Abstract
In this paper, kapok fiber (KF) was used as a bio-reinforcement material to modify virgin bitumen, and the rheological properties of the modified bitumen were studied. During the research, the fiber surface was treated utilizing silane coupling agent (KH-550), and the surface microstructure was characterized by scanning electron microscope (SEM). To observe the change of KF on the rheological properties of bitumen, rotational viscosity test, dynamic shear rheometer test, multiple stress creep recovery test, bending beam rheometer test and linear amplitude sweep test were carried out. The results indicated that KH-550 improved fiber surface roughness and strengthened the mutual bonding ability of fiber and asphalt. After adding KF, the viscosity and permanent deformation resistance of bitumen were improved. However, KF had a slight negative effect on the low temperature crack resistance and fatigue resistance in bituminous binder, the effect was relatively less on the premise of no more than 6% fiber content.
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