Abstract
In order to explore the applicability of waste engine oil and waste cooking oil used in aged asphalt, the effect of waste engine oil and waste cooking oil on aged asphalt recycling was studied through the analysis of the improvement of its physical, chemical, and rheological properties. Six aged asphalt binders with different aging times were obtained by indoor test simulation using the Thin Film Oven Test at 163 °C. Then, waste engine oil and waste cooking oil with five different dosages were added to investigate improvement performances. The results clearly demonstrated that waste engine oil and waste cooking oil could soften and recover the work ability of aged asphalt effectively. Furthermore, the physical, chemical, and rheological performances of six aged asphalts could be improved to normal level of virgin asphalt if the content of waste engine oil or waste cooking oil was suitable. The rheological properties of aged asphalt with waste cooking oil had better improvement than that with waste engine oil. Overall, the good applicability would provide waste oil a much wider service range in asphalt pavement recycling field. It also provided a method of developing new rejuvenating agent with the two waste oils to achieve complex synergism effect. Moreover, it realized the waste cyclic utilization and environmental protection.
Highlights
Recent societal and economic developments have resulted in an annual increase in the total mileage of highways in China
It can be clearly observed that the penetration values of all aged asphalts had a similar trend whether it was waste engine oil (WEO) or waste cooking oil (WCO) that was added, as all the aged asphalts were softened with increased WEO or WCO dosages
This proved that WEO could soften aged asphalt
Summary
Less than 10 years after construction or operation, many asphalt pavements required different degrees of maintenance due to the different damages sustained during their service lives. This in turn led to the generation of large quantities of reclaimed asphalt pavement materials [1]. Asphalt pavement maintenance was facing the problems of disposal of waste asphalt concrete. The continued use of nonrenewable sources caused environmental pollution as a result of improper waste disposal [2,3]. The recycling technology of waste asphalt pavement is becoming more and more attractive from the perspective of energy and environmental protection in the world [4,5]
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