Journal of Thermal Analysis and Calorimetry
Volume/Issue:
Volume 98: Issue 3

Calorimetric study of calcium aluminate cement blended with flue gas desulfurization gypsum

Authors:
Baohong Guan Zhejiang University Department of Environmental Engineering 310027 Hangzhou China

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,
Wenbin Lou Zhejiang University Department of Environmental Engineering 310027 Hangzhou China

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Qingqing Ye Zhejiang University Department of Environmental Engineering 310027 Hangzhou China

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Hailu Fu Zhejiang University Department of Environmental Engineering 310027 Hangzhou China

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Zhongbiao Wu Zhejiang University Department of Environmental Engineering 310027 Hangzhou China

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Pages:
737–742
Online Publication Date:
19 Jun 2009
Publication Date:
01 Dec 2009
Article Category:
Research Article
DOI:
https://doi.org/10.1007/s10973-009-0107-3
Keywords:
Calcium aluminate cement; Calorimetry; Ettringite; FGD gypsum; Hydration
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Abstract  

The use of by-product gypsum is an important alternative in concrete design. In present experiment, conduction calorimetry was applied to investigate the early hydration of calcium aluminate cement (CAC)/flue gas desulfurization (FGD) gypsum paste, supplemented with the determination of setting times and analysis of hydrates by X-ray diffraction (XRD). It was found that different profiles of heat evolution rate were presented depending on the CAC/FGD gypsum ratio. Two distinct exothermic peaks, associating with CAC hydration and ettringite formation respectively, appeared when the FGD gypsum content was less than 20%. Hydrate barrier mechanism was introduced to explain the difference in induction periods of the pastes with or without FGD gypsum. It is concluded that the blending of FGD gypsum accelerates the hydration of CAC for the quick formation of ettringite and generates greater hydration heat from per gram of pure CAC for the high exothermic effect of ettringite formation. The dissolution and diffusion of gypsum plays an important role of reacting controller during the hydrations of the pastes with FGD gypsum. The modified hydration process and mechanism in this case is well visualized by means of calorimetry.

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Cover Journal of Thermal Analysis and Calorimetry
Journal of Thermal Analysis and Calorimetry
Print ISSN:
1388-6150
Online ISSN:
1572-8943

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Journal of Thermal Analysis and Calorimetry
Language English
Size A4
Year of
Foundation		 1969
Volumes
per Year		 1
Issues
per Year		 24
Founder Akadémiai Kiadó
Founder's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher		 Chief Executive Officer, Akadémiai Kiadó
ISSN 1388-6150 (Print)
ISSN 1588-2926 (Online)

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