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Critierional evaluation of thermal destruction of corundum concretes

Research paper by T. G. Gal'chenko, I. F. Usatikov, A. G. Karaulov, É. V. Degtyareva, G. A. Gogotsi, Ya. L. Grushevskii, V. I. Galenko

Indexed on: 01 May '88Published on: 01 May '88Published in: Refractories and Industrial Ceramics



Abstract

The resistance of corundum concretes to thermal destruction was studied using the experimentally plotted deformation diagrams and the standard thermal cycling method. The correlation between the values of thermal shock resistance obtained according to these methods was established for the corundum concretes.It was established that as compared to the concrete produced using a binder based on the Talyum cement, the concretes incorporating a hydraulically hardening (water-setting) binder prepared from the VTs-70 grade high-alumina cement exhibit better resistance to thermal stresses. With increasing strength and density of the concretes, their thermal destruction occurs catastrophically (abruptly) since the elements of a stronger structure (the concretes produced using the Talyum cement-based binder) are incapable of effectively hindering the growth of a potential crack.Modification of the structure of the concrete by introducing Cr2O3 additive leads not only to an increased thermal shock resistance in the high-temperature range due to an increased critical crack length, but also to an increased resistance ot crack displacement (opening).