Isothermal calorimetry and X-ray diffraction analyses were used to investigate the hydration of tricalcium aluminate (3CaO·Al2O3) in 0·5, 1·0 and 3·0 M magnesium sulphate solutions. Hydration was carried out isothermally at temperatures ranging from 30 to 80°C. Monosulphate (Ca4Al2(OH)12·(SO4)·6H2O), ettringite ([Ca3Al(OH)6·12H2O]2·(SO4)3·2H2O), gypsum (CaSO4·2H2O) and a hydrogarnet phase (Ca3[Al(OH)6]; C3AH6) were all observed as hydration products. Monosulphate and C3AH6 were the only phases observed for hydration in 0·5 and 1·0 M magnesium sulphate solutions. Ettringite was the dominant crystalline phase after hydration in 3·0 M solution, regardless of temperature. Gypsum was the only other crystalline phase observed after hydration in 3·0 M solutions. Hydration rates are faster than those observed in previous studies using similar sources of tricalcium aluminate and calcium sulphate. This indicates the hydration rate of tricalcium aluminate is enhanced by the presence of magnesium in solution. No crystalline magnesium containing phases were detected, regardless of temperature or magnesium sulphate concentration.
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October 2000
Research Article|
October 01 2000
The formation of ettringite from tricalcium aluminate and magnesium sulphate Available to Purchase
B. A. Clark;
B. A. Clark
*
Department of Materials Science and Engineering, The Pennsylvania State University
University Park, PA 16802, USA
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P. W. Brown
P. W. Brown
*
Department of Materials Science and Engineering, The Pennsylvania State University
University Park, PA 16802, USA
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Publisher: Emerald Publishing
Received:
March 04 1999
Revision Received:
September 30 1999
Accepted:
February 29 2000
Online ISSN: 1751-7605
Print ISSN: 0951-7197
© 2000 Thomas Telford Ltd
2000
Advances in Cement Research (2000) 12 (4): 137–142.
Article history
Received:
March 04 1999
Revision Received:
September 30 1999
Accepted:
February 29 2000
Citation
Clark BA, Brown PW (2000), "The formation of ettringite from tricalcium aluminate and magnesium sulphate". Advances in Cement Research, Vol. 12 No. 4 pp. 137–142, doi: https://doi.org/10.1680/adcr.2000.12.4.137
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