ABSTRACT
The influence of styrene-butadiene-styrene copolymer (Kraton® D1101) and reactive elastomeric terpolymer (Elvaloy® 4170) on the rheological properties of soft conventional asphalt were investigated. The role of each polymer used for asphalt modification was studied through small-amplitude oscillatory shear, steady-state shear viscosity and multiple stress creep and recovery tests under two constant stress levels; 100 and 3200 Pa. In dynamic experiments, the action of both polymers was clearly manifested at higher temperatures. Steady shear viscosity measured at 50°C showed a peculiar behavior of Kraton® D1101 modified asphalt blends while in asphalt blends with Elvaloy® 4170, a possible reaction between modifier and asphalt was suggested. The outstanding resistance to accumulated deformation was manifested via multiple stress creep and recovery tests in Elvaloy® 4170 asphalt blends.
