Structural performance of ultra-thin whitetopping on Illinois roadways and parking lots.

Details

• Creators:
  King, Daniel ; Roesler, Jeffery
• Corporate Creators:
  Illinois Center for Transportation
• Corporate Contributors:
  United States. Federal Highway Administration ; Illinois. Dept. of Transportation
• Subject/TRT Terms:
  • Parking lots
  • Roads
  • Whitetopping
  • Thinness
  • Concrete overlays
  • Falling weight deflectometers
  • Pavement distress
  • Condition surveys
  • Deflection
  • Structural tests
• Publication/ Report Number:
  FHWA-ICT-14-018 ; ICT-14-020 ; UILU-ENG-2014-2022
• Resource Type:
  Tech Report
• Geographical Coverage:
  Illinois
• Corporate Publisher:
  Illinois Center for Transportation
• Abstract:
  A performance evaluation of ultra-thin whitetopping (UTW) pavements in Illinois was undertaken in 2012–2014 ; to evaluate current design procedures and to determine design life criteria for future projects. The two main ; components of this evaluation were (1) visual distress surveys of 20 existing UTW projects across the state to ; document and quantify distresses and (2) falling weight deflectometer (FWD) testing of eight of these UTW ; projects to evaluate structural performance. ; The findings of the surveys are detailed in this report. Deflection data collected during FWD testing were used to ; directly calculate load transfer efficiency and assess joint performance, but there was no existing method to ; assess the in situ structural properties of UTW pavements. To better characterize structural performance, a ; backcalculation procedure for UTW pavements was derived and applied to the deflection data obtained from ; FWD testing. The backcalculated effective concrete thickness quantifies the load carrying capacity of the UTW ; pavement, variation of the structural capacity as a function of distance along the roadway, and potentially the ; condition of the concrete–asphalt bond interface and the underlying asphalt concrete layer. ; The findings of the visual distress surveys and the FWD data analysis largely agreed with each other and were ; studied to help provide a greater understanding of factors that affect UTW performance. From this analysis, a ; number of conclusions and recommendations were made regarding UTW pavement design and construction.
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• Format:
  PDF
• Funding:
  R27-061
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/27875/dot_27875_DS1.pdf
• File Type:
  [PDF - 3.27 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:89980b5b08ec1b3b35e9d4dd2638bc1f1683449f353b94fb602310fc8dc8d1ed