THE MECHANICAL PROPERTIES OF CONCRETE WITH RED MUD (BAUXITE RESIDUE) AND NANO-Al2O3 AT HIGH TEMPERATURES

This study was carried out in order to produce a concrete with better performance by examining the effect of red mud, which is a waste material, and Nanopowder (Nano-A1203) additives on the mechanical properties of concrete under the influence of high temperature. Samples were made by replacing 10% of the cement with red mud and adding Nano-A1203 into the concrete in the ratios 0.5%, 1%, and 1.25%, respectively. The test specimens were exposed to temperatures of 200, 400 and 600 C, for 3 hours. Residual stresses and tensile strength, as well as weight loss values, were determined after high-temperature exposures. As a result, it can be said that the combination of red mud and Nano-A1203 under high temperature had positive effects on the concrete, and the optimum ratio was 10% red mud and 0.5% Nano A1203. A significant reduction in the mechanical properties of concrete normally occurs with increasing temperature; however, the use of red mud waste material in addition to Nanopowder under the effect of high temperature produces a concrete with a better performance.