Rheological and aging characteristics of the recycled asphalt binders with different rejuvenator incorporation methods
Rheological and aging characteristics of the recycled asphalt binders with different rejuvenator incorporation methods
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DOI：
10.1016/j.jclepro.2020.121249
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发表时间：
2020-07-20
影响因子：
11.1
通讯作者：
Huang, Baoshan
中科院分区：
文献类型：
--
作者：
Ma, Yuetan;Hu, Wei;Huang, Baoshan
随着人们对可持续发展意识的不断提高，近年来，再生沥青路面(RAP)和再生沥青瓦片(RAS)在沥青路面中的应用越来越普遍。为了恢复老化粘结剂的流变性和其他性能，在生产含有RAP和/或RAS的沥青混合料时通常使用再生剂。传统的返老剂掺入方法是先将返老剂与原始粘结剂混合，然后与其他回收材料混合。本文介绍了一种不同再生剂应用程序的沥青结合料室内试验研究，即先将再生剂与再生材料混合，然后再与原始结合料掺入。通过动态剪切流变仪(DSR)和凝胶渗透色谱(GPC)试验，分析了不同工艺条件下沥青结合料的流变性和老化性能。与传统方法相比，首先将再生剂与回收材料混合的方法在混合过程中显著改善了粘结剂共混物的工作性。新方法使沥青混合料的流变性有所不同，短期老化对沥青结合料的老化影响较小。然而，对于长期老化，两种掺入方法对粘结剂共混物的老化效果相似。(C)2020爱思唯尔有限公司。保留所有权利。
With the ever-increasing awareness for sustainability, the utilization of reclaimed asphalt pavement (RAP) and recycled asphalt shingles (RAS) in asphalt paving has become more and more popular in recent years. To restore the rheological and other properties of aged binders, rejuvenators are commonly used during the asphalt mixtures production containing RAP and/or RAS. The conventional rejuvenation incorporation method is to blend the rejuvenators with virgin binder first, followed by mixing with other recycled materials. This paper presents a laboratory study on asphalt binder with a different rejuvenator application procedure, which blends the rejuvenators with the recycled materials first and then incorporates the blends with the virgin binder afterwards. Rheological and aging properties of asphalt binders blended with different procedures were analyzed through the dynamic shear rheometer (DSR) test and gel permeation chromatography (GPC) tests. Compared to the conventional method, it was revealed that the method by blending the rejuvenators with the recycled materials first significantly improved the workability of the binder blends during mixing. The new method resulted in a different rheological property and caused less aging effect for the asphalt binder blends in the short-term aging. However, for the long-term aging, the two incorporation methods exhibited similar aging effects on the binder blends. (C) 2020 Elsevier Ltd. All rights reserved.