Engineering characterization of recycled asphalt concrete and aged bitumen mixed recycling agent

J. S. Chen, C. C. Huang, P. Y. Chu, K. Y. Lin

Research output: Contribution to journalArticle

43 Citations (Scopus)

Abstract

A recycling agent is commonly used to restore the aged bitumen to a condition that resembles that of the virgin bitumen. Three reclaimed asphalt pavement (RAP) stockpiles were sampled, and the aged binders recovered from RAP binders were mixed with recycling agents at ten levels to produce bitumen blends. The blends using virgin bitumen as the softening agent exhibited a significantly different rheological behavior from ones using the rejuvenating agent. The addition of a recycling agent could shift up or down the master curve of the blend vertically, depending on the engineering properties of the recycling agent. A normalized viscosity ratio (NVR) model was used to characterize the rheological properties of aged bitumen mixed with softening and rejuvenating agents. An interaction parameter was introduced into the model to consider the physico-chemical reaction between aged bitumen and recycling agent. This mixing rule was compared to the method specified in the blending chart by the Asphalt Institute (AI). The blending chart was shown to be applicable to determine the amount of the softening agent required to meet the target viscosity. The NVR model appeared to be a better tool for the rejuvenating agent to predict the viscosity of a recovered bitumen blend than the AI chart.

Original languageEnglish
Pages (from-to)9867-9876
Number of pages10
JournalJournal of Materials Science
Volume42
Issue number23
DOIs
Publication statusPublished - 2007 Dec 1

Fingerprint

asphalt
Asphalt concrete
Recycling
Viscosity
Asphalt pavements
Asphalt
Binders

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Chen, J. S. ; Huang, C. C. ; Chu, P. Y. ; Lin, K. Y. / Engineering characterization of recycled asphalt concrete and aged bitumen mixed recycling agent. In: Journal of Materials Science. 2007 ; Vol. 42, No. 23. pp. 9867-9876.
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Engineering characterization of recycled asphalt concrete and aged bitumen mixed recycling agent. / Chen, J. S.; Huang, C. C.; Chu, P. Y.; Lin, K. Y.

In: Journal of Materials Science, Vol. 42, No. 23, 01.12.2007, p. 9867-9876.

Research output: Contribution to journalArticle

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