Abstract
This laboratory study investigates the use of softwood Kraft lignin as a bitumen additive to reduce its environmental footprint and modify bitumen’s properties. However, the lignin addition in bitumen can lead to some adverse effects, such as increased viscosity. Sasobit® was used to remedy those effects. This study evaluates the separate and synergistic effect of varying concentrations of Kraft lignin and Sasobit on the properties of bitumen. The chemo-thermal and rheological properties of the modified bitumens were investigated using the Fourier-transform infrared spectroscopy (FTIR) technique, thermogravimetric analysis (TGA), and Brookfield rotational viscometer (BRV), dynamic shear rheometer (DSR), multiple stress creep recovery (MSCR) and bending beam rheometer (BBR) tests. FTIR spectra demonstrate that no chemical reactions occur between additives and bitumen. Adding Sasobit increases the thermal stability of lignin-modified bitumen. Sasobit mitigates lignin-modified bitumen's viscosity. The Sasobit-lignin combination enhances bitumen's rutting resistance and viscoelastic properties, but adversely affects the low-temperature performance.
Published Version
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