Abstract
Waste engine oil bottom (WEOB) is a hazardous waste whose effect as an additive to CR+SBS modified asphalt is rarely studied. In this study, the CR+SBS asphalt binder was modified with WEOB in different concentrations (3, 6, and 9 wt%). The GC–MS and FTIR were performed to evaluate the chemical compositions of WEOB and WEOBCR+SBS asphalt. The results showed that the main constituents of WEOB were similar to the functional groups of asphalt, along with maleic anhydride (MAH). Pavement performance-related rheological tests such as RV, temperature sweep (TS), FS, MSCR, and BBR were carried out. Results show that WEOBCR+SBS-6 exhibited the best high- and low-temperature property, followed by CR+SBS-3 and CR+SBS-9. Fluorescence microscope (FM) test, bar thin layer chromatograph (BTLC) test, FTIR, and AFM tests were carried out to evaluate the micro-morphologies and modification mechanism. The analysis revealed increased trends in resin fraction as opposed to asphaltene fraction with the increase of WEOB content. FTIR analysis revealed that the amide groups in WEOBCR+SBS asphalt bonded to the free radicals of CR. Moreover, a modification mechanism was elaborated. WEOB strengthens the cross-linked structure of CR+SBS polymers, reacting with SBS to graft onto MAH-g-SBS, and the free radical of CR interacts with the amide group in WEOB to form a bond. In addition, the content of lightweight components and surface roughness of SBS specimens were in good correlation, which contributed to the rutting resistance and adhesion and self-healing performance.
Highlights
The large-scale construction of highway pavement is accompanied by a large consumption of asphalt, which is a nonrenewable material [1]
It is obvious to see that Waste engine oil bottom (WEOB) mainly comprises maleic anhydride, aromatic rings and linear alkanes, which belong to light molecular weight compounds with the molar mass less than 400 g/mol, and wherein the main compounds of WEOB are aromatic solvents and polyolefin oil, which resembles the light weighted compounds of asphalt and may affect asphalt properties
This study investigated the effect of WEOB on the chemical compounds and rheological properties of WEOB-modified CR+SBS asphalt binders, and elucidated the modification mechanism
Summary
The large-scale construction of highway pavement is accompanied by a large consumption of asphalt, which is a nonrenewable material [1]. Seeking a modifier or extenders to reduce the dependence on petroleum asphalt is desirable. As a potential substitute for modifier, waste materials could be partially or fully used in asphalt binders without compromising pavement performance; this way of disposing of waste can reduce environmental pollution [2,3]. With millions of people around the world owning and driving cars, waste engine oil (WEO) is inevitable. The waste oil will cause irreparable damage to the environment, which is why it is imperative to collect for reuse or recycling [4].
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