Investigation on early hydration of ternary Portland cement-blast-furnace slag-metakaolin blends

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Authors	BOHÁČ Martin PALOU M. NOVOTNY R. MASILKO J. VŠIANSKÝ Dalibor STANEK T.
Year of publication	2014
Type	Article in Periodical
Magazine / Source	Construction and Building Materials
MU Faculty or unit	Faculty of Science
Citation
Doi	http://dx.doi.org/10.1016/j.conbuildmat.2014.04.018
Field	Geology and mineralogy
Keywords	Ternary system; Portland cement; Metakaolin; Blast-furnace slag; Hydration
Description	The paper investigates the hydration of ternary blends comprising Portland cement, blast-furnace slag and metakaolin. The isothermal calorimetry and "in situ" X-ray diffraction was used to evaluate the effect of metakaolin and blast-furnace slag on the early hydration of blends. XRD, DTA and SEM were used to analyze the hardened paste after 1 month of hydration. Metakaolin influences significantly the kinetics, mechanism and products of hydration at initial period of hydration causing the rapid formation of ettringite. Hemicarbonate aluminate hydrate is formed as a product of ettringite conversion due to the presence of reactive calcite in Portland cement. (C) 2014 Elsevier Ltd. All rights reserved.