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RAP and the Aging of Asphalt Concrete

机译：RAP与沥青混凝土的老化

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The primary reason for limited use of reclaimed asphalt pavement (RAP) is the uncertainty of the long-term pavement performance. Understanding the response of virgin material and RAP material to oxidative aging is important to the selection of virgin and RAP binder. Five different percentages (0%, 15%, 25%, 35% and 40%) of RAP included asphalt concrete (AC) were designed to compare the effects of aging on hot mix asphalt (HMA). To assess the effect of aging on AC, the samples were subjected to oven aging following AASHTO R30 protocol. Successive aging the samples were conducted to quantify which RAP percentage is more susceptible to long-term aging. Dynamic modulus tests were conducted on control and aged AC samples. Results show aging of the material increases the complex modulus of all the samples irrespective of RAP percentages. The master curves indicates that as more RAP is added to the mixes, the curves shift upwards at the high frequency and a slight upward shift at the low frequency end of the curve.
机译：限制使用再生沥青路面（RAP）的主要原因是长期路面性能的不确定性。了解原始材料和RAP材料对氧化老化的响应对于选择原始材料和RAP粘合剂非常重要。设计了五种不同百分比（0％，15％，25％，35％和40％）的RAP沥青混凝土（AC），以比较老化对热拌沥青（HMA）的影响。为了评估老化对AC的影响，按照AASHTO R30规程对样品进行烤箱老化。对样品进行连续老化，以量化哪个RAP百分比更容易受到长期老化的影响。动态模量测试是在对照和老化的交流样品上进行的。结果表明，不管RAP百分比如何，材料的老化都会增加所有样品的复数模量。主曲线表明，随着向混合物中添加更多的RAP，曲线在高频处向上移动，在低频端稍微向上移动。

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