EFFECT OF PLASTIC WASTE ON THE STRENGTH CHARACTERISTIC OF NIGERIAN LATERITIC SOIL USED AS SUB BASE MATERIAL IN ROAD CONSTRUCTION: A SYSTEMATIC REVIEW APPROACH

Civil engineering

There is increasing need for transportation facilities due to population growth and the maintenance of existing infrastructure. However, the soil properties are improved using soil stabilization techniques using geogrids, fibre, or waste plastic to improve subgrade strength. The paper aims to review the history, benefits, applications, and potential issues of using plastic waste for soil reinforcement. The addition of plastic waste has increase the dry density of lateritic soil and reduces its water absorption capacity. Plastic waste also enhances the load-bearing capacity of the soil, as indicated by the CBR value. The review suggests that 5% plastic waste content is the optimum dosage for improving the CBR value. Stabilization with plastic waste and other agents can enhance the strength of the sub-base material for road construction. However, it also indicates the potential leaching of chemical components from the plastic waste into the environment, which negatively impact ecosystems, water quality, and human health.

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