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.Keywords: Lateritic soil, High density polyethylene (HDPE) waste, Pavement thickness, Sub-grade soil
Highlights
The need for adequate provision of transportation facilities is enormously increasing with increase in population and the need for maintenance of the existing ones
Procedure: The following experiments were performed on the lateritic soil: particle size distribution in accordance with B.S 1377:1990 Part 2:9; Atterberg’s limit test in accordance with B.S. 1377:1990, part 2:4,2:5 and 2:6; specific gravity test in accordance with B.S. 1377:1990, part 2:8; moisture content test in accordance with B.S. 1377:1990, part 2:3; compaction test in accordance with B.S. 1377:1990, part 4:4 and California bearing Ratio (CBR): B.S. 1377:1990, part 4:7
The compaction process for the lateritic soil-high density polyethylene (HDPE) waste mixture is as shown in Plate 3
Summary
The need for adequate provision of transportation facilities is enormously increasing with increase in population and the need for maintenance of the existing ones. Highway engineers are faced with the problems of providing very suitable materials for the highway construction. Predicated on this fact, continuous researches are being carried out by individuals, firms and institutions on ways to improve the engineering properties of soils. The ability to blend the naturally abundant lateritic soil with some appropriate additives to give it better engineering properties in both strength and waterproofing characteristics has been of great importance to the Transportation engineers (Gidigasu, 1976). In bid to improve the engineering properties of soil to make it suitable for road construction, several researches on soil stabilization have been carried out. This research work, was undertaken to investigate soil improvement using Shredded high density polyethylene (HDPE) Waste. It was reported that 30 % of the domestic waste in a typical Nigerian city
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