To recycle reclaimed asphalt pavement (RAP) derived from porous asphalt (PA) surfacing into a new PA mix, a fundamental understanding of RAP binder properties is needed. In this paper, properties of two PA RAP binders, with and without rejuvenation, were evaluated using quantitative nanomechanical atomic force microscopy (QNM AFM) and performance grading (PG) testing. A model that describes the effect of a bio-rejuvenator on RAP microstructure was developed. A strong correlation was found between the properties measured at nanoscale and macroscale, indicating that the macro properties of RAP binders are driven by the level of polar associations and intermolecular interactions in the bitumen microstructure. This indicates that the microstructures observed in AFM are representative of the bulk properties. Addition of bio-rejuvenator in RAP resulted in the dispersion of polar associations. Finally, it was found that one percent of the rejuvenator can reduce PG critical temperatures by approximately 2 degrees.

要将源自多孔沥青 (PA) 表面的再生沥青路面 (RAP) 回收到新的 PA 混合物中，需要对 RAP 粘合剂性能有基本的了解。在本文中，使用定量纳米机械原子力显微镜 (QNM AFM) 和性能分级 (PG) 测试评估了两种 PA RAP 粘合剂的特性，包括再生和不再生。开发了一个描述生物再生剂对 RAP 微观结构影响的模型。在纳米尺度和宏观尺度测量的特性之间发现了很强的相关性，表明 RAP 粘合剂的宏观特性是由沥青微观结构中的极性缔合和分子间相互作用的水平驱动的。这表明在 AFM 中观察到的微观结构代表了整体特性。在 RAP 中添加生物再生剂导致极性关联的分散。最后，发现百分之一的回春剂可以将 PG 临界温度降低大约 2 度。