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Dynamic characteristics of treated and untreated Bauxite Residue (Red Mud) are studied and compared using a cyclic simple shear device. Red Mud (RM) is the by-product waste from the Bayer process during aluminum production that has shown the potential of being reused as fill material in embankment construction, which can reduce the energy consumption of disposing of the mining waste and producing fill materials. There are limited studies on the dynamic characteristics of RM; furthermore, the bauxite slurry’s high alkalinity (pH > 12) is a challenge for reusing the material. Past studies have shown two effective and economic neutralization methods: (1) mixing with saline and (2) adding gypsum. This study utilizes a cyclic simple shear device to characterize the dynamic properties of the treated and untreated Red Mud. The experimental results are used to develop the liquefaction capacity curves for the three types of Bauxite Residue: untreated, treated with saline solution, and treated with gypsum, and the results show different liquefaction resistances after pH treatments. Untreated RM specimens show the highest liquefaction resistance, and saline-treated demonstrated the least liquefaction resistance.