Browsing by Author "Ezemenike, Stanley Chukwu"

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    Effect of Polythylene Terephthal(PET) on the Properties of Asphaltic Concrete.
    (Obafemi Awolowo University, 2016) Ezemenike, Stanley Chukwu
    The study characterized the asphalt binder and polyethylene terephthalate (PET); assessed the effect of varying content of polyethylene terephthalate in asphaltic concrete and determined the optimum percentage of PET in the asphaltic concrete capable of resisting permanent deformation. The polyethylene terephthalate was shredded into sizes between 0.6 mm to 2.36 mm with a shredding machine while physical and chemical properties of asphalt binder (bitumen) were determined to characterize them. The penetration, softening point and flash point tests were carried out on the bitumen that contained varying amount of polyethylene terephthalate. Asphaltic concrete samples were prepared using polyethylene terephthalate at 0, 2, 4, 6, 8, 10 and 12% by weight of the bitumen. The samples were subjected to marshal stability test. The values of stability, flow, density, air void (AV), void in mineral aggregate (VMA) and voids in filled with bitumen (VFB) were obtained and the effect of polyethylene terephthalate on asphaltic concrete was assessed with a view to determine the optimum percentage of polyethylene terephthalate in the asphaltic concrete. The results showed that penetration values for bitumen-PET mixture at 0, 2, 4, 6, 8, 10 and 12 % were 63.63, 58.17, 52.07, 47.07, 39.06, 30.67 and 23.77 d-mm, while their corresponding softening point values were 47, 47.7, 48.4, 49.75, 50.55, 51.35 and 51.75 ̊ C and flash point values of 264, 269, 272, 280, 284, 290 and 297 ̊ C respectively. The Marshal test results for the same proportions gave stability values of 10.42, 10.84, 11.71, 14.29, 14.81, 13.12, and 10.92 kN, flow values of 3.85, 3.60, 3.38, 2.85, 2.61, 3.27 and 3.48mm, bulk density values of 2.39, 2.37, 2.32, 2.29.2.27, 2.27 and 2.25 g/m3 , air void (AV) values of 4.47, 4.04, 3.933, 3.78, 3.404, 3.017 and 2.85 %, void in mineral aggregate (VMA) values of 18.28, 17.84, 17.44, 17.12, 16.62, 16.12 and 16.54 ̊ C, and void filled with bitumen values of 75.83, 77.35,77.48, 77.92, 79.52, 81.28 and 82.71% respectively. The results showed` that an optimum proportion in the asphaltic concrete was achieved at 8% composition of polyethylene terephthalate. The study concluded that the polyethylene terephthalate as additive to the bitumen improved the properties of the asphaltic concrete produced.