Influence of Cement Kiln Dust on Strength and Stiffness Behavior of Subgrade Clays

摘要

A comparative laboratory study was conducted to evaluate the suitability of different percentages of cement kiln dust (CKD) for stabilizing three different types of subgrade clays. Cylindrical specimens were compacted and cured for 28 days in a moist room having a constant temperature and controlled humidity. After curing specimens were tested for unconfined compressive strength (UCS), modulus of elasticity (M_E) and resilient modulus (M_r). These properties were compared with those of the raw clay specimens to determine the extent of enhancement. The study revealed that the addition of CKD substantially increased the UCS, M_E and M_r values of the clay specimens. In addition, these improvements increased with the increase in the amount of CKD. The extent of improvement, however, was found to be dependent upon the characteristics of the clay such as plasticity index (PI) and silica/sesquioxide ratio (SSR).