Abstract
This research explores the effects of using waste engine oil bottom on physical, rheological properties and composite modification mechanism of SBS-modified asphalt. The SBS asphalt binder was modified by WEOB with different concentrations (2, 4, and 6 wt%). The GC-MS and FTIR spectrometry were conducted to evaluate the chemical compositions of WEOB- and WEOB-modified asphalt. RV, DSR, and BBR were tested to evaluate high- and low-temperature pavement performance. Fluorescence microscope (FM) test, bar thin layer chromatograph (BTLC) test, and AFM test were performed to evaluate the micromorphologies and modification mechanism. The test results showed that a new characteristic peak appeared in the infrared spectrum of the WEOB-modified SBS asphalt, indicating a chemical reaction in the modification process. Incorporation of WEOB improves both the high-temperature and low-temperature properties of the SBS asphalt binder. It was confirmed that with the increase of WEOB concentration, the content of colloid gradually increases, which promotes the swelling and compaction of SBS polymer network structure. Furthermore, WEOB promotes the polarity of SBS and forms graft product MAH-g-SBS with asphalt, thus inhibiting the thermal movement of asphalt molecules. On the contrary, light components have a good correlation with the surface roughness of modified asphalt; the results show that the modified asphalt has good rutting resistance.
Highlights
Materials and MethodsWEOB used was purchased from local Motor Madness
A new survey shows that America can generate millions of gallons of WEOB annually [6]. e engine oil and asphalt belong to different products in the process of petroleum refining and have homology, which has been confirmed in previous studies [8]
Based on the above results and discussion, the following conclusions can be drawn: (1) WEOB is mainly composed of small molecular compounds similar to the asphalt composition, such as cycloalkanes, linear alkanes, various anhydrides, and their derivatives, which favored their physical miscibility between WEOB and asphalt
Summary
WEOB used was purchased from local Motor Madness It was a byproduct of refining waste engine oil through vacuum distillation, centrifugal separation, and other processes. Tests were performed at −12°C and −18°C. e gas chromatograph (GC-MS) was conducted to evaluate the chemical component of WEOB. E potential chemical reaction of WEOB- and SBS-modified asphalt was obtained by FTIR (NICOLET 6700 TM). In view of the different fluorescence effects of asphalt and SBS polymer, the swelling property of the WEOB-modified asphalt were evaluated by FM (MIKON, USA) images. E test method adopts tapping mode and the resonance frequency of 260 KHz. e content of four components (asphaltene, resin, aromatic hydrocarbon, and saturated hydrocarbons) of asphalt will change during the modification process.
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