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Study on the hydration process and borax retarding mechanism of the magnesium ammonium phosphate cement-based coating system

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Abstract

In this study, the reaction process of the MAPC coating system is investigated. And the delayed curing mechanism of borax in the coating hydration system is proposed. The results suggest that the research process of magnesium oxide-monoammonium phosphate-water diluted ternary suspension system is applicable for the MAPC coating reaction process, which can be divided into three stages: NH4H2PO4 dissolution, MgNH4PO4·6H2O primary crystallization and secondary crystallization. Borax can delay the setting and hardending time of MAPC, reduce the pH value and lower the hydration temperature without forming any new hydration product. Borax can improve the fluidity of MAPC coatings, and borax content has an effect on the compressive strength of MAPC hardened paste. The retarding effect is controlled by the formation and rupture of the protective film on the surface of MgO; the other is controlled by lowering the system temperature and adjusting the pH value of the coatings. In the hydration process, borax does not form new hydration products.

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Acknowledgements

The authors would like to express their appreciations to Science and Technology Program of Henan Province of China (172102210393; 182102210418), and Key scientific research projects of universities in Henan (19B560004; 20B560010), and Kaifeng Science and Technology Program of Kaifeng City of China (2107001; 1901023; 2004043), and Funding for the high-level scientific research team of Kaifeng university, and Funded by the science and technology platform of Kaifeng University collaborative innovation center for new energy-saving building materials, and Research Fund project of Kaifeng University(KDBS-2020-1). The authors would like to express their appreciations to Kaifeng innovative science and technology team project and Kaifeng science and technology innovation talent plan funded project.

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Authors and Affiliations

  1. School of Civil Engineering and Architecture, Kaifeng University, Kaifeng, 475004, Henan, China

    Jun Li

  2. Key Laboratory of construction solid waste recycling technology of Kaifeng, Kaifeng University, Kaifeng, 475004, Henan, China

    Jun Li

  3. Solid Waste Recycling and Harmless Engineering Technology Research Center of Kaifeng, Kaifeng University, Kaifeng, 475004, Henan, China

    Jun Li

  4. Collaborative Innovation Center for New Energy-Saving Building Materials of Kaifeng University, Kaifeng, 475004, Henan, China

    Jun Li

  5. Sponge City Engineering Materials Technology Research center of Kaifeng, Kaifeng University, Kaifeng, 475004, Henan, China

    Jun Li

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Correspondence to Jun Li.

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Li, J. Study on the hydration process and borax retarding mechanism of the magnesium ammonium phosphate cement-based coating system. Sādhanā 47, 147 (2022). https://doi.org/10.1007/s12046-022-01920-4

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  • DOI: https://doi.org/10.1007/s12046-022-01920-4

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