sustaining strength development in the later stages of 1 day and 3 days. This study provides an insight of the hydration mechanism of MgO-modified URHA, which can help predict hydration kinetics and performance for real applications.

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MgO存在下超快硬化碱活化矿渣水泥（URHA）的早期水化和微观结构形成

研究了超快硬化碱活化矿渣水泥（URHA）水化过程的基本原理，以了解其力学性能与微观结构发展之间的联系。通过拉曼光谱、热重（TG）、x射线衍射（XRD）和氢低场1H核磁共振（LF 1H NMR）的综合应用，发现MgO掺入URHA后，形成了硅酸镁水合物（M-S-H），随后形成了硅酸钙铝水合物（C-A-S-H）和水滑石（Ht）。这不仅改变了水化产物的组成，而且增加了早期渣反应的反应程度，导致微观结构更加致密。MgO的存在被证明可以减少化学收缩（当使用12% MgO时减少57.6%），并提高1小时的抗压强度。含镁相的形成和空间分布对1天和3天的持续强度发展有积极的影响。该研究揭示了mgo改性URHA的水化机理，有助于预测实际应用中的水化动力学和性能。

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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.