| Title |
High-Strength Construction Material from Raw Bauxite Residue by One-Step Alkali Activation |
| ID_Doc |
29844 |
| Authors |
Di Mare, M; Ouellet-Plamondon, CM |
| Title |
High-Strength Construction Material from Raw Bauxite Residue by One-Step Alkali Activation |
| Year |
2023 |
| Published |
Journal Of Sustainable Metallurgy, 9.0, 1 |
| DOI |
10.1007/s40831-022-00633-6 |
| Abstract |
An alkali-activated material composed of 77% raw, unmodified bauxite residue has been developed that meets the mechanical strength standards for construction materials. This can solve the circularity gap in aluminum production by providing a means to valorize bauxite residue in large volumes in the construction sector. This environmentally friendly building material leverages a novel one-step mixing process to dramatically increase the proportion of bauxite residue contained in the material without the need for calcination. The alkali-activated material achieves over 30 MPa of strength after 3 days of curing, satisfying the ASTM standards for precast structural members. The microstructure has been characterized by mercury intrusion porosimetry and isothermal nitrogen adsorption. The leaching of metallic and nonmetallic pollutants from the material is substantially below the maximum allowable concentration in Quebec, Canada, the origin of the bauxite residue. This alkali-activated material is a circular economy solution to valorize large contents of bauxite residue in construction applications such as retaining wall members, underground utility lines, and other infrastructure while reducing the environmental impact of the aluminum industry. |
| Author Keywords |
Bauxite residue; Red mud; Alkali-activated materials; Inorganic polymer; Leaching pacification; Compressive strength |
| Index Keywords |
Index Keywords |
| Document Type |
Other |
| Open Access |
Open Access |
| Source |
Science Citation Index Expanded (SCI-EXPANDED) |
| EID |
WOS:000894375800001 |
| WoS Category |
Green & Sustainable Science & Technology; Metallurgy & Metallurgical Engineering |
| Research Area |
Science & Technology - Other Topics; Metallurgy & Metallurgical Engineering |
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