Effect of Thermogelation Biopolymers on Geotechnical Properties of Red Mud Tailings Exposed to Freeze and Thaw

Abstract

In cold regions, the construction of engineered structures such as roads and embankments experiences alternate freezing and thawing cycles, thus affecting their long-term stability or durability. This research aims to investigate the impact of freeze–thaw cycles on the geotechnical characteristics of red mud tailing (bauxite residue) stabilized with two biopolymers, guar gum (GG) and xanthan gum (XG). The effect of elevated temperature during sample preparation (thermogelation) on the strength and durability was also studied. Red mud tailing samples stabilized at various concentrations (0.25%, 0.5%, 1%, and1.5%) and curing periods (7, 14, and 28 days) were exposed to 10 freeze–thaw cycles. The results showed the efficacy of thermogelation biopolymers in enhancing the compressive strength and freeze and thaw resistance compared to other treated conditions. Also, post-freeze–thaw conditioning, the results showed maximum recovery of strength at 14 days of curing period when the temperature was constantly above 0°C. The findings postulated the biopolymer as a promising, environmentally friendly material for road constructions (particularly for subbase and shoulder) in cold regions.