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Calorimetric study of ternary binder of calcium aluminate cement, Portland-limestone cement and FGD gypsum

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Abstract

To use flue gas desulfurization (FGD) gypsum and limestone as supplement of cement, conduction calorimetry was applied to investigate the early hydration of ternary binder of calcium aluminate cement (CAC), Portland-limestone cement (PLC), and FGD gypsum, supplemented with the determination of setting times and X-ray diffraction (XRD) analysis. Different exothermal profiles were presented in two groups of pastes, in which one group (group A) sets the mass ratio of FGD gypsum/CAC at 0.25 and the other group (group B) sets the mass ratio of PLC/CAC at 0.25. Besides the two common exothermal peaks in cement hydration, a third exothermal peak appears in the pastes with 5–15% FGD gypsum after gypsum is depleted. It is found that not PLC but FGD gypsum plays the key role in such ternary binder where the reaction of ettringite formation dominates the hydration process. PLC accelerates the hydration of ternary binder, which mainly attributes to the nucleating effect of fine limestone particles and PC clinker. The modified hydration process and mechanism in this case is well visualized by the means of calorimetry and it helps us to optimize such design of ternary cementitious material.

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Acknowledgements

The authors acknowledge greatly the financial support of this work by the fund of Chinese National Program for High Technology Research and Development (Project No. 2006AA03Z385), Science and Technology Plan of Zhejiang Province, China (Project No. 2007C23055) and the New Century 151 Talent Project of Zhejiang Province.

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

    Wenbin Lou, Baohong Guan & Zhongbiao Wu

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

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Lou, W., Guan, B. & Wu, Z. Calorimetric study of ternary binder of calcium aluminate cement, Portland-limestone cement and FGD gypsum. J Therm Anal Calorim 101, 119–127 (2010). https://doi.org/10.1007/s10973-009-0542-1

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  • DOI: https://doi.org/10.1007/s10973-009-0542-1

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