Performance of waste cooking oil-based asphalt rejuvenators based on orthogonal design
This study focused on designing and regulating the properties of asphalt rejuvenators by separating components and performing multi-component composite modification of waste cooking oil,aiming to address challenges such as the instability of waste cooking oil sources and quality.The waste cooking oil was first filtered and distilled using equivalent molecular weight classification technology to obtain three different components with different equivalent molecular weights.Plasticizers,viscosity-increasing resins,and anti-aging agents were then added to prepare a waste cooking oil component-based asphalt regeneration agent.An orthogonal experiment was used to determine the optimal material ratio for the regeneration agent at different viscosity levels.A comprehensive analysis of the thermal stability and microstructural performance of the rejuvenator,as well as the rheological properties of the rejuvenated asphalt,reveals that the equivalent molecular weight grade was the primary factor influencing the activation energy of the rejuvenator.The thermal stability of the rejuvenator increased with the increase in equivalent molecular weight.The infrared characteristic peak positions of the rejuvenators were consistent,there were differences in peak intensities.The aromatic fraction characteristic peak areas of the light and medium fraction rejuvenators were twice as large as those of the heavy fraction rejuvenators.Under the optimal mass fraction,the complex modulus of reclaimed asphalt was greater than that of base asphalt,while the phase angle was smaller than that of base asphalt,which indicated that the rheological properties of reclaimed asphalt were superior to those of base asphalt.The low-temperature continuous grading temperature of the rejuvenated asphalt was lower than that of the base asphalt,and the low-temperature fractionation temperature increased with the equivalent molecular weight of the components of waste cooking oil.
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