Analysis of porous alkali activated materials using bauxite residue as principal precursor

Guha, Rhea et Ouellet-Plamondon, Claudiane M.. 2024. « Analysis of porous alkali activated materials using bauxite residue as principal precursor ». Journal of Building Engineering, vol. 96.

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Résumé

Bauxite residue is a red-hued and mineral-rich material that is released from the production of alumina during the Bayer process. There are large areas of land across the world dedicated to the storage of this underutilized material. The growing nature of the alumina-producing industry implies that the production of bauxite residue will increase, which necessitates solutions for valorizing bauxite residue. One area of research involves using bauxite residue as a precursor in preparation of porous alkali activated materials and the novelty of the study is to make porous alkali-activated material with bauxite residue. Porous AAMs have applications as industrial adsorbents and as insulating materials. This study focused on the pore analysis of AAMs prepared with a high proportion of bauxite residue and fly ash addition, using varying percentages of hydrogen peroxide and added water to form the pore structure, with hydrogen peroxide and water acting as a “green reagent”. The sample containing the highest percentage of added water displayed the highest open porosity, with the sample consisting of large millipores and the widest distribution of pore sizes out of all the samples. The samples containing only hydrogen peroxide displayed a uniform distribution of smaller pores as measured by nitrogen adsorption. The study describes a process to create highly porous AAMs in low temperatures using a limited number of constituents. Furthermore, it optimizes the variation of hydrogen peroxide and added water to tailor the pore character depending on the desired application of the material, with only as much as 3% hydrogen peroxide needed for porosity. The porous alkali-activated bauxite residue has the potential to be used as insulating material in the building.

Type de document:	Article publié dans une revue, révisé par les pairs
Professeur:	Professeur Ouellet-Plamondon, Claudiane
Affiliation:	Génie de la construction
Date de dépôt:	04 sept. 2024 19:47
Dernière modification:	06 sept. 2024 13:24
URI:	https://espace2.etsmtl.ca/id/eprint/29379

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