INFLUENCE OF THE ADDITION OF MAN-MADE CERAMIC FIBER ON THE PHYSICAL PROPERTIES OF REFRACTORY CONCRETES

Reference Presenter Authors
(Institution)
Abstract
14-083 Rodrigo de Lima Ribeiro Ribeiro, R.d.(Escola Politécnica da Universidade de São Paulo); Lenz e Silva, G.F.(Escola Politécnica da Universidade de São Paulo); Refractory concretes are ceramic materials capable of withstanding high temperatures applications without losing their physicochemical and thermomechanical properties when exposed to environments above 811 K. They are widely used in the steel, cement, glass, chemical and petrochemical industries and usually they are made with high-alumina or calcium-aluminate cement and refractory aggregates (coarse grains) such as mullite, silicon carbide, electrofused oxides (brown and/or white alumina, spinel, magnesia, etc.) and different components from natural fibers to metallic powders. In this work the characterization and a comparative study of the effect of addition of man-made ceramic fibers into two alumina refractory concretes (low cement silicon-carbide castable and another no- cement content formulation based on andalusite material) using impulse excitation technique to evaluate the thermo-shock behavior and statistical correlation between physical-chemical properties and microstructural modification was performed. Main characterization tests of refractories samples like apparent density and apparent porosity, specific mass, cold crushing strength, elastic moduli and permanent linear change were done.
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