Effect of Na3PO4 on the Hydration Process of Alkali-Activated Blast Furnace Slag
by
Lukáš Kalina *, Vlastimil Bílek
, Radoslav Novotný, Miroslava Mončeková, Jiří Másilko and Jan Koplík
Lukáš Kalina *, Vlastimil Bílek, Radoslav Novotný, Miroslava Mončeková, Jiří Másilko and Jan Koplík
Materials Research Centre, Faculty of Chemistry, Brno University of Technology, Brno 612 00, Czech Republic
*
Author to whom correspondence should be addressed.
Academic Editor: Claudio Ferone
Materials 2016, 9(5), 395; https://doi.org/10.3390/ma9050395
Received: 13 April 2016 / Revised: 6 May 2016 / Accepted: 17 May 2016 / Published: 20 May 2016
(This article belongs to the Special Issue Advances in Geopolymers and Alkali-Activated Materials)
In recent years, the utilization of different non-traditional cements and composites has been increasing. Alkali-activated cementitious materials, especially those based on the alkali activation of blast furnace slag, have considerable potential for utilization in the building industry. However, alkali-slag cements exhibit very rapid setting times, which are too short in some circumstances, and these materials cannot be used for some applications. Therefore, it is necessary to find a suitable retarding admixture. It was shown that the sodium phosphate additive has a strong effect on the heat evolution during alkali activation and effectively retards the hydration reaction of alkali-activated blast furnace slag. The aim of the work is the suggestion of a reaction mechanism of retardation mainly based on Raman and X‑ray photoelectron spectroscopy.
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MDPI and ACS Style
Kalina, L.; Bílek, V.; Novotný, R.; Mončeková, M.; Másilko, J.; Koplík, J. Effect of Na3PO4 on the Hydration Process of Alkali-Activated Blast Furnace Slag. Materials 2016, 9, 395.
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