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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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Acknowledgements

The study of this paper is financially supported by the Natural Science Foundation of the Jiangsu Higher Education Institutions of China (20KJB430030), Zhejiang Provincial Natural Science Foundation of China (LQ21E080008), Yangzhou “Lv-yang-jin-feng” project of China, Jiangsu innovation training program for college students of China (202111462014Y) and by Scientific Research Start-up Foundation of Ningbo University of Technology in 2020.

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Authors and Affiliations

  1. School of Civil and Engineering, Yangzhou Polytechnic College, Yangzhou, 225009, China

    Yujuan Tang, Feng Chen & Jiahui Zhang

  2. School of Civil and Transportation Engineering, Ningbo University of Technology, Ningbo, 315211, China

    Guangji Yin

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Correspondence to Guangji Yin.

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Tang, Y., Yin, G., Chen, F. et al. Solid–liquid equilibrium state and equation of cement-based materials in ammonium chloride solution. Mater Struct 55, 220 (2022). https://doi.org/10.1617/s11527-022-02062-z

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