Utilization of Modified Red Mud Waste from the Bayer Process as Subgrade and Its Performance Assessment in a Large-Sale Application

The utilization of red mud waste discharged from the Bayer production process used for extracting alumina bauxite presents a pressing demand in aluminum industry. This study aims to adopt chemical modifier solidify its application highway subgrade. mechanism and properties modified using composed cement, phosphogypsum organic polymer, were analyzed investigated. It was found that optimal dosage solidified 8%. three-day unconfined compressive strength could reach up 3 MPa loss when immersed water at 7 days 28 measured less than 20%. For real as subgrade, road performance be achieved with good bearing capacity, including resilient modulus value greater 90 MPa, dynamic deformation reaching 140 Falling Weight Deflectometer (FWD) measuring 100 (0.01 mm). Compared traditional lime or cement stabilized soil, locally subgrade filling can reduce project cost, minimize consumption non-renewable resources emission environmental hazards, thus providing an engineering reference large-scale resource-based applications.