Furthermore, in terms of flow behavior, the SBS-modified
asphalt with 30 wt.% styrene content shows the highest viscosity in the
low shear rates zone, followed by samples containing 20 wt.% and
40 wt.% styrene. However, it is less susceptible to shear forces for asphalt
as the increase of styrene because larger and stronger aggregated
polystyrene domains make the movement more difficult and more
force is needed.