engleski

Understanding the effect of bauxite residue on properties of cementitious composite

The cement industry is looking for sustainable solutions and energy-efficient binders to reduce environmental impact. Locally available supplementary cementitious materials offer a good opportunity to minimise CO2 emissions associated with cement production. However, with the introduction of alternative materials in cementitious composites, the properties of the composites may change significantly. Changes in physical and chemical properties can also have a major impact on durability. One of the supplementary cementitious materials being studied is bauxite residue, also known as red mud. Due to its fine particle size, high alkalinity, and relatively high alumina content, its use in cementitious materials could be beneficial. Although there is still a gap in knowledge about this material, some previous studies indicate positive interactions between red mud and fly ash and red mud and clay. The objective of this study is to investigate the reactivity of non-calcined red mud and the possibility that red mud forms carboaluminate phases in synergy with other supplementary materials in cementitious composites. The formation of these phases could provide for a reduction in porosity and an increase in strength of the composite while reducing its environmental footprint and contributing to proper waste management of industrial residues.

SCM, red mud, cement hydration, durability, synergy

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