Capability of Reused Waste from Aluminum Industry (Red Mud) in Iran to Improve Compressive Strength of Loose Soil

Jajarm Alumina Plant, the only Alumina powder producer in Iran, generates 500,000 tons of red mud annually. The commonest method for final disposal of red mud in Iran is Tailing dam which is neither cost-effective nor environmentally-friendly. The main objective of this study is to evaluate the possibility of red mud recovery to be used for stabilization of loose soils. Red mud samples have been collected from tailing dam of Jajarm Alumina Plant to be characterized, using X-Ray Fluorescence (XRF). The soil stabilizer has been made by mixing red mud, steel slag, sodium metasilicate, and sodium hydroxide. In order to study the effect of soil stabilizer, five soil samples have been prepared which contain clay, sand, and wind-blown sand ranging from zero to 4 millimeters. Findings show that adding soil stabilizer with red mud significantly enhances compressive strength of soil samples (4.2, 18.2, 5.4, 4, and 4.1 in S1 to S5 samples, respectively). Also the results demonstrate that the red mud, produced from Aluminum industry in Iran, might be successfully used to stabilize loose soils, thereby enhancing their compressive characteristics, reducing environmental issues associated with uncontrolled disposal of such wastes as well as promoting integrated solid waste management strategies.