Cement Kiln ~ust (CKD) from Al-Yamamah Cement plant in Riyadh, wasadded to different soils
(A-4, A-2-4, and A-1-b) to study its stabilizing effect on the properties of these soils. Itwas
found, in general, @d for the CKD'contents used ( 4, 10, and 16%) that CKD lowers plasticity,
increases pH value, increases optimum moisture content and lowers the maximum dry density of
those soils. There was an increase in California bearing ratio (CBR) and unconfined compressive
strength due to CKD addition. 'Increasing the amount of CKD mer. increases its effect on the
above properties.