Villmow S, Mielkau A, Götz-Neunhoeffer F, Neubauer J (2023)
Publication Type: Journal article
Publication year: 2023
Book Volume: 173
Article Number: 107259
DOI: 10.1016/j.cemconres.2023.107259
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.
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).
BibTeX: Download