为了研究短期老化对胶粉改性沥青高温性能的影响，采用薄膜烘箱试验（TFOT）对胶粉改性沥青进行老化，通过动态剪切流变试验（DSR）、重复蠕变恢复试验（RCRT），从流变性角度分析了不同老化因素对胶粉改性沥青性能的影响，并结合扫描电镜（SEM）从微观层面对沥青及胶粉老化前后的表观形貌进行分析。结果表明，老化作用使得胶粉改性沥青G^*提高、tan δ减小、沥青的高温抗变形能力提高，而老化温度与老化时间的提高则促进了沥青老化程度的加深；老化过程中胶粉仍存在强烈的溶胀与降解反应，两种作用共同促进了胶粉改性沥青的180℃特殊流变性；老化作用使得胶粉改性沥青（ε_P/ε_L）减小、沥青变形恢复能力提高，相比于老化温度，老化时间对胶粉改性沥青变形恢复能力的影响更为显著；沥青中的胶粉受老化影响较小，从而使沥青保持较好的弹性。

To find out the effect of short-term aging on the high-temperature properties of crumb rubber modified asphalt (CRMA), a series of lab tests including dynamic shear rheological test (DSR) and repeated creep recovery test (RCRT) are performed to study the effects of different aging factors on the properties of CRMA that is aged in a thin film oven test (TFOT).The morphology changes of asphalt and rubber powder before and after aging are analyzed from the microscopic level by means of SEM.The results show that the aging action increases G^* of CRMA, causes CRMA's tan δ to decrease and helps asphalt to improve deformation resistance at high temperature.Both the increases of aging temperature and the extending of aging time can promote the aging degree of asphalt.There is still strong swelling and degradation reactions for rubber powder during the aging process, both reactions promote the special rheological properties of CRMA at 180℃.CRMA's recovery ability is improved after aging.Compared with the aging temperature, the aging time has a more significant effect on the deformation and recovery ability of CRMA.Rubber powder within asphalt is less affected by aging, which therefore gives asphalt good elasticity.

张智豪(1993-),男,硕士研究生,从事道路建筑材料的研究,598016717@qq.com。