DOI: 10.47481/jscmt.1166150 ISSN: 2458-973X

A Comparative Evaluation of The Mechanical Properties of PET and Polystyrene Modified Asphaltic Concrete Containing Rice Husk Ash Filler.

Desmond EWA, Joseph UKPATA, Anderson ETİKA, Enang EGBE, Alorye IDUKU
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The study evaluated and compared the influence of bitumen binder modification for sustainable asphalt using waste plastic (Polyethylene Terephthalate, PET) and waste Polystyrene (PS) at 5-50% modification levels. Rice husk ash (RHA) and desilted sand were used as filler and fine aggregate with crushed granite as coarse aggregate. Tests conducted include; penetration, viscosity, flash point, fire point, specific gravity, ductility and marshal stability test on asphalt. For PET modified-binder a decrease in penetration and ductility was observed while the specific gravity, viscosity, flash and fire points of the bitumen increased. For the PS modified-binder, the penetration, ductility, viscosity and specific gravity decreased with an increase in PS while the flash and fire point increased. Marshall Stability results showed an optimal of 20% PET modification was adequate for binder course with stability, flow, density, air void, void in mineral aggregates (VMA), and Void filled with bitumen (VFB) of 4875N, 3.53mm, 2.460g/cm3, 3.30%, 18.20%, and 81.87% respectively. 10% PS modification content, the stability, flow, density, air void, void in mineral aggregates (VMA), and Void filled with bitumen (VFB) were found to be 6825N, 3.33mm, 2.362g/cm3, 4.52%, 18.21%, and 75.18% respectively which was found to be adequate for Wearing course. Hence, it was concluded that the investigated waste plastics could be used in Asphalt pavement courses.

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