Highly modified asphalt (>6.0 wt% styrene butadiene styrene copolymer, SBS) has been extensively used for extending the durability of porous asphalt (PA) pavement. In depth knowledge of the in-field aging of different PA layers is needed because the natural aging of PA possessing around 20% voids content severely affects its properties. The field core samples were taken from sections of the Shanghai Highway which had aged 6 years and 9 years outdoors. The recovered modified binders from different layers (top, middle and bottom) of the PA were evaluated by chemical and rheological characterization. After undergoing outdoors aging, chemical characterization showed that the carbonyl and sulfoxide content of the modified binders had increased for the top layers. The intensities of peaks for bottom layers were lower, demonstrating that the top part of the PA was more exposure to real weather aging. Aging in the degradation of SBS, evaporation of lighter components, oxidation and condensation of the asphalt produces variations in the rheological properties of the recovered binders. Rheological characterization revealed that the highly modified binders continue to perform well even after 6 years and 9 years of outdoor aging.

高度改性的沥青（> 6.0 wt％的苯乙烯丁二烯苯乙烯共聚物，SBS）已被广泛用于延长多孔沥青（PA）路面的耐久性。需要深入了解不同PA层的场内老化，因为拥有约20％空隙含量的PA的自然老化会严重影响其性能。现场岩心样本取自上海高速公路6年和9年室外的路段。通过化学和流变学特性评估了从PA的不同层（顶部，中间和底部）回收的改性粘合剂。在经历户外老化之后，化学表征显示改性粘合剂的羰基和亚砜含量对于顶层已经增加。底层的峰强度较低，证明功率放大器的顶部更容易受到实际天气老化的影响。SBS降解的老化，较轻组分的蒸发，沥青的氧化和凝结会导致回收粘合剂的流变性能发生变化。流变学特征表明，即使经过6年和9年的室外老化，高改性的粘结剂仍能保持良好的性能。