Investigation of the carbonation mechanisms and kinetics in binary systems with C2S and Ca-Mg silicates
Villmow S, Mielkau A, Zajac M, Neubauer J (2025)
Publication Type: Journal article
Publication year: 2025
Journal
Book Volume: 505
Pages Range: 144756
Article Number: 144756
DOI: 10.1016/j.conbuildmat.2025.144756
Abstract
This study investigates the interaction of two binary systems, consisting of belite (C2S) with Ca-Mg silicates in terms of its reaction behavior. Experiments were conducted using mixtures containing 60 % belite (blend of β- and γ-C2S) combined with bredigite (C7MS4) and akermanite (C2MS2). The reactions were carried out in a custom-designed wet reactor, with continuous monitoring of pH and temperature to capture real-time data on system dynamics. Various analytical methods were applied to characterize the reactions. Time-resolved solution and solid analyses enabled a detailed investigation of the reaction kinetics and identification of key phases in the carbonation process. Significant differences in the reaction kinetics were identified between the two investigated systems. In the C2S-C7MS4 system, both reactants showed a similar carbonation behavior, whereas in the C2S-C2MS2 system, akermanite displayed a time-shifted onset of the carbonation reaction. The carbonation reaction can be divided into two main stages, each controlled by different parameters. The primary products include CaCO3 (vaterite, aragonite, calcite), amorphous CaCO3 (ACc), and amorphous silica gel.
Authors with CRIS profile
Sophia Villmow
Lehrstuhl für Mineralogie
Anika Mielkau
Lehrstuhl für Mineralogie
Jürgen Neubauer
Lehrstuhl für Mineralogie
Involved external institutions
Israel (IL)How to cite
APA:
Villmow, S., Mielkau, A., Zajac, M., & Neubauer, J. (2025). Investigation of the carbonation mechanisms and kinetics in binary systems with C2S and Ca-Mg silicates. Construction and Building Materials, 505, 144756. https://doi.org/10.1016/j.conbuildmat.2025.144756
MLA:
Villmow, Sophia, et al. "Investigation of the carbonation mechanisms and kinetics in binary systems with C2S and Ca-Mg silicates." Construction and Building Materials 505 (2025): 144756.
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