Browsing by Author "Abbas, U."

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    Mechanical performance of structural concrete utilising porcelain insulator ceramic waste as partial replacement for coarse aggregates
    (2025) Kabiru, R. U; Abbas, U.; Hassan, A.; Muhindo, D.
    The increasing environmental impact of natural aggregate extraction and the growing accumulation of ceramic waste have prompted the search for sustainable construction materials. This study investigates the feasibility of using ceramic waste from waste electric insulators as partial replacement for natural coarse aggregates in concrete production. The ceramic waste from waste electric insulators termed here as porcelain insulator ceramic waste (PICW) sourced from local dumpsites was processed and incorporated into concrete mixes at replacement levels of 0%, 15%, 30%, 50% and 75%. Coarse aggregates of maximum size 20 mm were used in this study. The ceramic waste from waste electricity insulators was crushed using a hammer up to size 20 mm as indicated in the particle size distribution. Grade 25 of concrete was designed for in the mix design. Laboratory tests, including sieve analysis, moisture content, specific gravity, water absorption, workability (via slump testing), and compressive strength were conducted to assess the mechanical and physical properties of both fresh and hardened concrete at curing intervals of 7, 14, and 28 days. The findings indicate that concrete containing up to 30% ceramic waste exhibits highest cempressive strength and workability comparable to conventional concrete without compromising its durability and workability, demonstrating its potential as a viable and eco-friendly alternative. The highest compressive strengths were recorded with 15% and 30% at 25.7 and 25.5 MPa respectively. Conversely, tensile strength declines with increasing PICW replacement at 28 days thus 3.32, 3.16, 2.99, 2.31 MPa. The study underscores the dual benefits of reducing construction costs and promoting sustainable waste management, making ceramic waste a promising material in the pursuit of green construction practices i.e., sustainable construction by mitigating environmental degradation and promoting circular waste utilization. The study offers valuable insights for future standards development and large-scale industrial applications.
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    Optimal Pavement Maintenance Strategy Based on the Relationship Between Pavement Condition Index and Roughness
    (7th FUTA Engineering Conference, 2024) Kabiru, R. U.; Abbas, U.; Hassan, Aliyu; Terseer, A; Muhindo, D
    Pavement maintenance is crucial for ensuring road safety, reducing congestion, and minimizing repair costs. However, determining the optimal timing and strategy for pavement maintenance remains a challenge. This study investigated the correlation between the Pavement Condition Index (PCI) and Roughness Index (RI) to develop a numerical model for describing relationship of the two indices for pavement maintenance decision-making. Using statistical analysis and data visualization techniques, a significant correlation was found between PCI and RI. The study revealed a moderate correlation between PCI and IRI (R² = 0.47), indicating that 47% of PCI variations can be explained by IRI. While this suggests that the model is capturing a significant amount of the relationship between PCI and IRI, there is still room for improvement, as about 53% of the variance in PCI is not explained by the model. Since the PCI is a measure of road pavement conditions (on a scale typically ranging from 0 to 100), an RMSE of 7.77 means that the model's predictions for PCI are, on average, about 7 to 8 PCI units off from the actual value. The study established a clear relationship between pavement condition and surface roughness, enabling the development of a model to guide maintenance decisions. The study recommends prioritizing roads with PCI ≥ 50.3 and RI ≤ 5.12 m/km, alongside regular monitoring to ensure timely, cost-effective maintenance. Regular monitoring of PCI and RI values is also recommended to ensure timely maintenance and prevent costly repairs.