Evaluation of thin asphalt overlay practice preserving Nebraska’s asphalt pavements.

Details

• Creators:
  You, Taesun ; Im, Soohyok ; Kim, Yong-Rak ; Haghshenas, Hamzeh ; Nsengiyumva, Gabriel
• Corporate Creators:
  University of Nebraska--Lincoln. Dept. of Civil Engineering
• Corporate Contributors:
  Nebraska. Dept. of Roads ; United States. Federal Highway Administration ; United States. Department of Transportation. Federal Transit Administration
• Subject/TRT Terms:
  • Asphalt pavements
  • Overlays (Pavements)
  • Mechanical properties
  • Laboratory tests
  • Creep tests
  • Dynamic modulus of elasticity
  • Finite element method
  • Pavement performance
  • Life cycle analysis
• Publication/ Report Number:
  SPR-P1(15) M017;26-1121-4022-001
• Resource Type:
  Tech Report
• Geographical Coverage:
  Nebraska
• Corporate Publisher:
  Nebraska Transportation Center ; Mid-America Transportation Center
• Abstract:
  This study examined the current thin asphalt overlay practices implemented in Nebraska. To that end, the mechanical ; properties and performance characteristics of the two mixtures (i.e., SLX and SPH) were compared by carrying out ; laboratory tests such as dynamic modulus test, dynamic creep test, static creep-recovery test, semi-circular bending test, ; and Hamburg wheel tracking test. The laboratory test results were also used to characterize the material properties for ; pavement performance prediction simulation. Structural performance analysis was conducted using the MEPDG and finite ; element method in order to compare the pavement structures with the two different mixtures (i.e., SLX and SPH). In ; addition, a life-cycle cost analysis (LCCA) was performed to compare the economic benefits associated with the thin-lift ; overlay to the conventional overlay practice. This provided insights into how the thin asphalt overlay with the SLX ; mixture behaved compared to the previous practice, which replaced the old asphalt with the SPH mixture. Laboratory ; results clearly showed that the SLX mixture behaved similarly to the SPH mixture in terms of mixture stiffness, rutting ; potential, and cracking resistance. However, the Hamburg wheel tracking test found that the SLX mixture had greater ; moisture susceptibility, a result that requires more investigation. Pavement performance simulation results from finite ; element analysis showed that the rutting and cracking potential of the pavement with SLX thin overlay mixture was lower ; than the pavement with SPH mixture. MEPDG simulations predicted that both pavements would perform satisfactorily ; during their expected design life, but the LCCA indicated that the practice of using the thin SLX preservation technique ; can reduce both the agency’s and user’s costs compared to the conventional SPH rehabilitation practice. Both ; performance prediction results need to be compared to actual field performance data. Only one-year field performance is ; available to date, which needs to be continuously monitored to judge how both pavement structures perform.
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• Format:
  PDF
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/29200/dot_29200_DS1.pdf
• File Type:
  [PDF - 11.56 MB]
• Collection(s):
  University Transportation Centers ; US Transportation Collection
• Main Document Checksum:
  urn:sha-512:6ea8c9b316d47f1f19c169a05e9723db3c8095443167b3b413bdbd43a53cc42adfbeb2e8929066a6c8e12d952619ced238861981894e20b142e8102eb3361ac2