SEM/EDX Characterization of the Hydration Products of Belite Cements from Class C Coal Fly Ash

This paper presents the microscopic characterization of two types of fly ash belite cements and their hydration products by means of scanning electron microscopy, energy‐dispersive X‐ray microanalysis, and X‐ray diffraction analysis. The cements were obtained from ASTM class C coal fly ash by the hy...

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Bibliographic Details
Published in:Journal of the American Ceramic Society 2007-12, Vol.90 (12), p.3915-3922
Main Authors: Goñi, Sara, Guerrero, Ana
Format: Article
Language:English
Subjects:
01 COAL, LIGNITE, AND PEAT
ALUMINIUM
Aluminum
Applied sciences
Buildings. Public works
Cement concrete constituents
Cement hydration
CEMENTS
Ceramics
COAL
Diffraction
Exact sciences and technology
FLY ASH
HYDRATION
Materials
MICROANALYSIS
Properties of anhydrous and hydrated cement, test methods
SCANNING ELECTRON MICROSCOPY
WASTE PRODUCT UTILIZATION
X-RAY DIFFRACTION
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Summary:This paper presents the microscopic characterization of two types of fly ash belite cements and their hydration products by means of scanning electron microscopy, energy‐dispersive X‐ray microanalysis, and X‐ray diffraction analysis. The cements were obtained from ASTM class C coal fly ash by the hydrothermal–calcination route in water (FABC‐2‐W) and NaOH 1M solution (FABC‐2‐N). The hydration was studied during a period of 180 days at 21°C and >95% RH. The results showed significant incorporation of aluminum (Al) into the C–S–H gel and other minor elements, with a presumable composition close to that of aluminum‐tobermorite. The C–S–H composition of the FABC‐2‐W is more stable over the hydration time than that of the FABC‐2‐N cement. Portlandite is scarcely formed during hydration.
ISSN:0002-7820
1551-2916
DOI:10.1111/j.1551-2916.2007.01996.x