沥青路面RAP料降级衰变与沥青衰减规律研究

Research on Downgrade Decay and Asphalt Decay in the RAP of Asphalt Pavement

摘要: 在进行再生沥青混合料设计时，RAP料性能的准确把握是关键。文章深入分析了RAP料降级衰变与旧沥青老化衰减机理和规律，具有重要的理论和现实意义。分析数据表明：RAP料抽提后级配发生降级衰变，且粒径越大降级越明显；RAP料中旧沥青的胶体结构已经发生改变，稳定性减弱，沥青性能变差，主要表现为延度变差，软化点升高，针入度降低，利用热分析手段DSC和红外光谱IR技术检测证明了沥青的老化状态。

Abstract: In the design of recycled asphalt mixture, the key is to accurately grasp the performance of re-claimed asphalt pavement (RAP). The mechanism and regularity of aging of old asphalt and downgrade decay of RAP are deeply analyzed, which has important theoretical and practical sig-nificance. The analysis data show that the gradation of RAP occurs downgrade decay after extraction, and the larger the particle size, the more obvious the downgrade is; the colloidal structure of old asphalt in RAP has changed, the stability has weakened, and the performance of asphalt has deteriorated. The main manifestations are worse ductility, higher softening point and lower pen-etration. The aging state of asphalt has been proved by DSC and IR.