Effect of Mg on xonotlite structure and stability

IF 13.1 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Cement and Concrete Research Pub Date : 2025-07-03 DOI:10.1016/j.cemconres.2025.107970

S. Mingione , D. Jansen , F. Winnefeld , S.V. Churakov , B. Lothenbach

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引用次数: 0

Abstract

Minor constituents such as clays or dolomite might be present in the raw materials used for the synthesis of xonotlite (Ca₆Si₆O₁₇(OH)₂). These impurities can introduce additional elements (e.g., Mg, Al, Fe) into the system, affecting the purity of xonotlite, or promoting the formation of secondary phases. This study focuses on the influence of MgO on the formation and stability of xonotlite. A combination of solubility experiments conducted at 7, 20, 50 and 80 °C, along with thermodynamic modelling and atomistic simulations, was employed to investigate Mg incorporation. Structural and phase characterization was performed using XRD, TGA, FT-IR, SEM and ²⁹Si MAS-NMR. Up to 13 mol% of Mg can be incorporated into the xonotlite structure and the derived thermodynamic properties indicate that this leads to a stabilization of xonotlite. Higher quantities of magnesium lead to a stabilization of other phases such brucite, which may compete with xonotlite crystallization.

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镁对硬硅石结构及稳定性的影响

用于合成软钙石（Ca6Si6O17(OH)2）的原料中可能存在粘土或白云石等次要成分。这些杂质可以引入额外的元素（例如，Mg, Al, Fe）到系统中，影响硅钙石的纯度，或促进二次相的形成。本文主要研究了MgO对硅钙石形成及稳定性的影响。结合在7、20、50和80°C下进行的溶解度实验，以及热力学建模和原子模拟，研究了Mg的掺入。采用XRD、TGA、FT-IR、SEM和29Si MAS-NMR进行了结构和物相表征。高达13mol %的Mg可以被掺入硬石结构中，由此得出的热力学性质表明，这导致硬石稳定。较高的镁含量导致其他相的稳定，如水镁石，这可能与硅辉石的结晶相竞争。

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 and Concrete Research 工程技术-材料科学：综合

CiteScore

20.90

自引率

12.30%

发文量

318

审稿时长

53 days

期刊介绍： Cement and Concrete Research is dedicated to publishing top-notch research on the materials science and engineering of cement, cement composites, mortars, concrete, and related materials incorporating cement or other mineral binders. The journal prioritizes reporting significant findings in research on the properties and performance of cementitious materials. It also covers novel experimental techniques, the latest analytical and modeling methods, examination and diagnosis of actual cement and concrete structures, and the exploration of potential improvements in materials.