Study of Aging Asphalt Recovery Using Peanut Oil Residue as a Biomass Regenerator

The properties of reclaimed asphalt were studied using peanut oil residue (POR) as a regenerant. The preparation, chemical composition, and rheological properties of POR regenerant were studied. GC-MS and FITR studies of the chemical composition of reclaimed asphalt found that there was a large amount of light oil in POR. After the addition of bio-oil, the functional group index of the aged asphalt showed a downward trend, indicating that it can effectively adjust the asphalt components. The rheological properties of 90# asphalt after pressure aging vessel (PAV) aging were tested by adding 3%, 6%, 9%, 12%, and 15% POR regenerator. In the aspect of low-temperature performance, with the increase in bio-oil content the m-value continued to increase and the S value continued to decrease. When the content of POR was in the range of 3%–6%, the performance index of the asphalt after aging and regeneration reached the level of the matrix asphalt. When the temperature dropped to −22°C, the low-temperature performance index of the asphalt decreased as the content of POR regenerant was slightly increased. In terms of high-temperature performance, the use of POR as a regenerant can alleviate the declining trend in the fatigue durability curve of the complex modulus of recycled asphalt, in which 9% POR can effectively restore fatigue resistance.