Corundum and Bauxite-based Concretes – Non-destructive Testing of Mechanical Properties and its Correlation with the Sintering Process

Ljubica Pavlovic´, A. Terzic´

Institute for Technology of Nuclear and other Raw Mineral Materials, 11000 Belgrade, Serbia

Revision

Volume 2, Issue 2, Pages 80-85

Abstract

This manuscript presents a new approach on correlation between sintering process, porosity and an important thermo-mechanical property of refractory concrete – creep. A non-destructive test method was applied on the corundum- and bauxite-based refractory concretes, i.e. ultrasonic pulse velocity and also Image Pro Plus program for image analysis. Progression of sintering process can be monitored by the change of the porosity parameters determined with ultrasonic pulse velocity and image analysis. Investigated concretes are varying in chemical and mineral composition. Apparent porosity of samples thermally treated at 110, 800, 1000, 1300 and 1500 ºC was primary investigated with standard laboratory procedure. Sintering parameters were calculated from the creep testing. Loss of strength and material degradation occurred in concrete when it was subjected to increased temperature and compressive load. Mechanical properties indicate and monitor changes within microstructure. Level of surface deterioration after thermal treatment was determined using Image Pro Plus image analysis program. Mechanical strength was determined using ultrasonic pulse velocity testing. Investigations presented in this paper confirm that results of creep deformation testing, image analysis and ultrasonic pulse velocity testing are interconnected and that they are a means to monitor the sintering process within concrete exposed to high temperature. Mentioned interconnection can be useful when type of high temperature concrete is to be chosen for application in a metallurgical furnace or some other plant operating at high temperature.

Keywords

ultrasonic pulse velocity, sintering, porosity, refractory concrete, image analysis, creeprn

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