Abstract
High demand for asphalt binders in road construction verifies the need of finding alternative materials through asphalt pavement recycling. This paper investigated the impact of different rejuvenators on the performance of an aged asphalt binder. Virgin Olive oil, virgin cooking oil, waste cooking oil, virgin engine oil, and waste engine oil were added to a 30/40 penetration grade aged asphalt binder at a fixed oil content of 4% for all types. The wet method was used to blend the rejuvenators and aged asphalt binder. The physical, rheological, and chemical properties of the rejuvenated asphalt binder were evaluated using several laboratory tests which include penetration, softening point, bleeding, loss on heating, storage stability, penetration index, ductility, viscosity, dynamic shear rheometer, and Fourier transform infrared spectroscopy. The outcomes of the physical properties showed that the olive, waste, and virgin cooking rejuvenators can restore the aged asphalt binder to a penetration grade of 60/70. In contrast, the virgin and waste engine oil required a more quantity of oil to rejuvenate the aged asphalt binder. A sufficient amount of rejuvenator could regenerate the (G*/sin δ), (δ°), and (G*) for the aged asphalt binder. The addition of virgin olive and cooking oils in aged asphalt led to a rutting issue. No chemical reactions were observed with the addition of rejuvenators but they give an impact on reducing the oxidation level of the aged asphalt binder. As a result, further research should be performed on waste cooking oil given that it is inexpensive and provides excellent performance results. Doi: 10.28991/cej-2021-03091669 Full Text: PDF
Highlights
Asphalt binder is a primary material used as a binder for the construction of road
The aim of this study is to evaluate the effects of different types of oils on aged asphalt binders, which is essential in asphalt pavement recycling in order to find the best rejuvenator for energy saving and to reduce the environmental impact
The waste and virgin engine oils require a higher amount of oil, greater than 4%, to restore the properties of the 30/40 aged asphalt
Summary
Asphalt binder is a primary material used as a binder for the construction of road. The demand for asphalt binder is high due to the increase in the infrastructure development and construction work [1]. Reclaimed asphalt pavements (RAP) is a by-product of the milling process of pavement surface. RAP can be recycled for the construction of dams, fills, [2, 3], or gravel roads. RAP is recycled into the road pavement as a base or surface material given its cost-effectiveness, environmentally friendly attribute, and good performance [4]. There are various factors that influence the performance of the recycled mixture, such as the amount of RAP, the type of binder, aging process [6, 7], and the addition of a rejuvenator [8]. By applying various types of waste oils in aged asphalt, it will provide a significant effect on the asphalt pavement properties [9]. Using waste cooking oil (WCO) is a smart solution to producing sustainable road asphalt pavement, and it can positively affect the safety, aging, and pavement characteristics of aged asphalt [10, 11]
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