Characterizing the chemical and rheological properties of severely aged reclaimed asphalt pavement materials with high recycling rate

Shih Hsien Yang, Li Chun Lee

研究成果: Article同行評審

38 引文 斯高帕斯(Scopus)

摘要

Frequent mill and overlay activities result in the production of a considerable amount of reclaimed asphalt pavement (RAP) materials. Many pavements that incorporated RAP exhibit a shorter service life than do those without RAP. One of the possible reasons is that certain RAP materials have already undergone multiple recycling processes during the past decade. This results in severe aging of the reclaimed asphalt binder (RAB). In this study, three severely aged RABs, two RAP blending scenarios, two virgin binders, and two commercial rejuvenators were used to investigate the feasibility of using severely aged binders for constructing pavements. The chemical and rheological properties of the rejuvenated severely aged binders were evaluated using high-performance gel permeation chromatography and a dynamic shear rheometer. The molecular size distributions of rejuvenated RABs revealed that the rejuvenators used in this study could rebalance the proportions of large, medium, and small molecular components among the rejuvenated RABs. However, the polydispersity values still enabled clearly distinguishing between virgin binders and rejuvenated RABs. Two performance parameters were used to evaluate the potential of age-induced damage as well as permanent rutting in the binders. A Glover-Rowe damage zone was evaluated, and it revealed promising results to distinguish among severely aged binders, virgin binders, and rejuvenated binders. Oscillation and multiple stress creep and recovery tests were performed to obtain rutting potential parameter G/sin(δ) and Jnr, respectively. The results indicated that all rejuvenated aged binders exhibited higher G/sin(δ) values and lower Jnr values compared with the control virgin binders.

原文English
頁(從 - 到)139-146
頁數8
期刊Construction and Building Materials
111
DOIs
出版狀態Published - 2016 5月 15

All Science Journal Classification (ASJC) codes

  • 土木與結構工程
  • 建築與營造
  • 一般材料科學

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