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Faculty of Metallurgy and Technology Travnička cesta 1, Zenica, University of Zenica , Zenica , Bosnia and Herzegovina
Faculty of Metallurgy and Technology Travnička cesta 1, Zenica, University of Zenica , Zenica , Bosnia and Herzegovina
Faculty of Metallurgy and Technology Travnička cesta 1, Zenica, University of Zenica , Zenica , Bosnia and Herzegovina
The paper examined the conventional castables composed of a mixture of high aluminate cement with 70% Al2O3, chamotte waste with 42% Al2O3 and brick clay ,,Rapajlo“. The influence of particle size distribution on density, porosity, water absorption, modulus of rapture and cold crashing strength was investigated. Particle size distribution was determined by the Dinger and Funk equation, using four different coefficient q. With the reduction of coefficient q, the amount of fine fractions is increased and the amount of larger fractions is decreased. Two series of samples were investigated. In the first series as the smallest fraction of all mixtures with different factor q was used high aluminate cement and water-cement ratio 0.485. Increasing the amount of cement has led to increasing the density and strength of castable. The increased amount of water has led to an increase in porosity. In the second series, the amount of cement and water remained the same, a part of the superfine fraction is replaced by clay. Replacing chamotte waste with clay leads to a slight increase in the density and strength of the material. When a part of the cement is also replaced with clay it slight reduce the density and strength of the material, because part of the water is placed between sheets of clay minerals and leads to an increase in volume, and at the same time reducing the amount of water needed for the reaction with cement.
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