Reuse of Waste Plastic as an Additive in Asphalt Concrete

Abdulazeez Rotimi

Abstract


Plastics are used extensively by people in their everyday life and thus causes environmental pollution when disposed of improperly. Consequently, there is a rising global concern towards waste plastic (WP) management either through recycling or proper waste disposal. However, this study focusses on utilizing waste plastics as an additive for road construction thereby minimizing the environmental hazards caused by improper waste plastic disposal. An investigation of stability of asphalt pavement was made using polythene as an additive to enhance its stability. In the course of this study, Marshall Stability test was performed on five samples (Samples A-E) with a view to determining the proportion of WP required to achieve a stable bituminous mixture. Each sample was characterized by percentage replacement of bitumen with waste plastic (WP) which varied from 0% to 4%. Results from experimentation revealed that high stability of bituminous mixture was attained at 1% replacement of bitumen with WP (i.e. for Sample B). Also, it was observed that at 1% WP replacement, flow values reduced. Nevertheless, this reduction in flow values was attributed to many voids between the mineral aggregates. More so, it was established that Sample E which was characterized by 1% bitumen and 5% WP showed poor stability. The poor performance of Sample E was ascribed to insufficient binding modifier.


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References


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