Cement-based materials sometimes encounter sulfate attack and ammonium salt environments during service, which can severely affect the long-term durability of these materials. In cement-based materials, the formation of thaumasite usually requires five conditions: sulfate, silicate, carbonate, and sufficient water and low temperature (<15°C). However, under other conditions, thaumasite can also form. To study the changing trend of thaumasite in an ammonium salt solution at ambient temperature (25°C), the formation process of thaumasite was studied by laser Raman spectroscopy and thermodynamic analysis. The reaction was accelerated in the presence of \( {\mathrm{NH}}_4^{+} \) ions at ambient temperature, and the presence of \( {\mathrm{SO}}_4^{2-} \) anions enhanced this trend; this enhancement was even greater than that at low temperature. The change in the Gibbs free energy of formation of thaumasite in the presence versus the absence of \( {\mathrm{NH}}_4^{+} \) ions was studied using thermodynamic methods, and the acceleration mechanism of the formation of thaumasite in the presence of \( {\mathrm{NH}}_4^{+} \) ions was explained.
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Published in Zhurnal Prikladnoi Spektroskopii, Vol. 89, No. 4, pp. 491–497, July–August, 2022.
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Wang, X., Guo, S. & Li, Y. Formation of Thaumasite in Ammonium Salt Solution Based on Raman Spectroscopy and Thermodynamic Analysis. J Appl Spectrosc 89, 658–664 (2022). https://doi.org/10.1007/s10812-022-01407-4
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DOI: https://doi.org/10.1007/s10812-022-01407-4