Department of Civil Engineering

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Author: search.filters.author.Mambo Abdulhameed

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    Life Cycle Cost Analysis Of Asphalt And Soil Pavements In Abuja-Keffi Highway Road Using Real Cost 3.0 Software
    (Nile Journal Of Engineering and Applied Science, 2025-05-05) Offor George Ikechukwu; Muoka Anthony; Abubakar Dayyabu; Musa Umar Kolo; Mohammed Ado; Mambo Abdulhameed
    This study presents a Life Cycle Cost Analysis (LCCA) of the Abuja-Keffi Expressway, focusing on the Mararaba axis, to evaluate and compare the economic implications of two flexible pavement options: asphalt pavement and soil pavement. The research is motivated by the economic challenges faced by road engineers and contractors in Nigeria due to poor road conditions and the associated high maintenance costs. The study employs RealCost 3.0 software and follows a 35-year evaluation period methodology to account for all life cycle costs, including construction, maintenance, and user costs. The analysis considers design alternatives, agency costs, user costs, maintenance costs, and discount rates. The study compared two pavement alternatives, Asphalt Pavement (Alternative 1) and Surface Dressing Pavement (Alternative 2), focusing on key financial metrics such as the Undiscounted Sum, Net Present Value (NPV), and Equivalent Uniform Annual Cost (EUAC). The Undiscounted Sum, representing total expenses over the project's lifespan, reveals that Alternative 1 incurs $1,170,436.88(₦925,825,091.28), while Alternative 2 costs $441,433.94(₦348,878,774.54). Considering the time value of money, NPV is higher for Alternative 1 at $1,136,191.38(₦896,236,417.58), compared to $413,271.56(₦326,795,499.75) for Alternative 2. The EUAC, indicating uniform annual costs equivalent to NPV, is $41,060.38 (₦32,476,199.78) for Alternative 1 and $14,935.06(₦11,793,070.46) for Alternative 2. A higher NPV signals a financially attractive investment, while a lower NPV may suggest less economic viability, especially when factoring in the time value of money. The results highlight the economic benefits of asphalt pavement in the long term, considering durability and performance. The study recommends proper design and construction of drainage systems to reduce flooding, regular maintenance to extend pavement life for asphalt pavement, quality control in construction, and consideration of local conditions in pavement selection, while To minimize costly repairs or replacements surface dressing pavement in the future, regular maintenance such as sealing cracks and applying a sealant coat should be done to extend the life of the floor
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    Modification of Lateritic Soil Using Waste Plastics for Sustainable Road Construction
    (Multidisciplinary Digital Publishin Institute (MDPI), 2024-05-05) Obianyo Ifeyinwa Ijeoma; Taiwo Ibitayo Akintayo; Abubakar Dayyabu; Mahamat Assia Aboubakar; Amuda Akeem; Muoka Anthony; Mambo Abdulhameed; Azikiwe Peter Onwualu
    Lateritic soil, a prevalent geological material in tropical regions, often exhibits poor engineering properties, leading to road pavement failures. Meanwhile, the alarming rise in plastic waste poses environmental concerns. This innovative study explores the potential of utilizing waste plastics as a lateritic soil addictive for sustainable road construction. Varying percentages by weight of shredded waste plastic (2%, 4%, 6%, 8%, and 10%) were incorporated into lateritic soil samples, evaluating its effects on soil geotechnical properties. The results revealed that lateritized plastic (shredded plastic waste and lateritic soil) containing 2% shredded plastic waste gave the optimum maximum dry density of 1.985 g/cm3, and the lateritized plastic containing 10% shredded plastic waste gave the highest optimum moisture content of 18%. However, the lower California bearing ratio obtained on the addition of plastic waste showed that the lateritized plastic is relatively weak and can only be used for roads with low traffic. The incorporation of shredded plastic waste into lateritic soil for stabilization is a promising polymer science-based method. By reducing the need for conventional materials and diverting plastic waste from landfills, this approach contributes to a more environmentally friendly infrastructure supporting the achievement of United Nation Sustainable Development Goals.