Effect of incorporation of biomimetic Fe3O4-PET and Fe3O4-chitosan-PET fibers on the performance of SBS modified asphalt.

[Display omitted] • Biomimetic Fe 3 O 4 -PET and Fe 3 O 4 -CS-PET fibers were prepared inspired from mussel. • Modified-PET fibers/SBSMA asphalts showed improved viscoelastic properties. • Fe 3 O 4 -CS-PET fiber/SBSMA showed the best mechanical performance. • Enhanced performance of Fe 3 O 4 -CS-PET fiber was due to reactive surface structure. Conventional polyester (PET) fiber with smooth surface and chemical inertness limit the high-temperature rheological properties of styrene–butadienestyrene modified asphalt (SBSMA). Herein, we report the fabrication of biomimetic Fe 3 O 4 -PET modified fiber and Fe 3 O 4 -chitosan(CS)-PET modified fiber via chelation reaction and schiff base reaction, respectively, which are inspired from the interface structure of "mussel scallop shell". Fe 3 O 4 -PET@SBSMA and Fe 3 O 4 -CS-PET@SBSMA exhibited increased the shear by 10.6% and 69.7%, G' (46 °C) by 14.5% and 29.6%, and R (0.1 kPa) by 7.6% and 15.1% respectively with increased flow resistance, viscoelasticity and rutting resistance than that of pristine PET@SBSMA. The increased surface roughness and chemical composition of bionic Fe 3 O 4 -PET and Fe 3 O 4 -CS-PET fibers enhanced the dispersion of polymer in base asphalt, which resulted in boosting the mechanical properties of the fiber incorporated SBSMAs. This study provides a convenient and eco-friendly method for fabricating new bionic fiber functional composites modified asphalt with potential applications in construction and road/highway industries, and provides a scientific theoretical basis for the applications of biomimetic fiber for improving the properties of asphalt based materials. [ABSTRACT FROM AUTHOR]