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Title: Microstructure of amorphous aluminum hydroxide in belite-calcium sulfoaluminate cement

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}.
Authors:
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Publication Date:
OSTI Identifier:
22475500
Resource Type:
Journal Article
Resource Relation:
Journal Name: Cement and Concrete Research; Journal Volume: 71; Other Information: Copyright (c) 2015 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
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