Clay soil stabilization using cement kiln dust

Abstract

This research investigated the suitability of cement kiln dust (CKD) on the stabilization of clayey soil extracted along a failed road section of Sango, Ota. Since CKD does not need any further processing or treatment, it is cheap as it is a waste product from cement production and can be utilized in powdery form. The suitability of CKD as a stabilizer is dependent on its performance on problematic soil. For this study, it was mixed with clayey soil in varying proportions of 7.5, 10, 12.5 and 15%. For each combination, several geotechnical tests were carried out. The result shows that the unsoaked CBR of the clay soil increased from 1.49 to 28.6%, and thus indicates that the soil mixed with 10% CKD showed the best mechanical improvement after a curing period of 7 days. Other curing periods were observed. In addition to CBR improvement, other tests such as Atterberg limits, Proctor compaction, and free swell, tests revealed that the geotechnical properties of the stabilized soils increased with an increase in the amount of CKD by dry weight of the soil. It is noted that the use of CKD at 10% was more economical and environmentally beneficial. This research shows the beneficial use of industrial wastes such as CKD in the stabilization of soils, which is line with sustainable waste management practices.