Effect of metakaolin on the chloride diffusion properties of alkali-activated slag in an acidic environment

IF 5.3 2区地球科学 Q2 CHEMISTRY, PHYSICAL Applied Clay Science Pub Date : 2024-08-26 DOI:10.1016/j.clay.2024.107544

Lihan Kuang , Guanghua Li , Wenjing Ma , Leping Liu , Xuemin Cui

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Abstract

Alkali-activated materials (AAMs) have good resistance to chemical corrosion compared to silicate cements, but the effect of the pH of chloride-containing solutions on the resistance of AAMs to chloride diffusion is not clear. In this paper, the resistance of alkali-activated slag (AAS) with different metakaolin replacement rate to chloride diffusion in HCl/NaCl solution was investigated in terms of mechanical properties, hydration product composition and pore structure. The experimental results show that acidic solutions lead to alkali leaching, and dissolution of gel and hydrotalcite. The capillary pores that appeared in the AAS after the replacement rate of 10% metakaolin resulted in a decrease in the average pore size of the AAS and low depth of chloride diffusion. 30% metakaolin replacement led to a decrease in the diffusion resistance. In HCl solution, the high [AlO₄]⁵⁻ retention corroded layer was observed in the AAS with 30% metakaolin replacement and this layer slowed down the migration rate of [Cl⁻]. This study shows the promising application of alkali-activated slag/metakaolin in complex chloride solution environments.

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偏高岭土对酸性环境中碱活化炉渣氯化物扩散特性的影响

与硅酸盐水泥相比，碱活性材料（AAMs）具有良好的抗化学腐蚀性，但含氯溶液的 pH 值对 AAMs 抗氯化物扩散性的影响尚不清楚。本文从力学性能、水化产物组成和孔隙结构等方面研究了不同偏高岭土取代率的碱活性矿渣（AAS）在盐酸/氯化钠溶液中抗氯化物扩散的性能。实验结果表明，酸性溶液会导致碱浸出、凝胶和水滑石溶解。10% 的偏高岭土置换率后，AAS 中出现了毛细孔，导致 AAS 的平均孔径减小，氯化物扩散深度降低。30% 的偏高岭土置换率导致扩散阻力下降。在盐酸溶液中，添加了 30% 偏高岭土的 AAS 中出现了高[AlO4]5-保留腐蚀层，该腐蚀层减缓了[Cl-]的迁移速度。这项研究表明，碱活性矿渣/偏高岭土在复杂的氯化物溶液环境中的应用前景广阔。

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来源期刊

Applied Clay Science 地学-矿物学

CiteScore

10.30

自引率

10.70%

发文量

289

审稿时长

39 days

期刊介绍： Applied Clay Science aims to be an international journal attracting high quality scientific papers on clays and clay minerals, including research papers, reviews, and technical notes. The journal covers typical subjects of Fundamental and Applied Clay Science such as: • Synthesis and purification • Structural, crystallographic and mineralogical properties of clays and clay minerals • Thermal properties of clays and clay minerals • Physico-chemical properties including i) surface and interface properties; ii) thermodynamic properties; iii) mechanical properties • Interaction with water, with polar and apolar molecules • Colloidal properties and rheology • Adsorption, Intercalation, Ionic exchange • Genesis and deposits of clay minerals • Geology and geochemistry of clays • Modification of clays and clay minerals properties by thermal and physical treatments • Modification by chemical treatments with organic and inorganic molecules(organoclays, pillared clays) • Modification by biological microorganisms. etc...