Journal
COATINGS
Volume 12, Issue 4, Pages -Publisher
MDPI
DOI: 10.3390/coatings12040515
Keywords
graphene quantum dots (GQDs); GQDs; SBS composite-modified asphalt; pavement performances; rheology
Categories
Funding
- Natural Science Fund project in Shandong province [ZR2021ME189]
- Project of science and technology support for youth entrepreneurship in Colleges and universities of Shandong Province [2019KJG004]
Ask authors/readers for more resources
This study successfully prepared GQDs/SBS composite modifier and investigated its effects on asphalt modification. The results showed that GQDs could be evenly dispersed into the SBS phase, enhancing the polarity and improving the high-temperature performance of asphalt.
This study aims to prepare a graphene quantum dots (GQDs)/styrene-butadiene segmented copolymer composite (GQDs/SBS) as an asphalt modifier using the Pickering emulsion polymerization method. The physicochemical properties of the GQDs/SBS modifier and their effects on asphalt modification were investigated. In addition, the GQDs/SBS modifier was compared with the pure SBS modifier. Research results demonstrated that GQDs could be evenly dispersed into the SBS phase to form a uniform composite. Adding GQDs brings more oxygen-containing functional groups into the GQDs/SBS modifier, thus strengthening the polarity and making it disperse into the asphalt better. Compared with the SBS modifier, the GQDs/SBS modifier presents better thermostability. Moreover, GQDs/SBS composite-modified asphalt achieves better high-temperature performance than SBS-modified asphalt, which is manifested by the increased softening points, complex shear modulus and rutting factors. However, the low-temperature performance decreases, which is manifested by reductions in cone penetration, viscosity and ductility as well as the increased ratio between creep stiffness (S) and creep rate (m), that is, S/m. Furthermore, adding GQDs can improve the high-temperature performance of asphalt mixture, but it influences low-temperature and water stability slightly. GQDs/SBS also have the advantages of simple preparation techniques, low cost and are environmentally friendly. Therefore, they have become a beneficial choice as asphalt cementing material modifiers.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available