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The monocarbonate Ca2Al1-xFex(OH)6·½CO3·nH2O AFm system
Cement and Concrete Research ( IF 10.9 ) Pub Date : 2025-01-24 , DOI: 10.1016/j.cemconres.2025.107804
Aurore Lechevallier, Yunge Bai, Antoine Rochelet, Rodolphe Thirouard, Mohend Chaouche, Evelyne Prat, Jérôme Soudier, Guillaume Renaudin
Cement and Concrete Research ( IF 10.9 ) Pub Date : 2025-01-24 , DOI: 10.1016/j.cemconres.2025.107804
Aurore Lechevallier, Yunge Bai, Antoine Rochelet, Rodolphe Thirouard, Mohend Chaouche, Evelyne Prat, Jérôme Soudier, Guillaume Renaudin
With the growing emphasis on reducing CO2 emissions, new hydraulic binders are gaining attention. Understanding the hydration products of these new binders is crucial. This study investigates mixed Al/Fe-CO3 AFm hydrates. This research proposes two methods to synthesize CO3-AFm phases with varying proportions of trivalent Al3+ and Fe3+ cations, followed by a thorough characterization of the samples. Results showed that Al-rich samples crystallized only in the triclinic P1 space group, whereas the Fe-containing CO3-AFm phase crystallized in both the triclinic P1 and trigonal R space groups. A complete solid solution between the two end-members (Ca2Al(OH)6⋅(CO3)0.5⋅2.5H2O and Ca2Fe(OH)6⋅(CO3)0.5⋅2.5H2O) was confirmed with triclinic symmetry, whereas a partial solid solution was observed for the rhombohedral Ca2Al1-xFex(OH)6⋅(CO3)0.5⋅3H2O higher hydrate with ∼0.33 ≤ x ≤ 1. This study enhances the characterization of Al/Fe-mixed CO3-AFm phases that develop during the hydration of binders containing iron and aluminum, offering crucial insights for developing new sustainable construction materials.
更新日期:2025-01-25