Browsing by Author "Peace Natangaza"

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    Assessing the Stiffness Properties of Asphalt Concrete Modified With Waste Diesel Engine Oil. Acase Study of Kampala- Masaka Road
    (Uganda Christian University, 2025-04-29) Peace Natangaza
    This study explored the possibility of modifying bitumen with Waste Engine Oil (WEO) to help mitigate cracking in asphalt pavements. Laboratory investigations were conducted on bitumen of 50/70 penetration grade with WEO additions of 0-6%. In all experiments with WEO, the penetration increased from 62.2 to 73.4 mm, and all other physical properties measured decreased; notably the softening point (from 54.2 to 45.5° C) and density of the bitumen (from 1.018 to 0.999 g/cm³). Marshall Mix Design implied that 4.6% was the optimal bitumen content, while the 3.5% WEO mixture had superior performance, workability and fatigue resistivity to the other mixtures. The results showed a very good moisture resistivity with a Tensile Strength Ratio of 92%. The findings from this study implied that for areas like Kampala- Masaka, Uganda, it is feasible to modify bitumen with up to 4% WEO to sustainably enhance pavement performance, improving the longevity of the pavement and delaying maintenance requirements. It is indicated that wide scale field studies be undertaken to monitor the impact of these laboratory studies in the field.