AH-70 asphalts were obtained using FCC slurry with heavy crude oil from South America as the feedstock through true boiling point distillation instrument.The thin film oven test (TFOT) and pressure aging vessel (PAV) were applied to simulate the short-term and long-term aging of asphalt respectively,through which the effect and mechanism of FCC slurry on the two anti-aging processes were investigated.It is found that AH-70 asphalts can be produced from the blending of heavy oil and FCC slurry (0％,3％,6％,9％,and 12％ by weight of heavy oil,respectively) at the final boiling point of 425,430,430,430,and 435 ℃ accordingly.With the increase of the blending ratio for FCC slurry,the retained penetration and ductility at 15 ℃ of the TFOT aged asphalts are reduced.Meanwhile,the growth rate of softening point is increased.After PAV aging,the retained penetration is declined and the growth rate of softening point is also improved.And there is no significant oxidation reaction of functional groups during the TFOT aging process.As the increase of FCC slurry,the volatilization of light components and the condensation of aromatics/resins are the main reasons of deteriorating the TFOT aging performance of asphalt.After PAV aging,the sulfoxide and carboxyl groups are formed in the asphalt.Also,it is found that the aromatics in FCC slurry can inhibit the free radical reaction in the aging process of asphalt.However,the condensation of aromatics and resins still damages the PAV anti-aging property.%南美重油中掺加油浆后,通过实沸点蒸馏制备AH-70沥青;分别采用薄膜烘箱实验法(TFOT)和加速老化实验法(PAV)模拟沥青的短期和长期老化,考察不同的油浆掺量对沥青短期和长期抗老化性的影响,并对老化机制进行研究.结果表明:南美重油掺加0％、3％、6％、9％和12％油浆后分别切割到425、430、430、430、435℃可得到AH-70沥青;随着油浆掺加比例的增大,经短期老化后沥青的残留针入度比、15℃残留延度降低,软化点升高率增大;沥青经过长期老化后,残留针入度比降低、软化点升高率增大;沥青在短期老化中没有发生明显的官能团氧化反应,随掺加油浆比例的增大,沥青中轻组分的挥发和芳香分、胶质的缩合加剧是导致沥青短期抗老化性逐渐变差的原因;沥青经长期老化后,发生氧化生成亚砜和羰基官能团,油浆中的芳烃化合物可有效地抑制沥青氧化反应中的自由基反应,但芳香分、胶质的缩合加剧仍导致沥青长期抗老化性逐渐变差.
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