Shear property, high-temperature rheological performance and low-temperature flexibility of asphalt mastics modified with bio-oil
© 2018 Bio-oil is a sustainable and environment-friendly material. The application of bio-oil in paving material, especially into asphalt binder territory, has attracted great attentions. This study focuses on the effect of bio-oil on mechanical and rheological characteristics of asphalt mastic. Bio-oil acting as a modifier was incorporated into asphalt binder by a weight percentage of 15%. Eight types of asphalt mastics were fabricated by means of mixing binder with various amounts of mineral powder filler. The effect of bio-oil on the shear property, high-temperature rheological performance and low-temperature flexibility of asphalt mastics was investigated by the cone penetration test, multiple stress creep recovery test and bending beam test, respectively. The result showed that the critical thermostability temperature of petroleum-based asphalt binder was 1.5 times higher than that of bio-modified asphalt binder. The shear strength of asphalt mastic with and without bio-oil increased with an increase in filler-to-binder ratio. The incorporation of bio-oil enhanced the high temperature stability of asphalt mastic. Asphalt mastic with and without bio-oil exhibited a great anti-deformation potential at high temperature of 64 °C when the filler-to-binder ratio reaches to 1.2. Filler-to-binder ratio had little influence on the corresponding deflection of bio-modified asphalt mastic at −10 °C.
Construction and Building Materials
Shear property, high-temperature rheological performance and low-temperature flexibility of asphalt mastics modified with bio-oil.
Construction and Building Materials,
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