Soil Stabilization Using Waste Plastic Materials
Open accessAbstract
Expansive clay soils are the types of soils whose volume changes with the change in water content. They have a behavior of swelling and shrinking that is a serious hazard to structures built over them. Expansive soils are abundantly existing soil types in Ethiopia, particularly Addis Ababa. This paper shows the outcomes of an attempt to reinforce and stabilize expansive clay soil with plastic bottle strips. The plastic strips were prepared and added at three different mixing ratios (0.5%, 1% and 2%) by weight and in three different aspect ratios (5 mm × 7.5 mm, 10 mm × 15 mm, 15 mm × 20 mm). The experimental results showed that there was a significant improvement in shear strength parameters. The swelling and desiccation cracking behavior of the soil were also expressively reduced. There was a substantial reduction in the optimum moisture content and slight increment in maximum dry density. The optimum plastic size (aspect ratio) and plastic content that results in optimum result can be selected based on the importance of the selection parameter for a specified engineering work. Stabilizing expansive clay soils with waste plastic bottles simultaneously solves the challenges of improper plastic waste recycling that is currently a teething problem in most developing countries. The results obtained from this study favorably suggest that inclusion of this material in expansive soils would be effective for ground improvement in geotechnical engineering.
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PET bottles shredded or cut into small pieces can be integrated into expansive clay soil to enhance its structure and stability.
“When shredded or cut into small pieces, PET can be integrated into expansive clay soil to enhance its structure and stability.”
From Transforming Plastic Waste into Value: A Review of Management Strategies and Innovative Applications in Sustainable Construction (2025) · cites this paper as [56]
Integrating shredded PET into expansive clay soil improves the soil's load-bearing capacity, making it valuable in the construction industry.
“This process improves the soil’s load-bearing capacity, making it particularly valuable in the construction industry, which has significant material consumption needs [56].”
From Transforming Plastic Waste into Value: A Review of Management Strategies and Innovative Applications in Sustainable Construction (2025) · cites this paper as [56]
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- Authors
- Kassa, R. B., Workie, T., Abdela, A., Fekade, M., Saleh, M., & Dejene, Y.
- Affiliations
- Pan African University Institute for Basic Sciences, Technology and Innovation (KE)
- Addis Ababa University (ET)
- Corresponding author
- Kassa, Rebecca Belay
- ORCID
- Kassa, Rebecca Belay
- Venue
- Open Journal of Civil Engineering
- Publisher
- Scientific Research Publishing, Inc.
- Published
- 2020
- Volume
- 10
- Issue
- 01
- Pages
- 55-68
- ISSN
- 2164-3164 (ISSN-L)
- 2164-3172
- OpenAlex
- W3011583467
- Cited by
- 62
- References
- 5
- Citations by year
- 2026: 3 · 2025: 11 · 2024: 20 · 2023: 13 · 2022: 7 · 2021: 5 · 2020: 3
- FWCI
- 4.09
- Type
- journal article
- Language
- en
- Open access
- diamond
- doi.org
- Locations
- Open Journal of Civil Engineering (publishedVersion, cc-by)
- Topics
- Physical Sciences › Engineering › Civil and Structural Engineering › Geotechnical Engineering and Soil Stabilization
- Physical Sciences › Engineering › Civil and Structural Engineering › Geotechnical and construction materials studies
- Physical Sciences › Engineering › Civil and Structural Engineering › Soil and Unsaturated Flow
- Keywords
- soil stabilization, expansive soil, plastic bottle waste, plastic recycling, shear strength, optimum moisture content, maximum dry density, soil improvement, Addis Ababa
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