Stabilization of Expansive Soil Using Tire Rubber Powder and Cement Kiln Dust

There are different techniques to stabilize and improve the properties of soils with low shear strength, bearing capacity and other swelling parameters. This study includes the chemical analysis of expansive soils using X-ray diffraction (XRD) and scanning electron microscopy (SEM) before and after the stabilization using tire rubber powder (TRP) and cement kiln dust (CKD) in order to evaluate the geotechnical properties. Test results indicate that the inclusion of CKD-TRP mixture, not only reduces the plasticity of soil but also increases its unconfined compression strength, maximum dry density, and other strength characteristics. Finally, 5% TRP and 10% CKD addition is recommended as an optimum amount from the viewpoint of plasticity and strength characteristics.