Mechanisms for Migration of Alkali in Dolomitic Limestones.

IF 3.2 3区材料科学 Q3 CHEMISTRY, PHYSICAL

Materials Pub Date : 2025-09-21 DOI:10.3390/ma18184404

Xinyu Zhang, Wei Li, Xiaojun Huang, Zhixin Wang, Min Deng

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引用次数: 0

Abstract

The alkali-dolomite reaction (ADR) describes the interaction between alkalis in concrete and dolomite which results in dedolomitization, leading to cracking and deterioration of the concrete. A large number of research has explored the chemical products associated with the ADR, mechanisms of expansion, and methods of identification, but our understanding of the occurrence and progression of the ADR chemical reaction is substantially limited. Key factors controlling the ADR chemical reaction are generally not understood. This paper investigates the migration process of alkali ions in dolomitic limestone and reaction process with dolomite crystals and alkali. Dolomitic limestone samples were selected for experimentation. The amount of Sodium (Na⁺) was measured as a means of assessing alkali ion migration. We measured the degree of dedolomitization using X-ray diffraction (XRD). Microstructure was evaluated using field emission scanning electron microscopy (FESEM). This research provides new insights into dedolomitization. The pore network provides the physical pathway for alkali ion migration. Concentration gradients drive the migration of alkali ions, and their interactions control the efficiency of alkali ion migration.

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白云质灰岩中碱运移机理研究。

碱-白云石反应（ADR）是指混凝土中的碱与白云石相互作用，导致脱白云化，导致混凝土开裂和劣化的反应。大量的研究已经探索了与ADR相关的化学产物、扩展机制和识别方法，但我们对ADR化学反应的发生和发展的了解非常有限。控制不良反应化学反应的关键因素一般不清楚。本文研究了碱离子在白云岩灰岩中的迁移过程以及与白云岩晶体和碱的反应过程。选取白云岩灰岩样品进行实验。测定钠离子（Na+）的量，作为评估碱离子迁移的一种手段。用x射线衍射（XRD）测定了脱白云化程度。采用场发射扫描电镜（FESEM）观察其微观结构。这项研究为脱白云石化提供了新的见解。孔隙网络为碱离子迁移提供了物理途径。浓度梯度驱动碱离子迁移，其相互作用控制碱离子迁移效率。

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

Materials MATERIALS SCIENCE, MULTIDISCIPLINARY-

CiteScore

5.80

自引率

14.70%

发文量

7753

审稿时长

1.2 months

期刊介绍： Materials (ISSN 1996-1944) is an open access journal of related scientific research and technology development. It publishes reviews, regular research papers (articles) and short communications. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. Therefore, there is no restriction on the length of the papers. The full experimental details must be provided so that the results can be reproduced. Materials provides a forum for publishing papers which advance the in-depth understanding of the relationship between the structure, the properties or the functions of all kinds of materials. Chemical syntheses, chemical structures and mechanical, chemical, electronic, magnetic and optical properties and various applications will be considered.