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Calorimetric study of magnesium potassium phosphate cement

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Abstract

The thermal behavior of magnesium potassium phosphate cement (MKPC) during the early reaction period has been monitored by isothermal conduction calorimetry at 298 K. It is found that the typical heat evolution curve of the MKPC hydration has one endothermic valley and two distinct exothermic peaks. It is believed that the endothermic valley corresponds to the dissolution of potassium dihydrogen phosphate and the exothermic peaks are related to the dissolution of magnesia and the formation of magnesium potassium phosphate hexahydrate, respectively. The influences of the water to powder ratio, the magnesium to phosphate molar ratio and the setting retarder content on the reaction can be reflected in a change of shape and intensity of the peaks on the heat flow curve. The variation trend is consistent with the change of the setting time of MKPC pastes.

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Acknowledgments

The financial support from the Hong Kong Research Grant Council under grant 615810 and the China Ministry of Science and Technology under grant 2009CB623200 are gratefully acknowledged.

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Authors and Affiliations

  1. Department of Civil and Environmental Engineering, The Hong Kong University of Science and Technology, Hong Kong, China

    Fei Qiao, C. K. Chau & Zongjin Li

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  1. Fei Qiao
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  2. C. K. Chau
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  3. Zongjin Li
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Correspondence to Zongjin Li.

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Qiao, F., Chau, C.K. & Li, Z. Calorimetric study of magnesium potassium phosphate cement. Mater Struct 45, 447–456 (2012). https://doi.org/10.1617/s11527-011-9776-z

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  • DOI: https://doi.org/10.1617/s11527-011-9776-z

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