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Journal of Applied Sciences and Environmental Management
World Bank assisted National Agricultural Research Project (NARP) - University of Port Harcourt
ISSN: 1119-8362
Vol. 20, No. 3, 2016, pp. 660-666
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Bioline Code: ja16078
Full paper language: English
Document type: Research Article
Document available free of charge
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Journal of Applied Sciences and Environmental Management, Vol. 20, No. 3, 2016, pp. 660-666
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Improvement of Strength Characteristics of Lateritic Sub-Grade Soil with Shredded Polyethylene Waste
OJURI, O.O.
Abstract
This paper presents the results of investigation of the behavior of pavement subgrade
soil stabilized with shredded polyethylene waste. Shredded high density polyethylene
High Density Polyethylene Waste of maximum size 20 × 25mm was used for the improvement
of lateritic soil at various percentages which are; 1%, 2%, 3%, 4%, and 5% respectively. Series
of laboratory tests such as, Compaction and California Bearing Ratio (CBR) were conducted to
determine the influence of polyethylene waste on the lateritic soil. The results reveal that
addition of polyethylene waste to the soil increased the optimum moisture content (OMC) but,
reduced the maximum dry density (MDD) from 2338.60kg/m3 to 1941.64kg/m3. A decrease in
the dry density of soil sample shows that low comparative energy would be required for the soil
to attain its maximum dry density; as a result the cost of compaction is significantly reduced.
Improvement in CBR values was also observed for laterite-polyethylene mixture; resulting in
maximum CBR value of 13.18% under soaked condition. This value falls within the range of
10% to 25% CBR value specified for sub grade soils by the AASHTO standard and the
Nigerian Highway Design Manual, Federal Ministry of Works and Housing. An increase in the
California Bearing Ratio value can significantly reduce the total thickness of the pavement;
hence, the total cost involved in the project. The strength of Lateritic clay subgrade soils can be
improved with the addition of five percent (5%) Shredded high density polyethylene (HDPE)
Waste of maximum size 20 × 25mm. © JASEM
Keywords
Lateritic soil; High density polyethylene (HDPE) waste; Pavement thickness; Sub-grade soil
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© Copyright 2016 - Journal of Applied Sciences and Environmental Management
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