Evaluation of Waste Engine Oil‐Rejuvenated Asphalt Concrete Mixtures with High RAP Content

Abstract

The use of large proportions of reclaimed asphalt pavement is necessary to meet the increasing demand for road construction materials in a sustainable way. One of the challenges of using a greater percentage of reclaimed asphalt pavement (>30%) is the greater stiffness of mixes incorporating it. While this stiffness problem is usually resolved by using different commercial rejuvenators, there are circumstances in which commercial rejuvenators are not available. Therefore, this study evaluates the potential of using waste engine oil as a substitute for commercial rejuvenators for the higher percentage of reclaimed asphalt pavement that could meet the increasing demand in a more sustainable way. To assess the possibility of using a higher percentage of reclaimed asphalt pavement in road construction, different percentages of reclaimed asphalt pavement (30%, 40%, and 50%) are used. Following the property of the aged binder, three different percentages (7%, 13%, and 20%) of waste engine oil are considered. Each percent of waste engine oil is incorporated with one of the three mixes. The mixes (with the minimum required Marshall criteria) are evaluated for different properties, namely, their indirect tensile strength, resilient modulus, and durability. Finally, those properties are compared to those of the mixes rejuvenated by commercial rejuvenators. It is observed that, for the aforementioned properties, 7% to 13% of waste engine oil is identical to the commercial rejuvenator for the mixes with 30% to 40% of reclaimed asphalt pavement.

Towards the Use of Waste Pig Fat as a Novel Potential Bio-Based Rejuvenator for Recycled Asphalt Pavement

“…Empirical binder tests including softening point, needle penetration, and dynamic viscosity revealed the great potentiality of rejuvenators to effectively decrease the viscosity and stiffness of RAP binder in question, thereby enhancing its low-temperature cracking resistance and improving its workability during construction [12]. Different types and dosages of rejuvenating agents-such as aromatic extract [13], waste engine oil [14], and refined tall oil [13]-can be adopted to reach the optimal correlation with the amount and type of RAP binder. The majority of current rejuvenators are petroleum-based products and suffer from increasing demand and correspondingly cost, while supplies are shrinking.…”

Influence of Waste Engine Oil Addition on the Properties of Zeolite-Foamed Asphalt

“…Rejuvenating agents, which restore the chemical structure of aged asphalt by providing lost aromatic constituents and reducing the overall viscosity of the binder, are used for improving the properties of mix asphalt with RAP [15,16]. One of the potential municipal waste materials that can be used to rejuvenate RAP is waste engine oil (WEO) from cars [17,18,19]. The structure of WEO resembles the molecular structures of asphalt with sufficient aromatic content, which leads to coherent bonding by altering the constituents and rejuvenating the aged asphalt [20,21].…”

“…Bio-oil has a similar structure and it can be also successfully used as a rejuvenating agent in mix asphalt [22,23,24]. According to the latest research WEO allows not only to increase the amount of RAP addition in newly designed mixes [25], but also adjusts their properties such as: Fatigue resistance [26], workability [27], indirect tensile strength and moisture susceptibility [17] as well as reduces ductile performance [28]. Waste engine oil may also partially replace virgin asphalt binder.…”

Comparative Evaluation of Waste Cooking Oil and Waste Engine Oil Rejuvenated Asphalt Concrete Mixtures

“…The RAP incorporated mixtures comprised of three distinct levels of RAP (30%, 40%, and 50%). Here, 50% percent of RAP is selected as a maximum considering industrial limit [25]. Mixture with a certain percentage of RAP comprises three different levels of each waste oil (L1, L2, and L3).…”