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All Journal Asian Journal of Science, Technology, Engineering, and Art
Samba, René Evrard Josué
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Arts Computer Science & IT 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.
Valorisation of Waste Tires by Pyrolysis in the Republic of Congo Berry, Ulrich; Motoula, Smael Magloire Elombo; Samba, Réné Evrard Josué
Asian Journal of Science, Technology, Engineering, and Art Vol 4 No 1 (2026): 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.v4i1.8699

Abstract

The pyrolysis of waste tires represents an effective strategy for simultaneous energy recovery and waste reduction, yet further empirical characterization of the resulting pyrolytic oil is needed to assess its suitability as an alternative fuel. This study aims to obtain pyrolytic oil from end-of-life tires and analyze its main physical characteristics to evaluate its potential for energy applications. The oil produced by pyrolysis exhibits a density of 769.4 kg/m³, a specific gravity of 0.7694, a low kinematic viscosity of 1.5 cSt, and a slightly acidic pH of 4, values that are consistent with those reported in the literature. These characteristics indicate a high proportion of light hydrocarbons, suggesting that the oil is suitable for use as a fuel or as a fuel additive. Observed variations compared with other studies highlight the influence of tire composition and pyrolysis conditions on the quality and properties of the obtained oil, underlining the importance of process optimization. Overall, the findings confirm that tire pyrolysis is a promising method for energy recovery from waste tires, providing a sustainable pathway for hydrocarbon production while contributing to improved solid waste management and resource valorization.
Co-Authors Berry, Ulrich Mikanou, Olivier Mabiala Motoula, Smäel Magloire Elombo Ndzessou, Westinevy Benarez Nkeletela, Laurette Brigelia