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Article

Use of Isothermal and Isoperibolic Calorimetry to Study the Effect of Zinc on Hydration of Cement Blended with Fly Ash

1
Materials Research Centre, Faculty of Chemistry, Brno University of Technology, CZ-61200 Brno, Czech Republic
2
Institute of Environmental Technology, Technical University of Ostrava, CZ-70800 Ostrava, Czech Republic
3
Faculty of Civil Engineering, Institute of Concrete and Masonry Structures, Brno University of Technology, CZ-60200 Brno, Czech Republic
4
Institute of Construction and Architecture, Slovak Academy of Sciences, SK-845 03 Bratislava, Slovak
*
Author to whom correspondence should be addressed.
Materials 2020, 13(22), 5215; https://doi.org/10.3390/ma13225215
Received: 10 October 2020 / Revised: 31 October 2020 / Accepted: 16 November 2020 / Published: 18 November 2020
(This article belongs to the Section Construction and Building Materials)
Increasing utilization of secondary raw materials and alternative fuels results in increasing contents of metals in cements. Zinc is one of these elements. It comes to cement with secondary raw materials such as slag or fly ash or by the utilization of used tires as an alternative fuel. Zinc ions significantly prolong the hydration process in cement. This work deals with the influence of zinc ions in the form of very poorly soluble ZnO salt and easily soluble ZnCl2 and Zn(NO3)2 on the hydration of cement blended with fly ash. Zinc was dosed in the range of 0.05%, 0.1%, 0.5% and 1% of cement weight. The effect of zinc on hydration was monitored by isothermal and isoperibolic calorimetry. A 15% addition of fly ash to cement mainly causes further retardation of hydration reactions due to the reactions of fly ash particles with Ca2+ ions from cement. The strongest effect on the hydration retardation from all investigated compounds showed in ZnO as it dissolves very slowly. On the contrary, for the dosage of 1% of zinc in the form of ZnCl2 significant acceleration of hydration occurred. In this work, a synergistic effect on the prolongation of hydration with a combination of cement, zinc and fly ash was demonstrated. The lengths of induction periods were assessed from detected calorimetric curves and from these lengths the curves were gained by fitting with the exponential function. Final products were next analyzed using X-ray diffraction. View Full-Text
Keywords: portland cement; zinc; isothermal calorimetry; isoperibolic calorimetry; fly ash portland cement; zinc; isothermal calorimetry; isoperibolic calorimetry; fly ash
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MDPI and ACS Style

Šiler, P.; Kolářová, I.; Novotný, R.; Másilko, J.; Bednárek, J.; Janča, M.; Koplík, J.; Hajzler, J.; Matějka, L.; Marko, M.; Švec, J.; Zlámal, M.; Kuzielová, E.; Opravil, T.; Šoukal, F. Use of Isothermal and Isoperibolic Calorimetry to Study the Effect of Zinc on Hydration of Cement Blended with Fly Ash. Materials 2020, 13, 5215. https://doi.org/10.3390/ma13225215

AMA Style

Šiler P, Kolářová I, Novotný R, Másilko J, Bednárek J, Janča M, Koplík J, Hajzler J, Matějka L, Marko M, Švec J, Zlámal M, Kuzielová E, Opravil T, Šoukal F. Use of Isothermal and Isoperibolic Calorimetry to Study the Effect of Zinc on Hydration of Cement Blended with Fly Ash. Materials. 2020; 13(22):5215. https://doi.org/10.3390/ma13225215

Chicago/Turabian Style

Šiler, Pavel, Iva Kolářová, Radoslav Novotný, Jiří Másilko, Jan Bednárek, Martin Janča, Jan Koplík, Jan Hajzler, Lukáš Matějka, Michal Marko, Jiří Švec, Martin Zlámal, Eva Kuzielová, Tomáš Opravil, and František Šoukal. 2020. "Use of Isothermal and Isoperibolic Calorimetry to Study the Effect of Zinc on Hydration of Cement Blended with Fly Ash" Materials 13, no. 22: 5215. https://doi.org/10.3390/ma13225215

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