The monocarbonate Ca2Al1-xFex(OH)6·½CO3·nH2O AFm system

IF 10.9 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Cement and Concrete Research 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

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引用次数: 0

Abstract

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

\bar{3} c

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 Ca₂Al_1-xFe_x(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.

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来源期刊

Cement and Concrete Research 工程技术-材料科学：综合

CiteScore

20.90

自引率

12.30%

发文量

318

审稿时长

53 days

期刊介绍： Cement and Concrete Research is dedicated to publishing top-notch research on the materials science and engineering of cement, cement composites, mortars, concrete, and related materials incorporating cement or other mineral binders. The journal prioritizes reporting significant findings in research on the properties and performance of cementitious materials. It also covers novel experimental techniques, the latest analytical and modeling methods, examination and diagnosis of actual cement and concrete structures, and the exploration of potential improvements in materials.