FTIR Analysis for Ageing of HDPE Pyro-oil Modified Bitumen

Abstract

AbstractAll over the world, the production of plastic is increasing over the years due to its various applications in different sectors. As the demand for plastic is increasing day by day, it consequently results in accumulation of plastic waste. Till the time various elastomer, plastomer, and rubber are used to modify binder. Here an attempt was made to modify bitumen with plastic oil also known as pyro-oil and to check ageing properties of the same. The rheological and chemical behavior of bitumen and modified bitumen is complex due to its unpredictable nature. In this investigation, bitumen was modified with pyro-oil from High-Density Polyethylene (HDPE). Pyro-oil was obtained by pyrolysis of HDPE at about 750 °C. Pyro-oil modified bitumen (PRMB) was prepared by addition of 5, 10, and 15% of HDPE pyro-oil by total weight of bitumen binder mixed at 3000 rpm for about 120 min. The oxidation process of PRMB was studied by using Fourier transform infrared spectroscopy (FTIR). The effect of short-term ageing for VG30, PRMB was studied by SuperPave test protocol and normal oven ageing. The effect of long-term ageing was studied by normal oven ageing. The FTIR results of SuperPave and normal oven aged samples were compared and change in functional group was recorded. Bitumen binders (VG30, PRMB) subjected to ageing and changes in chemical composition were analyzed using FTIR spectroscopy. FTIR results were used to validate chemical bond like C=O and S=O which leads to changes in viscosity and stiffness of binder. It was observed that ageing influences the bitumen chemistry.KeywordsPyro-oilFTIRVG30PRMBHDPE