SEM/EDX characterization of the hydration products of belite cements from class C coal fly ash

Journal Article · Sat Dec 15 04:00:00 EST 2007 · Journal of the American Ceramic Society

OSTI ID:21004671

Goni, S; Guerrero, A ^[1]

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1. CSIC, Madrid (Spain)

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{sup o}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.

• OSTI ID: 21004671
• Journal Information: Journal of the American Ceramic Society, Journal Name: Journal of the American Ceramic Society Journal Issue: 12 Vol. 90; ISSN 0002-7820; ISSN JACTAW
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
ALUMINIUM
CEMENTS
COAL
FLY ASH
HYDRATION
MICROANALYSIS
SCANNING ELECTRON MICROSCOPY
WASTE PRODUCT UTILIZATION
X-RAY DIFFRACTION