This study demonstrates how synthetic coarse aggregates from bauxite residue improve mechanical strength and durability in concrete, suggesting a sustainable alternative.
Background: The bauxite residue, also known as red mud, is a byproduct of the bauxite beneficiation process through the Bayer method, generated in large volumes and with significant environmental challenges. To minimize its impacts, this study proposes the production of synthetic coarse aggregates (SCA) from this residue, aiming for its application in Portland cement structural concrete. Materials and Methods: The production process involved a preliminary step and three optimization cycles, with tests for evaluating chemical composition, bulk density, granulometry, shape index, water absorption, mechanical strength, and durability. Results: In the third cycle, the aggregates achieved satisfactory geometric conformation, adequate strength, and good durability, although water absorption still needs to be reduced. Conclusion: The results demonstrate the potential of this material as a sustainable alternative for the substitution of natural aggregates, contributing to the reduction of environmental impacts from mining
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Fernandes et al. (2025) studied this question.
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