Microstructure of amorphous aluminum hydroxide in belite-calcium sulfoaluminate cement

Journal Article · Fri May 15 00:00:00 EDT 2015 · Cement and Concrete Research

DOI:https://doi.org/10.1016/J.CEMCONRES.2015.01.013· OSTI ID:22475500

Song, Fei; Yu, Zhenglei; Yang, Fengling; Lu, Yinong; Liu, Yunfei

Belite-calcium sulfoaluminate (BCSA) cement is a promising low-CO{sub 2} alternative to ordinary Portland cement. Herein, aluminum hydroxide (AH{sub 3}), the main amorphous hydration product of BCSA cement, was investigated in detail. The microstructure of AH{sub 3} with various quantities of gypsum was investigated via scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS). The AH{sub 3} with various morphologies were observed and confirmed in the resulting pastes. Particular attention was paid to the fact that AH{sub 3} always contained a small amount of Ca according to the results of EDS analysis. The AH{sub 3} was then characterized via high resolution transmission electron microscopy (HRTEM). The results of HRTEM indicated that Ca arose from nanosized tricalcium aluminate hexahydrate which existed in the AH{sub 3}.

• OSTI ID: 22475500
• Journal Information: Cement and Concrete Research, Vol. 71; Other Information: Copyright (c) 2015 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0008-8846
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINATES
ALUMINIUM HYDROXIDES
CALCIUM COMPOUNDS
CARBON DIOXIDE
GYPSUM
HYDRATION
MICROSTRUCTURE
MORPHOLOGY
NANOSTRUCTURES
PORTLAND CEMENT
SCANNING ELECTRON MICROSCOPY
TRANSMISSION ELECTRON MICROSCOPY
X-RAY SPECTROSCOPY