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The influence of pH buffers on hydration of hydraulic phases in system CaO–Al2O3

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Abstract

The present paper deals with the study of pH buffer influence (pH + ions) on hydration course of tricalcium aluminate (C3A), monocalcium aluminate (CA), monocalcium di-aluminate (CA2) and dodecacalcium hepta-aluminate (C12A7). These calcium aluminate phases were synthesized at 1450 °C (CA and C3A), 1600 °C (CA2) and 1360 °C (C12A7), respectively. The purity of synthesized products was controlled by X-ray diffraction (XRD). Then, different calcium aluminate phases were hydrated at 25 °C in excess of water at pH 6 and with buffers to keep the pH values at 9, 11 and 13. The evolution of hydration heat was monitored by isothermal calorimetry for 48 h. After this period, hydration was stopped and the products were cross-characterized with different techniques: XRD, high-temperature X-ray diffraction, combined differential thermal analysis–thermogravimetry–effluent gas analysis. It was found out that the hydration course and the nature of hydration products of different calcium aluminate phases are strongly dependent on the hydration environment (pH + ions).

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Acknowledgements

The work has been supported by grant project no. GA13-41018S financed by Czech Science Foundation and by project Materials Research Centre at FCH BUT—Sustainability and Development, REG LO1211, with financial support from National Programme for Sustainability I (Ministry of Education, Youth and Sports of Czech Republic).

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Authors and Affiliations

  1. Faculty of Chemistry, Materials Research Centre, Brno University of Technology, Purkyňova 118, 61200, Brno, Czech Republic

    František Šoukal, Jan Koplík, Petr Ptáček, Tomáš Opravil, Jaromír Havlica, Martin T. Palou & Lukáš Kalina

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  1. František Šoukal
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  2. Jan Koplík
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  3. Petr Ptáček
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  5. Jaromír Havlica
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  6. Martin T. Palou
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  7. Lukáš Kalina
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Correspondence to František Šoukal.

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Šoukal, F., Koplík, J., Ptáček, P. et al. The influence of pH buffers on hydration of hydraulic phases in system CaO–Al2O3 . J Therm Anal Calorim 124, 629–638 (2016). https://doi.org/10.1007/s10973-015-5190-z

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  • DOI: https://doi.org/10.1007/s10973-015-5190-z

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