Journal
INTERNATIONAL JOURNAL OF MINING RECLAMATION AND ENVIRONMENT
Volume 29, Issue 6, Pages 433-452Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/17480930.2013.830906
Keywords
red mud; waste; liner; geotechnical properties; permeability; landfill
Funding
- Xunta de Galicia (Plan galego de investigacion, innovacion e crecemento-I2C, Conselleria de Educacion e Ordenacion Universitaria)
- European Social Fund
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Red mud (RM), a waste arising from the bauxite refining, was studied to assess its suitability as a compacted liner material. The geotechnical and hydraulic conductivity (K) characteristics of the RM, as well as the effect of desiccation, were evaluated. RM has index properties satisfying the requirements to achieve low K. The compaction-permeability studies showed that RM may be compacted to a dense homogeneous mass using a moderate compactive effort, while lowest K (1x10(-7)cm/s) was achieved for RM compacted slightly (0.4-4%) wet of optimum. Shear strength test revealed high values of friction angle and cohesion for compacted RM, and its tight structure was also evidenced by its low compressibility and maximum settlement under load. Desiccation adversely affected the permeability of compacted RM, but to a lesser extent than generally observed for clays. These results suggest that RM could be potentially utilised as a low-permeability barrier to be laid down under engineered landfill sites.
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