Abstract
In order to solve the problems caused by asphalt diseases and prolong the life cycle of asphalt pavement, many studies on the properties of modified asphalt have been conducted, especially polyurethane (PU) modified asphalt. This study is to replace part of the styrene-butadiene-styrene (SBS) modifier with waste polyurethane (WP), for preparing WP/SBS composite modified asphalt, as well as exploring its properties and microstructure. On this basis, this paper studied the basic performance of WP/SBS composite modified asphalt with a conventional performance test, to analyze the high- and low-temperature rheological properties, permanent deformation resistance and storage stability of WP/SBS composite modified asphalt by dynamic shear rheometer (DSR) and bending beam rheometer (BBR) tests. The microstructure of WP/SBS composite modified asphalt was also observed by fluorescence microscope (FM) and Fourier transform infrared spectroscopy (FTIR), as well as the reaction between WP and asphalt. According to the results of this study, WP can replace SBS as a modifier to prepare WP/SBS composite modified asphalt with good low-temperature resistance, whose high-temperature performance will be lower than that of SBS modified asphalt. After comprehensive consideration, 4% SBS content and 15% WPU content (4 S/15 W) are determined as the suitable types of WPU/SBS composite modified asphalt.
Highlights
The effects of SBS and WPU contents on conventional properties of composite modified asphalts are shown in Figures 2 and 3
The conventional properties of WPU/SBS composite modified asphalt are shown in SBS modifier contributes to improving the high- and low-temperature performance of SBS
Compared with SBS modified asphalt, Jnrnr value was lower in WPU/SBS composite modified asphalt, with increasing Jnr-diff nr-diff value as WPU content increases, which shows that WPU/SBS composite modified asphalt has better high-temperature deformation resistance and lower dependence on shear stress, which is more suitable for the construction of pavements under high temperature, heavy load or long steep slope
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. In order to solve the above diseases effectively, research on modified asphalt is of great significance in improving the performance and prolonging the life cycle of asphalt pavement. In the research on asphalt modification, SBS modified asphalt has been studied most, mainly because adding SBS can effectively improve the high-temperature rutting resistance and low-temperature cracking resistance of asphalt, and effectively prolong the life cycle of asphalt pavement [6]. Some researchers have studied the application of PU in asphalt, but studies on WPU in asphalt are still rare [9] Among them, He et al [10] optimized the preparation of PU modified asphalt, and discussed the influence of PU content on the properties of PU modified asphalt, indicating that the performance of modified asphalt can be improved with the increase of PU content, but that the content should not exceed 25%. The microstructure changes of WPU/SBS composite modified asphalt were investigated by a fluorescence microscope (FM) test and Fourier transform infrared spectroscopy (FTIR) test
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