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The Influence of the Coarse Fraction on the Porosity of Refractory Castables
J. Fruhstorfer, C.G. Aneziris
Institute of Ceramic, Glass and Construction Materials, Technische Universität Bergakademie Freiberg, Agricolastraße 17, 09596 Freiberg, Germany
received November 18, 2013, received in revised form January 8, 2014, accepted March 4, 2014
Vol. 5, No. 2, Pages 155-166 DOI: 10.4416/JCST2013-00043
Abstract
In this work, the influence of the coarse fraction of a particle size distribution on the flowability and density of refractory castables is investigated. A modified Andreasen model was developed to combine distribution moduli ≤ 0.30 in the fine fraction for flowability and stability with moduli adjusted between 0.28 and 1.20 in the coarse fraction for improving density. The amount of the fine fraction was held constant. It was shown that a density-optimized batch showed self-flowing behaviour, while the other batches needed to be vibrated. The bulk density of the unfired and fired ceramics was measured. The castable showing the best flowability with a distribution modulus of 0.80 in the coarse fraction also had the highest density and the smallest pore sizes with regard to the full range of pores. The pore sizes were measured by means of mercury porosimetry, optical microscopy and a visual method owing to the large range of pore sizes.
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Keywords
Refractory castables, coarse fraction, flowability, density, pore size distribution
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