Browsing by Author "Amuda Akeem Gbenga"

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    Microstructure of Black Cotton Soil Stabilized with Agricultural and Industrial Waste.
    (Nile Journal Of Engineering and Applied Science, 2024-05-05) Kolawole O; Amuda Akeem Gbenga; Abubakar Dayyabu; Mambo Abdulhameed
    Black cotton soil (BCS) is known to be expansive and very challenging when encountered during the construction of roads. Conventional stabilizing materials such as cement and lime are expensive. On the other hand, industrial and agricultural waste with pozzolanic properties are littered in factories and difficult to discard. This paper examined the microstructure of BCS soil stabilized with marble dust, MD, and Rice husk ash, RHA. About seven different mix ratios for MD and RHA are considered for 10% replacement in BCS. Pure BCS was also analyzed as a control. Atterberg limits were investigated for various mix ratio to understand the change in index properties. The SEM micrographs for the control samples show a loose pack of natural BCS with a sponge-like and hollow look. Generally, the SEM results for all the other samples show that the hollow perforated structure of the black cotton soil was reduced. The EDX shows the element present in each mix ratio with a mix ratio of 90:10 and 100:0 for MD: RHA as the appropriate mix.
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    Performance evaluation of asphaltic concrete produced using glass waste and eggshell as alternative fillers.
    (Nile Journal Of Engineering and Applied Science, 2025-05-05) Otronyi Stephen Okojo; Abubakar Dayyabu; Yakubu Muktar Sakadadi; Amuda Akeem Gbenga; Mambo Abdulhameed; Muoka Anthony
    Reliance on non-renewable natural resources in pavement construction poses environmental and sustainability challenges, hence possible incorporation of wastes becomes novel. This study investigates the performance of asphalt modified with glass waste and eggshell powder as alternative fillers. The materials were selected due to their distinct compositions: glass, predominantly silica-based, enhances stiffness which prevent cracks and reduces premature pavement distress, while eggshell, rich in calcium carbonate, improves adhesion and moisture resistance of pavement. Glass waste was collected, grounded and sieved through 0.075mm, also eggshell was collected, washed, dried, pulverized and sieved through the 0.075mm as required. XRD/SEM analysis was performed on the wastes to confirmed their silicate and calcium carbonate content. Marshall asphaltic concrete samples were prepared using the conventional fillers and tested for the optimum bitumen content determined as 6.53%. The optimum bitumen content was used to produce the modified asphalt with combined glass waste and eggshell as fillers at (0, 6, 12 and 18%) proportions. The modified samples were tested for stability, flow, indirect tensile strength (ITS), and moisture susceptibility. All proportion’s result met the AASHTO and Nig. Min. of works specifications, with TSR values exceeding the AASHTO minimum of 80%, indicating excellent resistance to moisture-induced damage. Notably, the inclusion of eggshell powder improved the mixtures' anti-stripping properties compared to glass dust alone. Therefore, glass waste and eggshell can be combined and incorporated into asphalt mix as fillers up to 18% and will reduce the environmental challenges of wastes, cost-effective asphalt, promoting resource conservation and sustainability. Further studies are recommended to evaluate other engineering performance parameters.