Properties of asphalt binder modified by corn stalk fiber

The properties of asphalt binder modified with corn stalk fiber were investigated in this study. The physical-mechanical behaviors of the fiber modified asphalt binder were studied by the penetration and softening point tests, dynamic shear test, bending beam rheometer test and rotational viscosity test. The results indicate that the addition of corn stalk fiber decreases the penetration and increases the softening point of the asphalt binder. Furthermore, the addition of the corn stalk fiber increases the complex modulus and decreases the phase angle of the asphalt. The creep stiffness of the asphalt binder at low temperatures first decreases and then increases with an increase in corn stalk fiber content. The variation of the m-value of the asphalt binder is the opposite to which of the creep stiffness. The corn stalk fiber has good uniformity in the asphalt binder, followed by basalt fiber and finally lignin fiber. The viscosity results indicate that the addition of corn stalk fiber can increase the viscosity of the asphalt binder, and the temperature sensitivity of the asphalt binder decreases.