Wet carbonation of C3A and pre-hydrated C3A

Villmow S, Mielkau A, Götz-Neunhoeffer F, Neubauer J (2023)


Publication Type: Journal article

Publication year: 2023

Journal

Book Volume: 173

Article Number: 107259

DOI: 10.1016/j.cemconres.2023.107259

Abstract

The carbonation of C3A and pre-hydrated C3A was studied at different initial pH values, temperatures, pre-hydration and carbonation times. Based on these investigations, the reaction kinetics of C3A under humid conditions were considered in more detail. The reaction products were characterized by quantitative X-ray diffraction (QXRD) and thermogravimetric analysis (TGA). C3A shows no significant reaction when carbonated directly in suspension, however, it has been observed that pre-hydrated C3A can be carbonated. A higher reaction degree was obtained with increasing hydration time. Consistent with reaching a stable pH, no further reaction of the hydrate phases was detected after ~20 min, indicating fast kinetics of the carbonation reaction. At temperatures ≤21 °C, the CaCO3 polymorph vaterite was found to be the main phase. At a pre-hydration temperature of 40 °C, C3AH6 appeared as a stable hydrate phase, but showed no reaction with CO2 under our experimental conditions.

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How to cite

APA:

Villmow, S., Mielkau, A., Götz-Neunhoeffer, F., & Neubauer, J. (2023). Wet carbonation of C3A and pre-hydrated C3A. Cement and Concrete Research, 173. https://doi.org/10.1016/j.cemconres.2023.107259

MLA:

Villmow, Sophia, et al. "Wet carbonation of C3A and pre-hydrated C3A." Cement and Concrete Research 173 (2023).

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