Abstract
Red mud, the main waste generated in aluminum and alumina production from bauxite ore by the Bayer process, is considered "hazardous" due to its high pH. The high pH also provides greater protection of rebars, which is reflected in the low corrosion potential and high electrical resistivity (filler effect) of concrete. The corrosion potential was monitored by electrochemical measurements and the electrical resistivity was evaluated using sensors embedded in concrete test specimens. The results showed that the addition of red mud is beneficial to concrete, reducing its corrosion potential and increasing its electrical resistivity. Red mud proved to be a promising additive for concrete to inhibit the corrosion process.
Highlights
The world’s production of bauxite in 2009 was 205 million tons, and the main producing countries were Australia, China, Brazil, Guinea, India and Jamaica
The corrosion potential was monitored by electrochemical measurements and the electrical resistivity was evaluated using sensors embedded in concrete test specimens
The results showed that the addition of red mud is beneficial to concrete, reducing its corrosion potential and increasing its electrical resistivity
Summary
The world’s production of bauxite in 2009 was 205 million tons, and the main producing countries were Australia, China, Brazil, Guinea, India and Jamaica. Alkalinity greatly reduces the solubility of many hazardous inorganic species and inhibits microbiological processes Since these matrices require water for hydration, they may readily incorporate wet wastes [1] such as red mud. The high alkalinity of red mud, which was initially a factor of environmental concern, emerges as a major asset in the attempt to use red mud as an inhibitor of reinforced concrete rebar corrosion by retaining its passivity. To evaluate this possibility, rebar corrodibility was examined by corrosion potential and electrical resistivity measurements. We sought an alternative for two problems: corrosion in reinforced concrete, which consumes millions of dollars with the maintenance and revitalization of infrastructure, and the environmental damage caused by industrial solid waste disposal, one of the biggest questions to be solved in this century
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