Title:
On the Formation of Al/Fe-AFm Solid Solutions During Hydration of Fe-Rich Binders
Author(s):
Aurore Lechevallier, Mohend Chaouche, Jérôme Soudier and Guillaume Renaudin
Publication:
Symposium Paper
Volume:
362
Issue:
Appears on pages(s):
547-557
Keywords:
AFm layered hydrate; Fe-rich binder; Low-CO2 binder; Rietveld refinement; solid solutions; Vegard law.
DOI:
10.14359/51741010
Date:
6/14/2024
Abstract:
New hydraulic binders have been extensively studied as potential substitutes for Ordinary Portland Cement worldwide. Very often these binders contain a significant amount of iron and aluminum oxides, as a Ca4Al2-xFe2+xO10 like phase and generate AFm phases as a hydration product. To properly characterize the hydration process (anhydrous phases consumption versus hydrates precipitation), investigating the existence of (Fe/Al)-AFm solid solutions becomes important.
Consequently, layered AFm samples intercalated with various anions (nitrate, chloride, and carbonate) and with varying Fe/Al molar ratios were synthesized. Rietveld refinements were conducted to control the existence of the solid solutions between the two trivalent metallic end-members.
This study presents definitive evidence establishing continuous solid solutions within the three investigated systems of layered AFm phases containing nitrates, chlorides, or carbonates. These solid solutions conform to the Vegard’s law, and reflect the distances between trivalent cations, notably expanding with the iron substitution rate (in accordance with ionic radius RAl3+ = 0.53 Å and RFe3+ = 0.64 Å). A similar evolution was observed for the three series of AFm compounds.
Related References:
1. Proaño, L., Sarmiento, A. T., Figueredo, M. & Cobo, M. Techno-economic evaluation of indirect carbonation for CO2 emissions capture in cement industry: A system dynamics approach. J. Clean. Prod. 263, (2020).
2. Chikh, N., Cheikh-Zouaoui, M., Aggoun, S. & Duval, R. Effects of calcium nitrate and triisopropanolamine on the setting and strength evolution of Portland cement pastes. Mater. Struct. 41, 31–36 (2008).
3. Rapin, J.-P., Renaudin, G., Elkaim, E. & Francois, M. Structural transition of Friedel’s salt 3CaO·Al2O3·CaCl2·10H2O studied by synchrotron powder diffraction. Cem. Concr. Res. 32, 513–519 (2002).
4. François, M., Renaudin, G. & Evrard, O. A Cementitious Compound with Composition 3CaO.Al2O3.CaCO3.11H2O. Acta Crystallogr. C 54, 1214–1217 (1998).
5. Renaudin, G., Francois, M. & Evrard, O. Order and disorder in the lamellar hydrated tetracalcium monocarboaluminate compound. Cem. Concr. Res. 29, 63–69 (1999).
6. Renaudin, G. & François, M. The lamellar double-hydroxide (LDH) compound with composition 3CaO.Al2O3.Ca(NO3)2.10H2O. Acta Crystallogr. Sect. C 55, 835–838 (1999).
7. Renaudin, G., Kubel, F., Rivera, J.-P. & Francois, M. Structural phase transition and high temperature phase structure of Friedels salt, 3CaO · Al2O3 · CaCl2 · 10H2O. Cem. Concr. Res. 29, 1937–1942 (1999).
8. Renaudin, G., Rapin, J.-P., Humbert, B. & François, M. Thermal behaviour of the nitrated AFm phase Ca4Al2(OH)12(NO3)2 • 4H2O and structure determination of the intermediate hydrate Ca4Al2(OH)12(NO3)2 • 2H2O. Cem. Concr. Res. 30, 307–314 (2000).
9. Renaudin, G., Mesbah, A., Zeleke Dilnesa, B., Francois, M. & Lothenbach, B. Crystal Chemistry of Iron Containing Cementitious AFm Layered Hydrates. Curr. Inorg. Chem. 5, 184–193 (2015).
10. Dilnesa, B. Z. et al. Iron in carbonate containing AFm phases. Cem. Concr. Res. 41, 311–323 (2011).
11. Dilnesa, B. Z., Lothenbach, B., Renaudin, G., Wichser, A. & Wieland, E. Stability of Monosulfate in the Presence of Iron. J. Am. Ceram. Soc. 95, 3305–3316 (2012).
12. Rousselot, I. et al. Insights on the Structural Chemistry of Hydrocalumite and Hydrotalcite-like Materials: Investigation of the Series Ca2M3+(OH)6Cl·2H2O (M3+: Al3+, Ga3+, Fe3+, and Sc3+) by X-Ray Powder Diffraction. J. Solid State Chem. 167, 137–144 (2002).
13. Al-Jaberi, M., Naille, S., Dossot, M. & Ruby, C. Interlayer interaction in Ca–Fe layered double hydroxides intercalated with nitrate and chloride species. J. Mol. Struct. 1102, 253–260 (2015).
14. He, Z., Li, Y. & Shao, Y. Low-temperature synthesis of C4AF by self-propagating combustion reaction. Adv. Cem. Res. 29, 33–43 (2017).
15. Taylor, H. F. W. Cement chemistry. (1992).
16. Rodríguez-Carvajal, J. Program Fullprof 2k. (2005).
17. Mesbah, A. et al. Crystal Structures and Phase Transition of Cementitious Bi-Anionic AFm-(Cl−, CO32−) Compounds: Crystal Structures and Phase Transition. J. Am. Ceram. Soc. 94, 261–268 (2011).