This paper refines the oxidation kinetics-based approach originally proposed in the NCHRP 09-54 project to determine the laboratory aging durations at 95°C that best reflect the effects of time, climate, and depth on loose asphalt mixtures. Aging durations that match the field aging at various pavement depths were determined in this study for asphalt mixtures, including warm-mix asphalt (WMA), polymer-modified asphalt (PMA), and reclaimed asphalt pavement (RAP). Here, the laboratory aging durations were used to calibrate a climatic aging index to prescribe the laboratory aging duration, given hourly pavement temperature history obtained from Enhanced Integrated Climatic Model analysis of the Modern Era Retrospective-Analysis for Research and Applications, Version 2 weather data. The recalibrated procedure determines the required laboratory aging durations with reasonable accuracy for virgin hot-mix asphalt (HMA) and WMA mixtures. From the recalibrated results, no variations were found with regard to the laboratory aging durations for WMA materials compared with HMA materials, but there were differences between the RAP and non-RAP mixtures. In some instances, the short-term aged RAP mixtures that were prepared according to AASHTO R 30 exceeded the aging level of 4-year-old field cores, suggesting that refinement of this standard short-term aging procedure may be necessary. Approximately half of the PMA sections evaluated exhibited outlier behavior that could have been caused by the unrealistically harsh thermal history of the field projects from which the cores were acquired.

本文完善了最初在NCHRP 09-54项目中提出的基于氧化动力学的方法，以确定在95°C的实验室老化时间，该时间最能反映时间，气候和深度对松散沥青混合料的影响。在这项研究中，确定了与沥青混合料（包括温拌沥青（WMA），聚合物改性沥青（PMA）和再生沥青路面（RAP））在各种路面深度下匹配的老化时间。在这里，实验室老化持续时间用于校准气候老化指数，以规定实验室老化持续时间，其中给出了从现代时代研究与应用回顾性分析的增强型综合气候模型分析（第2版）天气数据中获得的每小时路面温度历史记录。重新校准的程序以合理的精度确定了原始热混合沥青（HMA）和WMA混合物所需的实验室老化时间。从重新校准的结果来看，与HMA材料相比，WMA材料的实验室老化持续时间没有变化，但是RAP和非RAP混合物之间存在差异。在某些情况下，根据AASHTO R 30制备的短期老化RAP混合物超过了4年龄田间岩心的老化水平，这表明可能需要改进此标准的短期老化程序。评估的PMA断面中大约有一半表现出异常行为，这可能是由于从中获取磁芯的现场项目的不现实苛刻的热历史所造成的。