Abstract
In order to address the influence of aging on the performance degradation of SBS-modified asphalt, a composite modification of SBS-modified asphalt by nano-zinc oxide (nano-ZnO) and Trinidad Lake asphalt (TLA) was proposed. Several tests were conducted after adding nano-ZnO and TLA to SBS-modified asphalt, including a rotary film oven test (RTFOT), ultraviolet aging (UV), and the pressure aging vessel test (PAV). The conventional physical index, rheological index, and four-component content of SBS-modified asphalt before and after three aging modes were tested, and the characteristic functional groups in SBS-modified asphalt were tracked and analyzed by Fourier transform infrared spectroscopy (FTIR). The results show that the effects of aging on the rheological properties of SBS-modified asphalt are clearly reduced by adding different proportions of nano-ZnO and TLA in the process of thermal oxygen aging and the ultraviolet aging test, and the antiaging ability of SBS-modified asphalt is clearly improved. To improve the conventional performance and rheological properties of SBS-modified asphalt, an incorporation ratio of 3% nano-ZnO + 25% TLA was proposed. At the same time, the increased rate of heavy components and the change index of the colloidal instability index in the SBS-modified asphalt under the blending ratio were significantly lower than the blank SBS-modified asphalt samples in the same aging mode. FTIR spectra also showed that SBS-modified asphalt performance deterioration were mainly caused by long-term aging and ultraviolet aging. The addition of nano-ZnO and TLA effectively reduced the increase of carbonyl groups and the breakage of the C=C double bond in butadiene and synergistically improved the comprehensive aging resistance of SBS-modified asphalt. Therefore, the use of this modification is an effective method to solve the aging problem of SBS-modified asphalt.
Highlights
Styrene-butadiene-styrene copolymer- (SBS) modified asphalt had been widely used in the pavement industry due to its excellent high temperature performance and low temperature sensitivity [1]
SBS-modified asphalt was selected as the base asphalt, and Trinidad Lake asphalt (TLA) and nano-ZnO were used as modifiers. e specific surface area of nano-ZnO was 50 m2/g, the average particle size was 30 nm, and the purity was greater than 99.5%
During the preparation of the Marshall test piece, in order to reduce the influence of the excessive viscosity of the TLA, the test piece of the asphalt mixture was extended for 10 s, so that the asphalt can better adhere to the aggregate
Summary
Styrene-butadiene-styrene copolymer- (SBS) modified asphalt had been widely used in the pavement industry due to its excellent high temperature performance and low temperature sensitivity [1]. Zhang et al [5] added a variety of inorganic nanoparticles (CaCO3, ZnO, TiO2, and Fe3O4) to the asphalt and studied its high and low temperature and aging properties. It was found that nano-ZnO showed the best antiaging performance and high-temperature performance among various particles. After short-term and long-term aging, nano-silica modified asphalt mixture still had good rutting resistance and fatigue performance. Sun et al [8] added different nanoparticles to the polymer modified asphalt, and the research results found that the modified asphalt mixture containing 0.5% SiO2 + 5% SBR + 1% PE had the best high- and low-temperature performance. Liu et al [9] used different surface
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
