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

Bonal, Niteesh Singh; Prasad, Arun; Verma, Abhay Kumar

doi:10.1061/(asce)cr.1943-5495.0000281

Cited by 1 publication

(1 citation statement)

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“…Additionally, scientists have conducted extensive research to explore non-traditional additives to minimize the damage in recent years. These include using fly ash [27], alkali-activated volcanic ash, and slag [28], biological approaches such as microbial-induced biopolymers [29], phase change material (PCM) [30], recycled ash along with natural fibers [31], mixing fibers with cement and soil [32], employing chemicals and polymers like polyacrylamide (PAM) [33], utilizing recycled materials [20,34], or incorporating materials such as rice husk ash [35]. However, despite all these methods increasing the ultimate strength of the soils after F-T cycles compared to untreated soil, a common characteristic among all these stabilizers is a subsequent loss of strength after successive cycles compared to their initial strength before experiencing F-T cycles.…”

Section: Introductionmentioning

confidence: 99%

Effect of Magnesium Chloride Solution as an Antifreeze Agent in Clay Stabilization during Freeze-Thaw Cycles

Yeganeh Rikhtehgar,

Teymür

2024

Applied Sciences

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Freeze-thaw cycles significantly impact construction by altering soil properties and stability, which can lead to delays and increased costs. While soil-stabilizing additives are vital for addressing these issues, stabilized soils remain susceptible to volume changes and structural alterations, ultimately reducing their strength after repeated freeze-thaw cycles. This study aims to introduce a different approach by employing magnesium chloride (MgCl2) as an antifreeze and soil stabilizer additive to enhance the freeze-thaw resilience of clay soils. We investigated the efficiency of MgCl2 solutions at concentrations of 4%, 9%, and 14% on soil by conducting tests such as Atterberg limits, standard proctor compaction, unconfined compression, and freeze-thaw cycles under extreme cold conditions (−10 °C and −20 °C), alongside microstructural analysis with SEM, XRD, and FTIR. The results showed that MgCl2 reduces the soil’s liquid limit and plasticity index while enhancing its compressive strength and durability. Specifically, soil treated with a 14% MgCl2 solution maintained its volume and strength at −20 °C, with similar positive outcomes observed for samples treated with 14% and 9% MgCl2 solutions at −10 °C. This underlines MgCl2′s potential to enhance soil stability during initial stabilization and, most importantly, preserve it under cyclic freeze-thaw stresses, offering a solution to improve construction practices in cold environments.

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