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Effect of Asphalt Rejuvenating Agent on Cracking Properties of Aged Reclaimed Asphalt Pavement

机译:沥青再生剂对老化再生沥青路面抗裂性能的影响

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Hot in-place recycling (HIR) preserves distressed asphalt pavements while minimizing use of virgin binder and aggregates. The final quality of an HIR mixture depends on characteristics of the original binder, aging of the pavement surface during service, and whether or not new binder or rejuvenator was added to the mixture. An HIR mixture should maintain desired properties for additional service periods, making asphalt binder modification inevitable. Asphalt binder modifications in HIR are commonly done by adding an asphalt rejuvenating agent (ARA). However, ARA may adversely affect the qualities of new HIR and potentially fail to improve the quality of the final surface. The objective of this research was to investigate the effects of rejuvenation on HIR performance by assessing critical performance indicators such as cracking resistance, moisture susceptibility, and low temperature cracking. An experimental program was designed that included mechanical property measurements of the HIR mixture by conducting Texas overlay, thermal stress restrained specimen, and moisture susceptibility tests. HIR Samples were obtained from three Kansas Department of Transportation projects and tests were conducted on HIR mixtures with and without ARA. Study results showed significant variability in the mechanical performance of HIR mixtures, which was attributed to the variability of binders.
机译:就地热回收(HIR)可以保护受损的沥青路面,同时最大程度地减少原始粘结剂和集料的使用。 HIR混合物的最终质量取决于原始粘合剂的特性,维修期间路面的老化情况以及是否向混合物中添加了新的粘合剂或再生剂。 HIR混合物应在其他使用期限内保持理想的性能,从而不可避免地要改性沥青粘合剂。通常通过添加沥青再生剂(ARA)对HIR中的沥青粘合剂进行改性。但是,ARA可能会对新的HIR的质量产生不利影响,并且可能无法改善最终表面的质量。这项研究的目的是通过评估关键性能指标(例如抗裂性,湿气敏感性和低温裂化)来研究复兴对HIR性能的影响。设计了一个实验程序,其中包括通过进行德克萨斯州覆盖,热应力约束试样和湿气敏感性测试对HIR混合物进行机械性能测量。 HIR样品是从堪萨斯州交通运输部的三个项目中获得的,并对有无ARA的HIR混合物进行了测试。研究结果表明,HIR混合物的机械性能存在显着差异,这归因于粘合剂的差异。

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