Chloride transport, binding, and microstructure in alkali-activated concrete with different types of precursor combinations

IF 10.9 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Cement and Concrete Research Pub Date : 2025-07-24 DOI:10.1016/j.cemconres.2025.108002

Zuobang Yao , Ram Pal , Haemin Song , Arthur Van de Keere , Ali Kashani , Elke Gruyaert , Taehwan Kim

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引用次数: 0

Abstract

This paper presented the experimental results of investigating chloride resistance and the microstructure of alkali-activated concrete (AAC). To show the reliable and efficient chloride transport analyses for AAC, a modified rapid chloride penetration test using 10 V was validated, and the conventional chloride profile methods were compared with the newly developed micro X-ray fluorescence (μXRF) profile method. Six AAC mixtures incorporating different precursors were evaluated for mechanical strength, water absorption, chloride diffusion, and binding. At the same content of ground granulated blast furnace slag in mixtures, the precursor incorporating calcined bauxite tailings and rice husk ash increased porosity and reduced chloride resistance compared to that containing fly ash. This study revealed that chloride binding in all AAC used in this study was predominantly physical and reversible, contrasting with Portland cement systems. μXRF technique provided reliable and spatially resolved chloride profile data for AAC. This study provides valuable insights into AAC performance and testing, emphasising the importance of precursor selection for sustainable AAC.

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不同类型前驱体组合碱活化混凝土中氯化物的运输、结合和微观结构

本文介绍了碱活化混凝土（AAC）抗氯离子性能及微观结构研究的实验结果。为了验证AAC中氯离子输运分析的可靠性和有效性，对改进的10 V快速氯离子渗透试验进行了验证，并将传统的氯离子谱法与新开发的微x射线荧光（μXRF）谱法进行了比较。六种含有不同前体的AAC混合物在机械强度、吸水率、氯离子扩散和结合方面进行了评估。在相同掺量下，铝土矿尾矿与稻壳灰混合的混合料比粉煤灰混合料孔隙率提高，抗氯离子性能降低。该研究表明，与波特兰水泥系统相比，本研究中使用的所有AAC中的氯化物结合主要是物理的和可逆的。μXRF技术提供了可靠的、空间分辨的氯化物剖面数据。本研究为AAC的性能和测试提供了有价值的见解，强调了前体选择对可持续AAC的重要性。

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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.