Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Solid–liquid equilibrium state and equation of cement-based materials in ammonium chloride solution
https://orcid.org/0000-0003-2205-8636
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 ($ NH_{4} $Cl) 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 $ NH_{4} $Cl 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 $ NH_{4} $Cl 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 $ NH_{4} $Cl solutions were established.
Solid–liquid equilibrium state and equation of cement-based materials in ammonium chloride solution
https://orcid.org/0000-0003-2205-8636
Abstract Solid–liquid equilibrium curve of calcium (Ca) is important for analyzing the process of calcium leaching and its kinetics model. In this paper, the Ca solid–liquid equilibrium was experimentally investigated by hardened cement paste powder exposed to an accelerated leaching environment of 1 mol/L (1 M), 3 M and 6 M ammonium chloride ($ NH_{4} $Cl) 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 $ NH_{4} $Cl 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 $ NH_{4} $Cl 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 $ NH_{4} $Cl solutions were established.
Solid–liquid equilibrium state and equation of cement-based materials in ammonium chloride solution
https://orcid.org/0000-0003-2205-8636
Abstract Solid–liquid equilibrium curve of calcium (Ca) is important for analyzing the process of calcium leaching and its kinetics model. In this paper, the Ca solid–liquid equilibrium was experimentally investigated by hardened cement paste powder exposed to an accelerated leaching environment of 1 mol/L (1 M), 3 M and 6 M ammonium chloride ($ NH_{4} $Cl) 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 $ NH_{4} $Cl 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 $ NH_{4} $Cl 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 $ NH_{4} $Cl solutions were established.
Solid–liquid equilibrium state and equation of cement-based materials in ammonium chloride solution
Tang, Yujuan (Autor:in) / Yin, Guangji (Autor:in) / Chen, Feng (Autor:in) / Zhang, Jiahui (Autor:in)
2022
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Solid–liquid equilibrium state and equation of cement-based materials in ammonium chloride solution
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