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This work presents a preliminary study on the corrosion behavior of construction steel in cement-based materials, containing waste products, namely “red mud”, as partial replacement of the cement portion in the mixtures. The paper reports on the initial electrochemical tests in model solutions of cement extract (CEm), cement extract + 20% red mud (CEmRM) and chloride contaminated (adding 5% NaCl) solutions (CEmN and CEmRMN), thus aiming to study the behavior of the steel electrodes in such media, prior to the tests in mortar and concrete. “Red mud” is the waste, generated during aluminum production from bauxite. It is reported that the annual production of 1 tone of metallic aluminum generates about 2 tones of red mud. Consequently, research on ways of making use of this residue is of significant importance. Moreover, in addition to the economic and ecological advantages, the use of “red mud” will not create new residues. Materials: Steel electrodes (construction steel FeB500HWL) of 4cm exposed surface were immersed in the above described solutions and monitored at different intervals. The solutions were prepared as follows: cement extract (CEm) by mixing water and Portland cement (OPC CEM 32.5), ratio 1:1, stirring for 24h and filtration; cement extract+red mud (CEmRM): CEm + 20% replacement of the cement portion with dry powder (105oC) of red mud; chloride containing solutions: by adding 5% NaCl to the already filtrated CEm and CEmRM. The red mud compositions, determined by XRF and the cement composition are given in Table 1.

Electrochemical Impedance and Potentio-Dynamic Polarization of Construction Steel in Cement Extract, Containing Red Mud and Chloride Contamination