In this paper, the organic compounds with aromatic odor in waste peel were extracted by steam distillation in the laboratory, and then were analyzed by techniques of gas chromatography-mass spectrometry. The waste peel extract with different dosages were added to the aged asphalt to produce the recycled asphalt binders. The rheological properties of base asphalt, aged asphalt and recycled asphalt were tested. The results showed that the main chemical compositions of the waste peel extract are light oil which similar to the aromatic component of asphalt. Penetration, softening point, viscosity, complex modulus, phase angle and low temperature stiffness of recycled asphalt can be fully restored to the level of base asphalt with the addition of the waste peel extract. The research of this paper provides a new idea for the treatment of waste peel, and the waste peel extract can be used as a kind of bio-rejuvenator for the recycling of asphalt pavement.
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This work was supported by National Natural Science Fund for Young Scholars of China (grant numbers. 51608411) and the Fundamental Research Funds for the Central Universities of China (WUT: 173101004 and 173201002).
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