Effect of exposure conditions on alkali-silica reactions in glass incorporated mortars: Importance of sodium ion

IF 2.7 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY Materials Letters Pub Date : 2024-11-07 DOI:10.1016/j.matlet.2024.137690

Lianfang Sun , Xingji Zhu , Yujin Wang , Guochen Zhao

引用次数: 0

Abstract

In this study, the alkali-silica reaction (ASR) in glass-incorporated mortar (GIM) under various types of Na⁺-contained exposure conditions were investigated by analyzing ASR expansion, compressive strength, and microstructure. As a key result, in comparison to the exposure condition with the same hydroxide OH⁻ concentration, a dramatic increase in ASR-induced expansion can be observed under the mixture condition of 0.5 N-NaOH + 0.5 N-NaCl. SEM/EDX results reveales that Na⁺ can improve Na/Si ratio of ASR gel, resulting in a higher swelling capacity. The variation of compressive strength under different exposure conditions was also studied, and then interpreted by analysis of pore structure characteristics. This work highlights the role of Na⁺ ion on ASR under alkaline conditions, leading to more precautions in the manufacture of GIM.

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暴露条件对掺玻璃的砂浆中碱-二氧化硅反应的影响：钠离子的重要性

本研究通过分析 ASR 膨胀、抗压强度和微观结构，研究了各种含 Na+ 的暴露条件下玻璃嵌合砂浆（GIM）中的碱硅反应（ASR）。主要结果是，与相同氢氧化物 OH- 浓度的暴露条件相比，在 0.5 N-NaOH + 0.5 N-NaCl 混合条件下，可以观察到 ASR 引起的膨胀急剧增加。SEM/EDX 结果表明，Na+ 可以提高 ASR 凝胶的 Na/Si 比率，从而提高膨胀能力。此外，还研究了不同暴露条件下抗压强度的变化，并通过对孔隙结构特征的分析进行了解释。这项研究强调了 Na+ 离子在碱性条件下对 ASR 的作用，从而为 GIM 的生产提供了更多的预防措施。

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 Letters 工程技术-材料科学：综合

CiteScore

5.60

自引率

3.30%

发文量

1948

审稿时长

50 days

期刊介绍： Materials Letters has an open access mirror journal Materials Letters: X, sharing the same aims and scope, editorial team, submission system and rigorous peer review. Materials Letters is dedicated to publishing novel, cutting edge reports of broad interest to the materials community. The journal provides a forum for materials scientists and engineers, physicists, and chemists to rapidly communicate on the most important topics in the field of materials. Contributions include, but are not limited to, a variety of topics such as: • Materials - Metals and alloys, amorphous solids, ceramics, composites, polymers, semiconductors • Applications - Structural, opto-electronic, magnetic, medical, MEMS, sensors, smart • Characterization - Analytical, microscopy, scanning probes, nanoscopic, optical, electrical, magnetic, acoustic, spectroscopic, diffraction • Novel Materials - Micro and nanostructures (nanowires, nanotubes, nanoparticles), nanocomposites, thin films, superlattices, quantum dots. • Processing - Crystal growth, thin film processing, sol-gel processing, mechanical processing, assembly, nanocrystalline processing. • Properties - Mechanical, magnetic, optical, electrical, ferroelectric, thermal, interfacial, transport, thermodynamic • Synthesis - Quenching, solid state, solidification, solution synthesis, vapor deposition, high pressure, explosive