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All Journal Jurnal Ilmiah Teknologi dan Rekayasa Journal of Engineering and Management in Industrial System Jurnal Mechanical Journal of Infrastructural in Civil Engineering (JICE) Makara Journal of Technology Journal of Sustainable Construction
Unegbu, Hyginus Chidiebere Onyekachi
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Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Electrical & Electronics Engineering Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Transportation

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Development and Characterization of Advanced Recycled Hybrid Metal Matrix Composites via Enhanced Stir Squeeze Casting Method for Industrial Applications Unegbu, Hyginus Chidiebere Onyekachi; Yawas, Danjuma S.
JURNAL MECHANICAL Vol 15, No 2 (2024): JURNAL MECHANICAL
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Lampung

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Abstract

This study presents the development and characterization of advanced recycled hybrid metal matrix composites (HMMCs) using an optimized stir squeeze casting technique. The hybrid composites were fabricated using recycled aluminum alloy (AA6061), ceramic particles, and carbon fibers. The optimization of critical process parameters such as stirring speed, casting temperature, and squeeze pressure resulted in composites with superior mechanical and physical properties. Comprehensive testing revealed that the HMMCs exhibited a 20% increase in tensile strength, a 30% improvement in hardness, and a 15% enhancement in impact resistance compared to conventional metal matrix composites (MMCs). Additionally, the composites demonstrated a 10% improvement in thermal conductivity, making them suitable for applications requiring efficient heat dissipation. The successful incorporation of recycled materials not only promoted sustainability but also reduced production costs. The findings underscore the potential of these hybrid composites for high-performance applications in automotive, aerospace, and thermal management industries. Future research should explore the use of other recycled materials and further optimization of casting parameters to enhance composite performance.
Innovative Energy-Efficient Solutions for Sustainable Development in Nigeria's Construction Industry Unegbu, Hyginus Chidiebere Onyekachi; Yawas, Danjuma S.; Dan-asabe, Bashar; Alabi, Abdulmumin Akoredeley
JURNAL MECHANICAL Vol 15, No 2 (2024): JURNAL MECHANICAL
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Lampung

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Abstract

The construction industry in Nigeria, like many developing countries, faces significant challenges and opportunities in adopting energy-efficient technologies. This study provides a comprehensive analysis of the current state of energy-efficient technologies in Nigeria's construction sector, examining adoption rates, perceived barriers, benefits, and recommendations for enhancing energy efficiency. Data were collected from 50 survey respondents and 15 in-depth interviews with key stakeholders, including architects, engineers, policymakers, and construction managers. The findings reveal that solar panels, LED lighting, and energy-efficient HVAC systems are the most commonly adopted technologies. Regression analysis indicates that regulatory support and stakeholder awareness are significant predictors of technology adoption, while financial constraints, regulatory challenges, and a lack of technical expertise are primary barriers. The thematic analysis highlights the interplay between economic incentives, regulatory environments, and cultural attitudes in influencing adoption. Operational cost savings, enhanced environmental sustainability, and improved indoor environmental quality are identified as major benefits of adopting energy-efficient technologies. The study provides several recommendations, including strengthening regulatory frameworks, providing financial incentives, enhancing capacity-building programs, conducting public awareness campaigns, and improving supply chains for green materials. This research contributes to the understanding of sustainable construction practices in Nigeria and offers practical strategies for overcoming barriers to the adoption of energy-efficient technologies. The findings have important implications for policymakers, industry stakeholders, and researchers aiming to promote sustainability in the construction sector.
Assessing the Environmental and Economic Benefits of Solar Energy Integration in Nigerian Construction. Unegbu, Hyginus Chidiebere Onyekachi; Yawas, Danjuma S.; B., Dan-asabe; A.A., Alabi
Journal of Infrastructural in Civil Engineering Vol 6, No 01 (2025): Volume 6, Issue 01, January 2025
Publisher : Universitas Teknokrat Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33365/jice.v6i01.4702

Abstract

This study investigates the environmental and economic benefits of integrating solar energy into the Nigerian construction sector, alongside the challenges and barriers hindering its adoption. Utilizing a mixed methods approach, the research combines quantitative data from surveys and qualitative insights from interviews and case studies. The findings demonstrate substantial reductions in greenhouse gas emissions and pollutants such as sulfur dioxide and nitrogen oxides, highlighting the positive impact of solar energy on air and water quality. Economically, the analysis reveals high Net Present Values (NPV) and Internal Rates of Return (IRR), indicating that solar energy investments are financially viable with significant long-term savings. However, the study identifies key challenges, including financial constraints, technological limitations, regulatory hurdles, and social and cultural barriers. Hierarchical Linear Modeling (HLM) provides a nuanced understanding of the multi-level factors influencing solar energy adoption, emphasizing the importance of individual awareness and organizational policy support. The study contributes to the existing literature on sustainable construction by providing empirical evidence and practical insights for policymakers and industry stakeholders. Recommendations include the development of supportive regulatory frameworks, financial incentives, public awareness campaigns, and community engagement strategies to overcome the identified barriers. Despite its limitations, this study underscores the critical role of solar energy in promoting environmental sustainability and economic development in Nigeria, calling for coordinated efforts to accelerate the transition to renewable energy solutions.
Analyses of Sustainable Water Management Practices in Nigerian Building Projects Unegbu, Hyginus Chidiebere Onyekachi; Yawas, Danjuma S.; B., Dan-asabe; A.A., Alabi
Journal of Infrastructural in Civil Engineering Vol 6, No 01 (2025): Volume 6, Issue 01, January 2025
Publisher : Universitas Teknokrat Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33365/jice.v6i01.4701

Abstract

This study examines sustainable water management practices in Nigerian building projects, focusing on current practices, barriers, enablers, and comparisons with global standards. Data were collected from 272 stakeholders, including architects, engineers, contractors, policymakers, and building occupants. Findings reveal partial adoption of water conservation practices, with significant barriers such as financial constraints, lack of technical expertise, and inadequate regulatory frameworks. Key enablers identified include increasing stakeholder awareness, government incentives, and international cooperation. Cluster and factor analyses highlight patterns and dimensions of water management practices. Case studies from Lagos and Abuja demonstrate the feasibility and benefits of comprehensive water management plans. The study concludes that addressing financial and technical barriers and leveraging enablers is essential for advancing sustainable water management in Nigeria, providing valuable insights for policymakers, industry stakeholders, and researchers.
OPTIMIZING WASTE MANAGEMENT STRATEGIES FOR SUSTAINABLE CONSTRUCTION: ASSESSING THE IMPLEMENTATION OF CIRCULAR ECONOMY PRINCIPLES IN NIGERIA Unegbu, Hyginus Chidiebere Onyekachi; YAWAS, Danjuma S.; Dan-asabe, Bashar; Alabi, Abdulmumin Akoredeley
Jurnal Ilmiah Teknologi dan Rekayasa Vol 29, No 3 (2024)
Publisher : Universitas Gunadarma

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35760/tr.2024.v29i3.12837

Abstract

This study investigates waste management practices in Nigeria’s construction industry, with a focus on evaluating the adoption of circular economy (CE) principles. Using a mixed-methods approach, including structured surveys and semi-structured interviews with key stakeholders, the research highlights significant barriers to CE implementation. The findings reveal that while awareness of CE principles is moderately high, actual adoption remains limited due to financial constraints, weak regulatory enforcement, inadequate technical expertise, and insufficient infrastructure. The industry primarily relies on unsustainable waste disposal methods such as landfilling and open dumping, with limited recycling and material reuse. The study identifies opportunities for improving waste management through government-led financial incentives, regulatory reforms, capacity-building programs, and investment in recycling infrastructure. Furthermore, the adoption of digital tools like Building Information Modeling (BIM) and strategies such as modular construction are highlighted as promising approaches to reducing waste and enhancing resource efficiency. The research concludes with recommendations for a collaborative effort between government, industry, and educational institutions to drive the adoption of CE practices. Implementing these strategies could lead to significant environmental, economic, and social benefits for Nigeria’s construction industry.
INTEGRATING RENEWABLE ENERGY SOLUTIONS IN SUSTAINABLE BUILDING PROJECTS: A CASE STUDY OF NIGERIAN URBAN CENTERS (This article has been retracted due to findings of duplicate publication) Unegbu, Hyginus Chidiebere Onyekachi; YAWAS, Danjuma S.; Dan-asabe, Bashar; Alabi, Abdulmumin Akoredeley
Jurnal Ilmiah Teknologi dan Rekayasa Vol 30, No 1 (2025)
Publisher : Universitas Gunadarma

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35760/tr.2025.v30i1.12836

Abstract

This study explored the integration of renewable energy solutions in sustainable building projects across three major Nigerian urban centers: Lagos, Abuja, and Port Harcourt. The research focused on the viability and impact of solar photovoltaic (PV) systems, wind energy, and biomass waste-to-energy solutions in reducing energy consumption and greenhouse gas (GHG) emissions. Data were collected through interviews, site visits, and simulations using energy performance modelling software. Advanced data analyses, including cost-benefit analysis (CBA), sensitivity analysis, and life cycle assessment (LCA), were conducted to assess financial viability and environmental impact. The results show that solar PV systems are the most effective, providing energy savings of 25% to 35% with a payback period of 6 to 8 years. Biomass waste-to-energy projects demonstrated promise in industrial settings, while wind energy adoption remains limited due to high upfront costs and longer payback periods. The study identifies key barriers to adoption, such as high initial capital costs, lack of technical expertise, and weak policy enforcement. Policy recommendations include increasing financial incentives, improving policy enforcement, building local technical capacity, and fostering public-private partnerships to accelerate renewable energy adoption in Nigeria’s urban centers.
Development of Sustainable Manufacturing Processes for Locally Sourced Materials in Nigeria Unegbu, Hyginus Chidiebere Onyekachi; YAWAS, Danjuma S.; Dan-asabe, Bashar; Alabi, Abdulmumin Akoredeley
JURNAL MECHANICAL Vol 16 No 2 (2025): JURNAL MECHANICAL
Publisher : Fakultas Teknik, Universitas Lampung

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Abstract

This study explores the development and benefits of sustainable manufacturing processes in Nigeria using locally sourced materials, specifically cassava residues, palm kernel shells, and limestone. Driven by the need to reduce dependency on imported resources, this research addresses economic, environmental, and social impacts associated with conventional manufacturing practices. Results indicate that cassava residues and palm kernel shells demonstrate high compressive and tensile strengths, making them viable alternatives to synthetic materials in structural applications. Limestone, optimized through local sourcing and CO₂ capture technology, proved effective in cement production, reducing carbon emissions by up to 15%. Process optimization, including thermal recovery systems, led to an average energy savings of 25%, while emission reductions across processes averaged 20%. Economic analysis highlighted a 22% reduction in total costs, attributed to savings on transportation and energy, underscoring the financial viability of local resource utilization. The environmental and economic advantages demonstrate sustainable manufacturing’s potential to enhance Nigeria’s resilience to global supply chain disruptions, support local job creation, and align with the country’s climate goals. The study recommends policy support through incentives for sustainable practices, investment in recycling and waste processing infrastructure, and training programs to ensure skilled implementation. Future research should expand these processes to other materials and sectors, integrating advanced monitoring technologies for further efficiencies. These findings provide a foundational approach for Nigeria’s shift towards a sustainable, economically resilient manufacturing sector.
Analysing Sustainable Construction Practices in Developing Countries: Success Stories and Challenges Unegbu, Hyginus Chidiebere Onyekachi; Yawas, Danjuma Saleh; Dan-asabe, Bashar; Alabi, Abdulmumin Akoredeley
Journal of Sustainable Construction Vol 5 No 1 (2025): Journal of Sustainable Construction
Publisher : Universitas Katolik Parahyangan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26593/josc.v5i1.8868

Abstract

This study explores the adoption and implementation of sustainable construction practices in developing countries, focusing on key success factors, challenges, and potential solutions. Utilizing a mixed-methods approach, data were collected through surveys, interviews, and field observations, with a response rate of 70%. The findings revealed that while awareness of sustainable construction practices is relatively high (75% of respondents), their implementation remains limited (45% of projects). The major challenges identified include financial constraints (68% of respondents), lack of awareness, inadequate regulatory frameworks, and technical barriers. Critical success factors for sustainable projects include robust government support, effective stakeholder collaboration, access to innovative financing, and comprehensive capacity-building programs. The study contributes to both academic and practical understanding by providing empirical evidence and actionable insights to enhance the adoption of sustainable construction practices. Recommendations for policymakers, construction professionals, and stakeholders include developing comprehensive sustainability policies, providing financial incentives, strengthening regulatory frameworks, promoting public-private partnerships, and investing in continuous capacity building.
OPTIMIZING CIRCULAR ECONOMY PRACTICES IN NIGERIAN CONSTRUCTION: EFFECTIVE STRATEGIES FOR WASTE REDUCTION AND RESOURCE EFFICIENCY Unegbu, Hyginus Chidiebere Onyekachi; Yawas, Danjuma S.; Dan-asabe, Bashar; Alabi, Abdulmumin Akoredeley
JEMIS (Journal of Engineering & Management in Industrial System) Vol. 12 No. 2 (2024)
Publisher : Industrial Engineering Department, Faculty of Engineering, Universitas Brawijaya

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Abstract

This study explores the current state of circular economy (CE) practices in the Nigerian construction industry, identifying key challenges and opportunities for their implementation. Utilizing a mixed-methods approach, data were collected from 200 survey participants and 20 key informants through structured surveys and semi-structured interviews. The quantitative data were analyzed using descriptive and inferential statistics, including regression and factor analysis, to uncover the relationships between variables and the underlying dimensions of barriers to CE adoption. The findings reveal that while there is a moderate level of awareness and implementation of CE practices, such as waste segregation and the use of recycled materials, these practices are not yet widespread. Major barriers identified include lack of awareness, high implementation costs, and insufficient regulatory support. Specifically, 75% of respondents cited lack of awareness as a significant barrier, and 80% identified high costs as a deterrent. Regression analysis indicated that awareness level, regulatory support, and company size positively influence CE practice adoption, while perceived cost has a negative impact. The study also highlights positive perceptions towards CE practices among industry professionals, with 85% of respondents recognizing their importance for the future of the construction industry. Factor analysis revealed three main dimensions of barriers: financial, awareness and education, and regulatory and policy barriers. Based on these findings, the study recommends targeted educational programs to increase awareness, financial incentives to mitigate cost barriers, and stronger regulatory frameworks to enforce sustainable practices.
Development and Characterization of Advanced Recycled Hybrid Metal Matrix Composites via Enhanced Stir Squeeze Casting Method for Industrial Applications Unegbu, Hyginus Chidiebere Onyekachi; Yawas, Danjuma S.
JURNAL MECHANICAL Vol 15 No 2 (2024): JURNAL MECHANICAL
Publisher : Fakultas Teknik, Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/mech.v15i2.5267

Abstract

This study presents the development and characterization of advanced recycled hybrid metal matrix composites (HMMCs) using an optimized stir squeeze casting technique. The hybrid composites were fabricated using recycled aluminum alloy (AA6061), ceramic particles, and carbon fibers. The optimization of critical process parameters such as stirring speed, casting temperature, and squeeze pressure resulted in composites with superior mechanical and physical properties. Comprehensive testing revealed that the HMMCs exhibited a 20% increase in tensile strength, a 30% improvement in hardness, and a 15% enhancement in impact resistance compared to conventional metal matrix composites (MMCs). Additionally, the composites demonstrated a 10% improvement in thermal conductivity, making them suitable for applications requiring efficient heat dissipation. The successful incorporation of recycled materials not only promoted sustainability but also reduced production costs. The findings underscore the potential of these hybrid composites for high-performance applications in automotive, aerospace, and thermal management industries. Future research should explore the use of other recycled materials and further optimization of casting parameters to enhance composite performance.
Co-Authors A.A., Alabi Alabi, Abdulmumin Akoredeley B., Dan-asabe Dan-asabe, Bashar Yawas, Danjuma S. Yawas, Danjuma Saleh