<b>Characterization of Red Mud as a Construction Materials Using with Natural Soil</b> Soil is very important in civil engineering constructions. The poor engineering properties of the local soils may present many difficulties for construction and therefore need to improve their engineering properties. Stabilization techniques can be used to improve the properties of soil. Soil stabilization improves various engineering properties e.g. bearing capacity, compressibility, strength, and various other properties of soil. In this study the impact of Red Mud to improve the strength of soil. The soil was stabilized with Red Mud in stepped concentration of 5 , 10 , 15 , 20 , 25 and 30 by dry weight of the soil individually. All stabilized soil samples were also cured for 96 hours for CBR test in fully saturated condition. The test results indicate that the addition of Red Mud enhances the percentage of grain size distribution, but with addition of Red Mud till 20 the LL, PL,PI and decreases, while these parameters further increases in this limit beyond i.e. 20 to 30 of Red Mud, but in the case of The optimal percentage of Red Mud at which maximum CBR is achieved is selected, Specific gravity value of Natural Soil is 2.57, but as of Red Mud is increases, specific gravity value decreases gradually from 2.57 to 2.44 with increase in percentage of Red Mud from 0 to 30 and value of raw soil is achieved as 1.85 gm cc at OMC of 13.65 . It got increased to 1.93 gm cc at OMC of 12.30 when Red Mud is increased from 0 to 20 is effective beyond also there is decreasing in MDD from 1.93 gm cc at OMC of 12.30 to 1.89 gm cc at OMC of 13.20 when Red Mud is increased from 20 to 30 . The CBR value increases with the addition of Red Mud till 20 , while it decreases beyond the limit 20 to 30 with addition of Red Mud. For both soaked and unsoaked condition. Red Mud, OMC, MDD, Un Soaked CBR, Soaked CBR, Stepped concentration 49-51 Issue-6 Volume-5 Sourabh Gupta | Dr. Anil Kumar Saxena