Abstract
Numerous environmental pollution and resource waste problems are associated with recycled engine oil bottom (REOB), which cannot be effectively recycled. Based on the similarity compatibility theory and component adjustment theory, comparing the physical and rheological properties of laboratory-aged asphalt under three types of REOB (defined as REOB-1, REOB-2, and REOB-3) with different dosages, the optimum type and dosage of REOB as asphalt regenerant were explored. The rejuvenation mechanism of REOB on aged asphalt was revealed by combined performance, four-component, and infrared spectroscopy analyses. The relationship between the four components and physical rheological indexes in the process of asphalt rejuvenated by REOB was quantitatively obtained by the grey relationship analysis. The results show that only REOB-3 with a dosage of 7% on the aged asphalt has the best comprehensive rejuvenation effect. Also, the high-temperature rutting resistance of rejuvenated asphalt with 7% REOB-3 is better than that of the original asphalt, but the low-temperature flexibility and the crack resistance performance have yet to be improved. The mechanism through which REOB rejuvenates aged asphalt is an incomplete component adjustment; some of the components undergo physical or chemical reactions and transformations. Accordingly, the asphaltene content and the intensity of sulfoxide functional groups in aged asphalt decrease, thereby achieving rejuvenation gradually with the addition of REOB. A grey relationship analysis demonstrates that asphaltenes have the greatest influence on high-temperature performance and that low-temperature performance requires a reasonable combination of four components. Moreover, a comprehensive advantage analysis reveals that REOB is the most sensitive to the softening point and that the asphaltene content has the greatest influence on the physical and rheological properties of REOB-rejuvenated asphalt. Therefore, the asphaltene content should be strictly controlled during the addition of REOB to rejuvenate aged asphalt.
Highlights
Oxidation, product wear, pollutant mixing, additive consumption, and water absorption all occur throughout the use of engine oil, leading to the decline in the functionality of the oil; these processes invalidate the production of recycled engine oil (REO)
Villanueva et al [4] used different REO contents to soften asphalt and found that the addition of REO increases the penetration of asphalt, decreases the softening point, and reduces the high-temperature performance of asphalt after softening and significantly improves the low-temperature performance. rough a rheological test on Trinidad Lake Asphalt mixed with different amounts of REO, Ackbarali and Maharaj [5] proved that REO can be used as a modifier to soften hard asphalt
Dedene [6] used REO to modify reclaimed asphalt binders and carried out rutting tests and tensile strength ratio tests on the corresponding asphalt mixture; the results showed that REO can be used as a rejuvenating agent to chemically restore the properties of asphalt pavements containing reclaimed asphalt pavements
Summary
Product wear, pollutant mixing, additive consumption, and water absorption all occur throughout the use of engine oil, leading to the decline in the functionality of the oil; these processes invalidate the production of recycled engine oil (REO). Various functional additives in engine oil containing sulfur, calcium, zinc, phosphorous, and Advances in Materials Science and Engineering molybdenum in addition to oxidation products and metals (including mainly iron and copper) that become worn during engine operation all remain in REOB after these regeneration processes; REOB cannot be effectively utilized. An effective method for utilizing the REOB that remains after the regeneration of REO has yet to be developed, and it will be more necessary to develop application prospects for REOB by conducting research on the use of REOB in asphalt materials. Erefore, it is necessary to carry out systematic studies on several types of REOB used for aged asphalt, because the application of REOB to the rejuvenation of aged asphalt can broaden the effective utilization of REOB and have great economic and engineering significance for reclaimed asphalt pavement (RAP). To explore the feasibility of utilizing REOB for rejuvenating asphalt, this study provides a basis for further research into the application of waste oil to rejuvenate asphalt binders
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