Browsing by Author "Steven Kisitu"

Now showing 1 - 1 of 1
  • Thumbnail Image
    Item
    Investigating the Use of Lime Kiln Dust as a Filler in Asphalt Concrete for Durable Flexible Pavements
    (2024-04-08) Steven Kisitu
    Primarily utilized in Uganda, flexible pavements are made of bitumen, aggregates, and mineral filler. Investigating the use of lime kiln dust as a mineral filler in asphalt concrete for long-lasting flexible pavements in proportions by mass of the active filler of 4% was the primary goal of this study. The Marshall test, determining the engineering parameters of bitumen, aggregates, and mineral filler, as well as measuring the asphalt mixtures' indirect tensile strength (ITS), were the primary techniques employed. For each mix, a number of factors need to be ascertained, including Marshall stability, flow, unit weight, air voids (Va), voids filled with asphalt (VFA), and voids in the mineral aggregate (VMA). Air voids decreased from 5.7% to 4.9%, Marshall stability increased from 14.8 to 17.1%, and indirect tensile strength wet strength increased from 81% to 90% as a result of using lime kiln dust. Findings suggested that adding 4% of lime kiln dust filler increased the stability and stiffness of asphalt mixtures, enhancing their resistance to rutting; however, experiments utilising different percentages of lime kiln dust should be experimented. Accordingly, this study demonstrates that 4% lime kiln dust can be added to asphalt concrete as a mineral filler to decrease air voids, increase mix stability, and eventually strengthen the asphalt mixture's rigidity and durability.