https://ajesa.com.ng/index.php/AJESA <p>ADVANCED JOURNAL OF ENGINEERING AND SCIENTIFIC APPLICATIONS (AJESA) is an academic/technical Journal of engineering and applied sciences published by the Nigerian Institute of Electrical and Electronic Engineers (NIEEE) Awka Chapter covering all fields of Engineering and Engineering Sciences such as Mechanical Engineering, Safety and Fire Engineering, Civil Engineering, Electrical and Electronic Engineering, Computer Engineering, Communication Engineering, Computer Science, Software Engineering, Cybersecurity, Information Technology, Entrepreneurship Studies, Chemical Engineering, Petrochemical Engineering, Water Engineering, Highway Engineering, Materials and Metallurgical engineering, current trends in Artificial Intelligence, Robotics and Machine Learning, Polymer Engineering, etc.</p> <p>The Journal is an open-access online journal publishing double-blind peer-reviewed research papers in every area of engineering and scientific applications related to engineering and engineering sciences and sub-fields. It is published every month within two-months interval, but paper submission is open every month.</p> en-US drfcobodoeze@gmail.com (Engr. Dr. Fidelis C. Obodoeze PhD, MNSE, NIEEE, FIIA) vc.onuzulike@unizik.edu.ng (Engr. Dr. Vincent C. Onuzulike PhD,MNSE,NIEEE ; Department of Electronic and Computer Engineering, Nnamdi Azikiwe University, Awka, Nigeria) Tue, 19 May 2026 00:00:00 +0000 OJS 3.3.0.7 http://blogs.law.harvard.edu/tech/rss 60 https://ajesa.com.ng/index.php/AJESA/article/view/52 Black cotton soil (BCS) is a widely distributed expansive clay with poor engineering behaviour, characterised by high volume change, susceptibility to cracking and low strength, which renders it unsuitable in its natural state for infrastructure applications. Stabilisation with agro-industrial by-products offers a cost-effective and environmentally sustainable alternative to conventional chemical admixtures. This study evaluates the geotechnical suitability of corn cob ash (CCA)-modified BCS for use as compacted liner and cover material in municipal solid waste containment facilities. The natural BCS and CCA blends (0, 4, 8, 12 and 16% by dry weight) were subjected to classification tests, standard compaction at three energy levels (British Standard Light — BSL; West African Standard — WAS; British Standard Heavy — BSH), unconfined compressive strength (UCS) at four moulding water contents (OMC − 2%, OMC, OMC + 2%, OMC + 4%), volumetric shrinkage strain (VSS), long-term hydraulic conductivity (k) permeated with municipal solid waste leachate. All tests followed BS 1377 (1990) and BS 1924 (1990) protocols. The natural BCS was classified as A-7-6 (13) (AASHTO) and CH (USCS). CCA addition reduced plasticity and modified compaction parameters. At 16% CCA compacted with BSH energy and within a moulding water content range of 13.5–15.5%, UCS values exceeded 200 kN/m², VSS values fell below 4%, and hydraulic conductivity remained at or below 1 × 10⁻7 cm/s satisfying all three liner design thresholds simultaneously. Black cotton soil blended with 16% CCA and compacted with not less than BSH compactive energy fulfils the principal design parameter requirements for use as liner and cover material in municipal waste containment facilities, offering a viable, low-cost, and ecologically responsible construction alternative in regions where CCA is abundantly available. John E. Sani, Abdulhamid Dauda, Kabiru Adebayo, George Moses, Vivien C. Ameso Copyright (c) 2026 ADVANCED JOURNAL OF ENGINEERING AND SCIENTIFIC APPLICATIONS https://creativecommons.org/licenses/by-nc/4.0 https://ajesa.com.ng/index.php/AJESA/article/view/52 Tue, 19 May 2026 00:00:00 +0000 https://ajesa.com.ng/index.php/AJESA/article/view/53 Motorcycle transportation is an essential yet hazardous component of urban mobility in Ilorin, Nigeria, contributing significantly to road traffic injuries and fatalities. This study aimed to evaluate the causes, annual trends, and spatial patterns of motorcycle accidents in the metropolis while validating official records against victim reports. A mixed-methods research design was implemented, utilizing primary data from 384 questionnaires administered to motorcyclists, victims, and healthcare professionals, alongside 10-year secondary records (2015–2024) from the Federal Road Safety Corps. Analytical tools included SPSS and Microsoft Excel for statistical trends, while ArcMap 10.8’s Kernel Density tool was used for spatial mapping. Results indicate that accidents are predominantly driven by behavioral factors, specifically intoxication (53.02%) and speed violations, with key flashpoints identified at Maraba, Post Office Area, and Fate Roundabout. Notably, the validation of official data revealed a very weak correlation between victim reports and institutional records (R² = 0.072; p = 0.606), suggesting potential recall bias and reporting gaps. The study concludes that motorcycle accidents in Ilorin are shaped by a synergy of risky rider behavior and infrastructure deficits. Consequently, enhancing road safety requires a multifaceted strategy involving stricter traffic enforcement, public sensitization campaigns, infrastructure upgrades, and improved emergency medical response logistics. Abdulganiyu Tunde Ogunbiyi, Biliyamin A. Ibitoye, Mariam Funmilayo Daudu, Na’Allah Abdulmumin Bolaji , Muktar Oladapo Raji, Mohammed Abdulkareem Adisa Copyright (c) 2026 ADVANCED JOURNAL OF ENGINEERING AND SCIENTIFIC APPLICATIONS https://creativecommons.org/licenses/by-nc/4.0 https://ajesa.com.ng/index.php/AJESA/article/view/53 Tue, 19 May 2026 00:00:00 +0000