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

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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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Acknowledgements

The authors acknowledge greatly the financial support of this work by the fund of Science and Technology Plan of Zhejiang Province, China (Project No. 2007C23055), Chinese National Programs for High Technology Research and Development (Project No. 2006AA03Z385) and New Century Excellent Scholar Program of Ministry of Education of China (NCET-04-0549).

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Authors and Affiliations

  1. Department of Environmental Engineering, Zhejiang University, 310027, Hangzhou, China

    Baohong Guan, Wenbin Lou, Qingqing Ye, Hailu Fu & Zhongbiao Wu

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  1. Baohong Guan
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  2. Wenbin Lou
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  3. Qingqing Ye
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  5. Zhongbiao Wu
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Correspondence to Zhongbiao Wu.

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Guan, B., Lou, W., Ye, Q. et al. Calorimetric study of calcium aluminate cement blended with flue gas desulfurization gypsum. J Therm Anal Calorim 98, 737–742 (2009). https://doi.org/10.1007/s10973-009-0107-3

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  • DOI: https://doi.org/10.1007/s10973-009-0107-3

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