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All Journal Asian Journal of Science, Technology, Engineering, and Art Mikailalsys Journal of Advanced Engineering International
Berry, Ulrich
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Arts Chemical Engineering, Chemistry & Bioengineering Computer Science & IT Electrical & Electronics Engineering Engineering Mechanical Engineering Social Sciences

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RETRACTED: Valorization of Plastic Waste in the Manufacture of Paving Stones in Congo Republic: The Case of Polyethylene Terephthalates (PET) Berry, Ulrich; Nkeletela, Laurette Brigelia; Samba, René Evrard Josué; Motoula, Smäel Magloire Elombo; Mikanou, Olivier Mabiala
Asian Journal of Science, Technology, Engineering, and Art Vol 3 No 5 (2025): Asian Journal of Science, Technology, Engineering, and Art
Publisher : Darul Yasin Al Sys

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58578/ajstea.v3i5.6904

Abstract

This study addresses the challenge of plastic waste, one of the major contributors to environmental pollution by proposing its valorization through recycling for construction applications. Specifically, the research explores the use of waste thermoplastics, with emphasis on polyethylene terephthalate (PET) collected from the streets of Brazzaville, as a binder in the production of paving blocks for road surfacing. The methodology involved incorporating 53.33% recycled plastic into a sand matrix to form paving blocks, with performance evaluation focused on water absorption behavior. The results indicate that the paving blocks exhibit very low water absorption rates, which remain nearly constant despite variations in plastic content. These findings suggest that PET-based recycled composites have favorable properties for road surfacing, demonstrating both environmental and practical benefits. The study highlights the potential of such recycling approaches to reduce plastic pollution while contributing to sustainable infrastructure development.
Valorization of Plastic Waste in the Manufacture of Paving Stones in Congo Republic: The Case of Polyethylene Terephthalates (PET) Berry, Ulrich; Motoula, Smäel Magloire Elombo; Samba, René Evrard Josué; Ndzessou, Westinevy Benarez
Asian Journal of Science, Technology, Engineering, and Art Vol 3 No 4 (2025): Asian Journal of Science, Technology, Engineering, and Art
Publisher : Darul Yasin Al Sys

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58578/ajstea.v3i4.7260

Abstract

This study aims to contribute to the valorization of plastic waste—one of the leading contributors to environmental pollution—by proposing a practical recycling approach that utilizes waste plastics as a binder in road surfacing materials. Specifically, the research investigates the use of thermoplastic waste, with a focus on polyethylene terephthalate (PET), collected from the streets of Brazzaville, in the production of eco-friendly paving blocks. These blocks are composed of a sand matrix and contain 53.33% recycled plastic by weight. The study employed an experimental methodology, with water absorption rate as the primary performance indicator. The results indicate a consistently low water absorption rate across samples, regardless of variations in plastic content, suggesting a stable and durable material performance. These findings highlight the potential of recycled plastic-based paving blocks as a sustainable alternative for road surfacing, contributing to both waste reduction and infrastructure development.
Oil and Renewable Energies: A Review Berry, Ulrich; Levo, Marcelin Phambu; Madimba, John Didrick
Asian Journal of Science, Technology, Engineering, and Art Vol 3 No 6 (2025): Asian Journal of Science, Technology, Engineering, and Art
Publisher : Darul Yasin Al Sys

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58578/ajstea.v3i6.7861

Abstract

Energy plays a critical role in driving the development and sustainability of modern societies, serving as a foundational component in fulfilling essential human needs such as heating, transportation, cooking, and powering industrial and domestic activities. Although renewable energy sources—such as solar, wind, hydro, and biomass—are gaining traction due to their environmental benefits and long-term sustainability, non-renewable sources like oil continue to dominate the global energy system. This study aims to conduct a comparative analysis of renewable energy and oil, examining their respective characteristics, advantages, and limitations. The analysis highlights that while renewable sources are cleaner and replenishable on a human timescale, oil remains a dominant energy source due to its high energy density, ease of storage and transport, and integral role in the global economy. However, the environmental drawbacks and finite nature of oil underscore the urgency of transitioning toward more sustainable alternatives. The findings underscore the necessity of a gradual but deliberate shift toward renewable energy to reduce greenhouse gas emissions, combat climate change, and ensure long-term energy security. This study contributes to the ongoing discourse on sustainable energy transitions and offers insights into the challenges and opportunities associated with reducing global dependence on fossil fuels.
A Study on the Production of Hydrocarbons from Used Thermoplastics in the Republic of Congo Berry, Ulrich; Mabelet, Lagloire Bienvenu
Mikailalsys Journal of Advanced Engineering International Vol 2 No 3 (2025): Mikailalsys Journal of Advanced Engineering International
Publisher : Darul Yasin Al Sys

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58578/mjaei.v2i3.8076

Abstract

End-of-life plastics represent a major hazardous waste stream worldwide, with an estimated 353 million tons of plastic waste generated in 2019 (Global Plastics Outlook, 2019). Their non-biodegradable nature causes significant environmental and health problems, including landscape degradation, proliferation of harmful insects, and fire hazards, with toxic smoke posing serious risks to human health. In the context of high demand for raw materials and the depletion of petroleum resources, the management of these wastes has become a critical environmental challenge, making recycling and energy recovery from plastics an essential component of sustainable development strategies. The aim of this study is to convert these wastes into fuels, thereby providing both economic and ecological benefits. Among the possible processes, pyrolysis is preferred because it decomposes plastics at lower temperatures than incineration or gasification, reducing the risk of metal evaporation and the release of other toxic substances. Therefore, pyrolysis emerges as an effective solution to reduce the volume of used plastics while producing reusable hydrocarbons.
Co-Authors Levo, Marcelin Phambu Mabelet, Lagloire Bienvenu Madimba, John Didrick Mikanou, Olivier Mabiala Motoula, Smäel Magloire Elombo Ndzessou, Westinevy Benarez Nkeletela, Laurette Brigelia Samba, René Evrard Josué