Preparation and Performance Analysis of Bio-asphalt from Liquefaction and Resinification of Straw.

Waste wood, crop residues, livestock manure and waste oil, were widely used to produce bio-oil. And then partially or completely replace the petroleum-based asphalt. But the road performance of this asphalt was insufficient. In this study, the development of green and sustainable bio-asphalt to partially replace petroleum-based asphalt with wood-based phenolic resin made by straw liquefaction products was proposed. Firstly, the separation of straw components was carried out to extract cellulose and lignin. Straw and its primary components were liquefied to explore the main factors influencing the liquefaction of straw. Then the liquefied products were combined with formaldehyde to synthesize lignin-based phenolic resin WPR. And the phenolic resin PR, which was obtained from the reaction with phenol, was compared and analyzed. Finally, the resin was put into matrix asphalt with different ratios to prepare bio-asphalt, and the performance of the bio-asphalt was analyzed by the three major indexes of each bio-asphalt and viscosity. The results showed that the liquefaction rate of straw mainly depended on the liquefaction rate of cellulose, and its liquefaction reaction was complex, with a reaction kinetic level of 1. 71. From the resin yield and liquefaction products, WPR, PR FT-IR spectral analysis showed that the WPR resin synthesis rate was higher and had a better reactivity than the PR. Only when mixed with the liquefaction products, the performance of the bio-asphalt prepared was poorer. However, when mixed with WPR resin, the bio-asphalt's high temperature stability, low-temperature cracking resistance, deformation resistance, and temperature stability were better than matrix asphalt [ABSTRACT FROM AUTHOR]