2DEPARTMENT OF CIVIL AND ENVIRONMENTAL

E-mail address This study was carried out to evaluate the effect of high loss on ignition content cement kiln dust on the stabilization of highway expansive soils. in accordance with BS 1377 (1990) and the expansive soil (also known as black cotton soil Silt-Clay material of Group A-7-6 (16) using AASHTO classificatio Unified Soil Classification System (USCS). The maximum dry density (MDD) for British Standard Light (BSL) and British Standard Heavy (BSH) compactive efforts increased to peak values of 1.66 and 1.91 Mg/m cement kiln dust (CKD) contents respectively. The MDD for West African Standard (WAS) compactive effort increased with higher CKD content. The Optimum Moisture Content (OMC) for BSL and BSH compactive efforts increased up to 6 % CKD content then decreased with higher CKD content. For the WAS compactive effort, the OMC generally decreased with higher CKD content. the natural soil compacted with BSL, WAS and BSH compactive effo 10 % CKD content. The 24 hour soaked CBR values of the natural soil compactive energies, respectively increased to their content