Investigation of the optimal self-healing temperatures and healing time of asphalt binders
Investigation of the optimal self-healing temperatures and healing time of asphalt binders
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沥青结合料最佳自愈合温度和愈合时间的研究
DOI：
10.1016/j.conbuildmat.2016.03.145
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发表时间：
2016-06-15
影响因子：
7.4
通讯作者：
Schlangen, Erik
中科院分区：
文献类型：
--
作者：
Tang, Jin;Liu, Quantao;Schlangen, Erik
本文通过DSR粘度-频率扫描试验研究了沥青结合料的流动行为，寻找其潜在的最佳自愈温度，并通过疲劳-自愈-疲劳试验测定了不同温度下沥青结合料的真实的自愈率，确定了最佳自愈温度。研究了沥青结合料完全愈合所需的愈合时间。结果表明，新老PEN沥青粘结料在软化点温度下均表现出近牛顿流体状态，在软化点温度下沥青粘结料具有最佳的疲劳损伤自愈性能。还发现，粘合剂的老化增加了其最佳自愈合温度。这意味着沥青粘合剂的最佳温度与沥青类型和老化有关。最后，Wool和O的康纳模型可以用来确定沥青结合料达到完全愈合所需的愈合时间，其中累积耗散能恢复被推荐为合适的愈合指标。(C)2016爱思唯尔有限公司版权所有
In this paper, the flow behaviors of asphalt binders were investigated through DSR viscosity-frequency sweep test to find out their potential optimal self-healing temperatures and the real self-healing ratios of the binders at different temperatures were measured through fatigue-healing-fatigue test to confirm the optimal self-healing temperatures. The healing time of asphalt binders needed for full healing was studied as well. It is found that both fresh and aged Pen bitumen binders show near-Newtonian fluid state at their softening point temperatures, at which asphalt binders showed optimal self-healing properties to heal fatigue damage. It is also found that ageing of the binder increases its optimal self-healing temperature. It means that the optimal temperatures of asphalt binders are associated to the bitumen type and ageing. Finally, the Wool and O's Connor model can be used to determine the healing time needed by asphalt binder to achieve full healing, where the accumulated dissipated energy recovery is recommend as a suitable healing index. (C) 2016 Elsevier Ltd. All rights reserved.