The impact of reclaimed asphalt rate on the healing potential of bituminous mortars and mixtures
The impact of reclaimed asphalt rate on the healing potential of bituminous mortars and mixtures
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DOI：
10.1080/10298436.2021.1969020
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发表时间：
2021-09-15
影响因子：
3.8
通讯作者：
Van den Bergh, Wim
中科院分区：
文献类型：
--
作者：
Margaritis, Alexandros;Hasheminejad, Navid;Van den Bergh, Wim
抗疲劳性对沥青材料至关重要，因此它是应用休息时间的效果，因为这是交通负荷的更真实的表示。为此，为了评价愈合潜力，在一系列疲劳测试期间引入了储存休息期。在这项研究中，愈合调查进行的沥青和砂浆规模，旨在评估再生沥青结合料（RAB）的愈合潜力的影响。对于迫击炮，在不同的损伤水平和休息时间下得到的愈合指数被建模成愈合主曲线，描述作为损伤水平和休息时间的函数的愈合指数。沥青试验表明，含有RAB的混合物显示出更高的愈合潜力相比，控制混合物，主要归因于存在的一个较软的混合物，作为部分共混的结果。此外，考虑化学指示剂来评估粘合剂共混物的愈合潜力，并与愈合测试的结果进行比较。对于砂浆，70%RAB样品显示出最低的愈合潜力，反映了当RAB与原始粘合剂完全混合时，非常高的RAB含量的全部效果。
Fatigue resistance is of paramount importance for bituminous materials and so it is the effect of applying rest periods, as this is a more realistic representation of the traffic loading. To this end, to evaluate the healing potential, storage rest periods were introduced during a series of fatigue tests. In this study, the healing investigation was performed on the asphalt and mortar scale, aiming to assess the effect of reclaimed asphalt binder (RAB) on the healing potential. For the mortars, the healing indices derived under different damage levels and rest periods were modelled into a healing master curve, describing the healing index as a function of damage level and rest time. The asphalt tests revealed that the mixtures containing RAB showed higher healing potential compared to the control mix, attributed mainly to the existence of a softer blend as a result of partial blending. Furthermore, chemical indicators were considered to assess the healing potential of the binder blends and compared to the results of the healing tests. For the mortars, the 70% RAB samples showed the lowest healing potential, reflecting the full effect of very high RAB content, when the RAB is fully blended with the virgin binder.