Effect of Na3PO4 on the Hydration Process of Alkali-Activated Blast Furnace Slag
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Date
2016-05-20
Authors
Kalina, Lukáš
Bílek, Vlastimil
Novotný, Radoslav
Mončeková, Miroslava
Másilko, Jiří
Koplík, Jan
0000-0001-8127-8175Advisor
Referee
Mark
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MDPI
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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 Xray photoelectron spectroscopy.
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Peer-reviewed
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en