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Materials (Basel). 2016 May 20;9(5). pii: E395. doi: 10.3390/ma9050395.

Effect of Na₃PO₄ on the Hydration Process of Alkali-Activated Blast Furnace Slag.

Author information

1
Materials Research Centre, Faculty of Chemistry, Brno University of Technology, Brno 612 00, Czech Republic. kalina@fch.vutbr.cz.
2
Materials Research Centre, Faculty of Chemistry, Brno University of Technology, Brno 612 00, Czech Republic. bilek@fch.vut.cz.
3
Materials Research Centre, Faculty of Chemistry, Brno University of Technology, Brno 612 00, Czech Republic. xcnovotny2@fch.vut.cz.
4
Materials Research Centre, Faculty of Chemistry, Brno University of Technology, Brno 612 00, Czech Republic. xcmoncekova@fch.vut.cz.
5
Materials Research Centre, Faculty of Chemistry, Brno University of Technology, Brno 612 00, Czech Republic. masilko@fch.vut.cz.
6
Materials Research Centre, Faculty of Chemistry, Brno University of Technology, Brno 612 00, Czech Republic. koplik@fch.vut.cz.

Abstract

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.

KEYWORDS:

alkali activated cement; granulated blast furnace slag; retardation

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