Chloride transport in alkali activated materials influenced by different reaction products: a review

IF 1.8 4区工程技术 Q3 CONSTRUCTION & BUILDING TECHNOLOGY Magazine of Concrete Research Pub Date : 2024-06-04 DOI:10.1680/jmacr.23.00285

Tao Liu, Jianfeng Fan, Ziqiang Peng

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Abstract

Alkali activated materials are regarded as a substitution building material of Portland Cement (PC) with high chloride resistance and low CO2 footprint. This review study provides a multi-scale perspective to understand material-product-microstructure-property relationships in terms of chloride binding behavior of AAMs. Physical and chemical chloride stability of different reaction products is summarized from nanostructure, microstructure to macro properties. The analysis of cited studies are determined to give an overview of recent progress in chloride transport in AAMs influenced by different reaction products. Results show that higher Ca/Si, Al/Si molar and alkali content increase amorphous phases formation, leading to a denser microstructure and lower chloride penetration in AAMs. Higher MgO and Al2O3 incorporation results in more formation of hydrotalcite. The enhanced physical and chemical absorption of chloride by hydrotalcite leads to higher resistance of chloride penetration in AAMs. The investigation of increasing chloride resistance can potentially focus on the increase of gels and hydrotalcite formation.

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不同反应产物对碱活化材料中氯化物迁移的影响：综述

碱活性材料被视为硅酸盐水泥（PC）的替代建筑材料，具有高抗氯性和低二氧化碳足迹。本综述研究提供了一个多尺度的视角，从 AAMs 的氯化物结合行为的角度来理解材料-产品-微结构-性能之间的关系。从纳米结构、微观结构到宏观性能，总结了不同反应产物的物理和化学氯化物稳定性。通过对引用研究的分析，概述了受不同反应产物影响的 AAMs 中氯离子迁移的最新进展。结果表明，较高的 Ca/Si、Al/Si 摩尔和碱含量会增加无定形相的形成，从而导致 AAMs 中的微观结构更致密，氯化物渗透率更低。氧化镁和氧化铝的含量越高，形成的水滑石就越多。水滑石对氯化物的物理和化学吸收能力增强，从而提高了 AAM 的抗氯化物渗透能力。提高抗氯化物渗透能力的研究可能集中在凝胶和水滑石形成的增加上。

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来源期刊

Magazine of Concrete Research 工程技术-材料科学：综合

CiteScore

4.60

自引率

11.10%

发文量

102

审稿时长

5 months

期刊介绍： For concrete and other cementitious derivatives to be developed further, we need to understand the use of alternative hydraulically active materials used in combination with plain Portland Cement, sustainability and durability issues. Both fundamental and best practice issues need to be addressed. Magazine of Concrete Research covers every aspect of concrete manufacture and behaviour from performance and evaluation of constituent materials to mix design, testing, durability, structural analysis and composite construction.