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Metakaolin sand – a promising addition for Portland cement

By I. Janotka, F. Puertas, M. Palacios, C. Varga and L. Krajči


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.<br><br>Las reservas de arena caolínica de la cantera eslovaca de Vyšný Petrovec ascienden a un total de 20 millones de toneladas. El material metacaolínico, que resulta al calentar la arena caolínica a 650 ºC, contiene entre un 31,5 y un 40% de metacaolinita, además de ilita, moscovita, cuarzo y feldespato. El objetivo de este estudio ha sido comprobar que esa arena calcinada es un material puzolánico; así como caracterizar los cementos y morteros preparados con dicha arena (MK-1). La hidratación de las mezclas se evaluó mediante calorimetría de conducción, y difracción de rayos X (DRX) y Análisis térmico-diferencial y termogravimétrico (ATD-TG). Se ha evaluado el desarrollo resistente de las mezclas y morteros; así como su estructura porosa. Los resultados obtenidos han demostrado que esa arena metacolínica (MK-1) es un material puzolánico y que podría utilizarse como adición al cemento y en la preparación de morteros

Topics: cement, mortar, metakaolin sand, pozzolanic activity, hydration, cemento, mortero, arena metacaolínica, actividad puzolánica, hidratación, Materials of engineering and construction. Mechanics of materials, TA401-492, Electrical engineering. Electronics. Nuclear engineering, TK1-9971, Technology, T, DOAJ:Materials, DOAJ:Technology and Engineering
Publisher: Consejo Superior de Investigaciones Científicas
Year: 2010
OAI identifier: oai:doaj.org/article:16bae468c55049dc9ac5fa150970f802
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