Solid–liquid equilibrium state and equation of cement-based materials in ammonium chloride solution

Yujuan Tang; Guangji Yin; Feng ChenJiahui Zhang

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Solid–liquid equilibrium state and equation of cement-based materials in ammonium chloride solution

机译：Solid–liquid equilibrium state and equation of cement-based materials in ammonium chloride solution

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Abstract Solid–liquid equilibrium curve of calcium (Ca) is important for analyzing the process of calcium leaching and its kinetics model. In this paper, the Ca solid–liquid equilibrium was experimentally investigated by hardened cement paste powder exposed to an accelerated leaching environment of 1?mol/L (1?M), 3?M and 6?M ammonium chloride (NH4Cl) solutions. The equilibrium curves of Ca, magnesium (Mg), sulfur (S), aluminum (Al) and iron (Fe) were obtained by EDTA titration and scanning electron microscope-electronic diffraction spectroscopy. Results show that, the obtained equilibrium curve in NH4Cl solution has a similar three-stage form to that in deionized water. It indicates that, the Ca leaching mechanism of cement based materials in ammonium solution is similar to that in water. In addition, the Ca leaching in NH4Cl solution is accompanied by the leaching of S and Mg, and they are also leached in three stages, but Al and Fe are not leachable. Based on the experimental data, the equations of Ca solid–liquid equilibrium curve under 1?M, 3?M and 6?M NH4Cl solutions were established.

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来源
《Materials and structures》 |2022年第8期|1-15|共15页
作者
Yujuan Tang; Guangji Yin; Feng ChenJiahui Zhang;
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作者单位

Yangzhou Polytechnic College;

Ningbo University of Technology;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);
原文格式 PDF
正文语种英语
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关键词
Calcium leaching; Solid–liquid equilibrium; Hardened cement paste; Ammonium chloride solution;

Solid–liquid equilibrium state and equation of cement-based materials in ammonium chloride solution

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