Abstract: In order to study the feasibility of regeneration of aging asphalt by using biological heavy oil, three kinds of heavy bio-oil was selected to carry out the experiment. Physical and chemical properties of three kinds of heavy bio-oil such as specific gravity, viscosity, and moisture content were tested; the elemental analysis and infrared spectrum analysis were undertaken. 70# asphalt under indoor aging simulation experiment was blended with three kinds of heavy bio-oil in the proportion of 2%, 4%, 6% and 8% respectively. The penetration, ductility, softening point and viscosity tests were undertaken to analyze differences of the regeneration effect of three kinds of bio heavy oil on 70# aging asphalt. Besides, the optimal dosage of heavy bio-oil was determined according to the method for the optimum asphalt usage of asphalt mixtures. The results show that: (1) with the increase of bio-oil dosage, there is a downward trend for softening point and viscosity of aging asphalt, while there is a upward trend for penetration and docility of aging asphalt; (2) there are differences among different types of heavy bio-oil in regeneration performance; the regeneration effects of heavy bio-oil A and B are better while the regeneration performance of heavy bio-oil C is slightly worse; (3)the optimum contents of heavy bio-oil A, B and C are 3.9%, 4.6% and 6.4% respectively.

Key words: highway engineering, biological heavy oil, regeneration, aging, physical properties

摘要： 为研究生物重油对老化沥青再生的可行性，选取3种生物重油进行试验。对3种生物重油进行比重、黏度、水分含量、元素分析、红外光谱等理化性能测试；将3种生物重油按照2%、4%、6%、8%的比例掺配至经室内模拟老化后的70#沥青中，通过针入度、延度、软化点、黏度试验，对比分析3种生物重油对70#老化沥青再生效果的差异性；参照沥青混合料最佳沥青用量的方法确定生物重油的最佳掺量。结果表明：随生物重油掺量的增加，老化沥青软化点和黏度呈下降趋势，针入度和延度呈上升趋势；生物重油再生性能存在一定的差异性，生物重油A和B再生性能较好，生物重油C再生性能稍差；生物重油A、B、C最佳掺量分别为3.9%、4.6%、6.4%。

关键词: 道路工程, 生物重油, 再生, 老化, 物理性能