Abstract
The paper reports the observation that siderite (FeCO3 mineral) cementation occurs when compacted Fe-powder (10 µm in this study) is subjected to aqueous carbonation. It is further shown that the siderite contents of the reaction products vary based on the temperature and the CO2-pressure conditions under which they are carbonated. Using SEM-SE observations, two different types of morphologies of siderite crystals are observed based on the temperature are which the aqueous carbonation of iron is performed. The XRD-Rietveld observations and the SEM-SE observations are combined to infer that dendritic Fe-oxide crystals are formed away from the Fe surfaces, and that the siderite crystals grow as scales at the carbonating Fe surfaces. The concurrence of the variation in the siderite content and compressive strength is observed based on XRD-Rietveld analysis. The results of XRD-Rietveld analysis and MIP are combined to show that pore filling and refinement may not be a suitable indicator of compressive strength in such systems.
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