Journal
POLYMERS
Volume 13, Issue 14, Pages -Publisher
MDPI
DOI: 10.3390/polym13142249
Keywords
asphalt pavement; waste polyurethane; modified asphalt; dynamic rheology; micro-characteristics
Categories
Funding
- Fundamental Research Funds for the Central Universities [B210202040]
- National Natural Science Foundation of China [51708177]
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The study focused on replacing part of the SBS modifier with waste polyurethane to prepare WP/SBS composite modified asphalt and analyzed its properties and microstructure. Tests showed that WP has potential to be a substitute for SBS in producing composite modified asphalt with good low-temperature resistance.
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.
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