THE INFLUENCE OF USING CEMENT KILN DUST (CKD) IN HOT ASPHALT MIXTURE
Cement Kiln Dust (CKD) is one of the most prevalent waste materials produced in large quantities during the cement production process. The influence of CKD as a filler material on the qualities of hot mix asphalt (HMA) such as stability, air voids, flow, and loss of stability was examined in this study. Different percentages of asphalt cement were investigated to determine the optimum asphalt content for the two mixtures. The optimum asphalt cement percent for the best results of unit weight, stability, and air voids is ranging from (3 – 5) percent. According to the obtained results, the use of CKD filler instead of limestone resulted in a higher optimal binder concentration in HMA mixtures. There was no noticeable difference in Marshall Stabilities between the mixtures that included limestone filler and those included 5% CKD. However, it was noticed that adding 5% CKD to the limestone HMA mixtures increased indirect tensile strength (ITS) by 16.67% after 96 hours.
Asphalt mixture, Cement Kiln Dust, Limestone, Optimum Asphalt Content, Stability