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Effect of asphalt rejuvenating agent on aged reclaimed asphalt pavement and binder properties.

File Language:
English


Details

  • Creators:
    Sabahfar, Nassim ; Hossain, Mustaque
  • Corporate Creators:
    Kansas State University. Transportation Center
  • Corporate Contributors:
    Kansas. Dept. of Transportation. Bureau of Research
  • Subject/TRT Terms:
  • Publication/ Report Number:
    KS-16-12
  • Resource Type:
    Tech Report
  • Geographical Coverage:
    Kansas
  • Corporate Publisher:
    Kansas. Dept. of Transportation. Bureau of Research
  • Abstract:
    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 the 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 performed 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 characteristics ; by assessing critical performance indicators such as stiffness, permanent deformation, moisture susceptibility, and ; cracking resistance. A two-step experimental program was designed that included mechanical property measurements ; of the HIR mixture and rheological properties of the extracted binder. The level of mixing occurring between new and ; aged binder with ARA was also investigated. HIR samples were obtained from three Kansas Department of ; Transportation projects, and Hamburg wheel-tracking device, dynamic modulus, flow number, Texas overlay, thermal ; stress restrained specimen, and moisture susceptibility tests were conducted on mixtures with and without ARA. ; Rheological studies on the extracted binder included dynamic shear rheometer and bending beam rheometer tests. The ; miscibility of new and aged binder was investigated using scanning electron microscope (SEM) images, energy ; dispersive X-ray spectroscopy (EDXS), and the exudation droplet test (EDT). Study results showed significant ; variability in the mechanical performance of HIR mixtures, which was attributed to the variability of binders as ; observed in EDT, SEM, and EDXS studies. ; Life-cycle cost analysis (LCCA) showed that HIR is an economic maintenance alternative for asphalt projects ; in Kansas. LCCA results showed that pavement design strategies with HIR activities will result in alternatives with ; lower net present values when compared to alternatives without HIR maintenance activities.
  • Format:
    PDF
  • Funding:
    C1935
  • Download URL:
    https://rosap.ntl.bts.gov/view/dot/31613/dot_31613_DS1.pdf
  • File Type:
    Filetype[PDF - 3.42 MB]
  • Collection(s):
    US Transportation Collection
  • Main Document Checksum:
    urn:sha256:0bdb9cf815cdbffc6939e5adc8ad63852b98c6e9f72a422826d396739e556880
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