Abstract: A total of 354 samples of fresh filtered, natural consolidated and compacted red mud cakes are tested for moisture, unit weight, specific gravity, dry density, void ratio, degree of saturation, permeability, grain size distribution, consolidation, consolidated and undrained shear test and triaxial shear test. The test results indicate that the freshly filtered red mud cakes have the geotechnical properties similar to that of silty soils. It has the characteristics of high moisture contents, high degree of saturation, high void ratio and low shear strength. The red mud samples are wellgraded. The optimum moisture content under the Proctor test is 41.6% with a maximum dry density of 1.25g/cm3. The shear strength of the red mud samples prepared under the optimum moisture content has a significant increase. An increase of shear strength of red mud samples with time of storage is also observed. These findings provide references for the red mud of aluminum plant storage and the design and construction red mud storage dams.

Key words: Red Mud Cakes, Physical and Mechanical Properties