Journal of Thermal Analysis and Calorimetry
Volume/Issue:
Volume 86: Issue 3
Hydration of α-hemihydrate in the presence of carboxylic acids
Authors:
C. Vellmer University Kassel Department of Structural Materials Kassel Germany 34125 Moenchebergstr. 7 Kassel Germany 34125 Moenchebergstr. 7

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B. Middendorf University of Dortmund Department of Building Materials Dortmund Germany 44227 August-Schmitt 8 Dortmund Germany 44227 August-Schmitt 8

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N. Singh DDU Gorakhpur University Department of Chemistry Gorakhpur India 273009 Gorakhpur India 273009

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Pages:
721–726
Online Publication Date:
11 Aug 2006
Publication Date:
01 Dec 2006
Article Category:
Research Article
DOI:
https://doi.org/10.1007/s10973-005-7224-4
Keywords:
calcium sulphate; chemisorption; crystallization; microstructure; nucleation
Restricted access

Abstract  

α-Hemihydrate was allowed to hydrate in the presence of tartaric, succinic, malic or citric acids at room temperature at a water/ binder ratio of 0.35. Hydration of hemihydrate leading to the crystallisation of calcium sulphate dihydrate is an exothermic process. The temperature rise during hydration was measured as a function of time using a semi-adiabatic method. The temperature rise–time curves are similar for all investigated systems but with different induction period. The results showed that calcium sulphate dihydrate crystallisation is a nucleation controlled process and different acids are chemisorbed at the surface of forming nuclei to different extent. Processes taking place during nucleation may control the morphology of resultant crystals. Infrared spectral and differential scanning calorimetric studies confirmed the adsorption of carboxylic acids at the surface of dihydrate crystals.

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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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