Anbar Journal for Engineering Sciences

Abstract

The white cement Kiln dust (WCKD) is a secondary production from the
cement industry through its production operation. Environmentally, it is considered as
an unwanted waste because it causes air pollution and ground congealment, and it is
needed great efforts and financial support to disposal it. In this study, the WCKD was
used partially instead of limestone as a filler in the asphalt mix, where it was used by
ratios of 0%,25%,50%,75% and 100% from the weight of limestone. An evaluation
of the mechanical characteristics was conducted by carrying out Marshall test and
Indirect Tensile test, and the results showed that the increase in the WCKD percent
reduces the asphalt mix density and increases the percentage of air voids, while the
other characteristics (stability, Marshall Stiffness, flow and Indirect Tensile Strength)
increase when the WCKD ratio is 25% and 50%. These those characteristics start
decreasing when the WCKD ratio was 75% and 100%. The study showed that the
optimum ratio of the WCKD is 50% from the limestone weight, and the WCKD
cannot be used as a filler entirely in asphalt mix, but it can be used partially.