The Use of Burned Sludge as a New Soil Stabilizing Agent

This paper presents the use of burned sludge ash as a soil stabilizing agent. The sludge was burned at 550° C and mixed with three different types of clayey soil at different percentages. A laboratory study consisted of the following tests were carried out on samples treated with burned sludge: Atterberg's Limits, Unconfined Compressive Strength, Standard Proctor Density, and Swelling Pressure tests. It was found that the addition of 7.5% by dry weight of the burned sludge ash will increase the unconfined compressive strength and the maximum dry density, while the addition of 7.5% of the burned sludge by weight of the dry soil minimizes the swelling pressure of the soil. The addition of percentages grater than 7.5% by weight will decrease both the maximum dry density and the unconfined compressive strength. The test results show that this material can be used as a soil stabilizer