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Title
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Siderite-calcite (FeCO₃-CaCO₃) series cement formation by accelerated carbonation of CO₂(g)-H₂O-Fe-Ca(OH)₂ systems
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Author
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Abstract
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| Carbonation-cementation and bulk reaction mechanisms are studied in systems containing closely packed mixes of particulate Fe (0) (-10 mu m) and Ca(OH)(2) (0%, 5%, 10% and 15% w/w of Ca(OH)2) subjected to elevated CO2- pressure (1, 5, 10, and 20 barg) and temperature (30 degrees C and 60 degrees C). Solid solutions of (CaxFe1-x)CO3 series minerals are observed through shifting and broadening of XRD-reflections with variations in Ca(OH)(2) content, CO2-pressure and temperature. The product morphologies varied from rhombohedral in non-Ca(OH)(2) systems, to distorted rhombohedral (at 60 degrees C) and scalenohedral (at 30 degrees C) in the systems containing Ca(OH)(2). An X-ray diffraction-based interpolation method is developed to discern mixed and end-member carbonates for more accurate bulk phase quantification. Based on these observations, variations in cementation performances are explained. Exceptional formation of an Fe-LDH and a (Ca,Fe)-LDH has also been observed in some systems. Interestingly, these LDH phases were stable even after being exposed to ambient conditions for more than 75 days. |
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Language
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English
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Source (journal)
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Cement and concrete composites. - Barking
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Publication
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Barking
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2021
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ISSN
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0958-9465
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DOI
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10.1016/J.CEMCONCOMP.2021.104137
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Volume/pages
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122
(2021)
, 13 p.
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Article Reference
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104137
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ISI
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000679306600004
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Medium
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E-only publicatie
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Full text (Publisher's DOI)
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Full text (open access)
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Full text (publisher's version - intranet only)
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