Materiales de Construcción, Vol 60, No 298 (2010)

Metakaolin sand – a promising addition for Portland cement


https://doi.org/10.3989/mc.2010.51509

I. Janotka
Building Testing and Research Institute, Bratislava, Slovakia

F. Puertas
Instituto de Ciencias de la Construcción Eduardo Torroja, CSIC, Madrid, Spain

M. Palacios
Instituto de Ciencias de la Construcción Eduardo Torroja, CSIC, Madrid, Spain

C. Varga
Instituto de Ciencias de la Construcción Eduardo Torroja, CSIC, Madrid, Spain

L. Krajči
Slovak Academy of Sciences, Bratislava, Slovakia

Abstract


The kaolin sand resource at the Vyšný Petrovec quarry in Slovakia comes to a total of 20 megatonnes. The metakaolin material obtained by heating kaolin sand at 650 ºC contains from 31.5 to 40% (wt) metakaolinite, as well as illite, muscovite, quartz and feldspar. The aim of this study was to verify whether this calcined sand (MK1) is a pozzolanic material and characterize the cements and mortars prepared with it. The hydration reactions taking place in the blends were assessed with conduction calorimetry, X-ray diffraction (XRD) and differential thermal analysis-thermogravimetry (DTA-TG). Blend and mortar strength development and pore structure were also evaluated. The results obtained showed that this metakaolin sand (MK-1) is a pozzolanic material apt for use as a cement addition and for making mortars.

Keywords


cement; mortar; metakaolin sand; pozzolanic activity; hydration

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