The hydration characteristics of a tricalcium aluminate and gypsum mixture with a mole ratio of 1 : 1 in the presence and absence of calcium lignosulfonate at 30 and 50°C were investigated. Different ratios of calcium lignosulfonate were used namely 0, 1 and 3% by weight. The water-to-solid ratio used was 10. Hydration was carried out for various time intervals from 0·5 h up to 90 days. Ettringite and monosulfate hydrate were the only hydration products formed as indicated by X-ray diffraction analysis and scanning electron microscopy. The results of combined water content, X-ray diffraction and scanning electron microscopy indicate that calcium lignosulfonate retarded the formation of ettringite at early hydration ages. The extent of hydration was inversely proportional to the ratio of calcium lignosulfonate.
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July 2010
Research Article|
July 01 2010
Hydration reactions of the C3A-CaSO4.2H2O system (1 : 1 mole ratio) at 30 and 50°C. Part I – effect of calcium lignosulfonate
E.A. Kishar;
E.A. Kishar
Department of Chemistry, University College for Girls, Ain Shams University, Cairo, Egypt
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W.S. Hegazy;
W.S. Hegazy
Department of Chemistry, University College for Girls, Ain Shams University, Cairo, Egypt
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D.A. Ahmed
D.A. Ahmed
Department of Chemistry, University College for Girls, Ain Shams University, Cairo, Egypt
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Department. of Chemistry, University College for Girls, Ain Shams University, Cairo, Egypt.
Publisher: Emerald Publishing
Revision Received:
June 24 2009
Received:
November 23 2009
Accepted:
November 23 2009
Online ISSN: 1751-7605
Print ISSN: 0951-7197
© 2010 Thomas Telford Ltd
2010
Advances in Cement Research (2010) 22 (3): 123–126.
Article history
Revision Received:
June 24 2009
Received:
November 23 2009
Accepted:
November 23 2009
Citation
Kishar E, Hegazy W, Ahmed D (2010), "Hydration reactions of the C3A-CaSO4.2H2O system (1 : 1 mole ratio) at 30 and 50°C. Part I – effect of calcium lignosulfonate". Advances in Cement Research, Vol. 22 No. 3 pp. 123–126, doi: https://doi.org/10.1680/adcr.2010.22.3.123
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