Abstract
The analized material was high alumina low cement castable sintered at three different temperatures. Influence of initial material anisotropy on the thermal shock resistance as well as changes of anisotropy level during the thermal shock were studied. Water quench test was used as an experimental method for the thermal stability testing. Surface anisotropy was analysed by image analysis and structural anisotropy using ultrasonic measurements. The results pointed out that the highest homogeinity and the lowest surface and structural anisotropy was for the samples sintered at 1600?C. Surface anistoropy had prevailing infuence on behavior of material during the thermal shock, but the structural anisotropy should not be neglected.
Highlights
Refractory castables, known as refractory concretes, are the most important group of monolithic refractories
An attempt was made to examine whether the surface or internal anisotropy has more influence on behavior of material subjected to the thermal shock and how they have changed during the testing
The samples treated at higher temperature show higher surface anisotropy and lower structural anisotropy
Summary
Refractory castables, known as refractory concretes, are the most important group of monolithic refractories. Today’s dense low and ultra-low cement refractory castables are very complex composition of aggregate, cement, water, fine and ultrafine fillers, additives, and deflocculants designed in accordance with packing model that provides optimal packing of particles [1,2]. Refractory concrete should be considered as two-phase composite, consisted of a matrix surrounding a skeleton of coarse aggregate grains. Coarser particles (≥ 45 μm) that make an aggregate are considered as an inert component, since they do not participate in formation of hydratable phases. Properties of the concretes are strongly dependant on phase composition, microstructure, and reactions between constituents inside the matrix [10,11]. Many properties of materials depend strongly on the structure, even if the composition of material remains the same. The properties of refractory concrete depend on characteristics of raw materials and processing procedure or synthesis. The treatment after synthesis that include curing, drying, and
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